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Fix x86, x86_64 fmax, fmin sNaN handling, add tests (bug 20947).
Various fmax and fmin function implementations mishandle sNaN arguments: (a) When both arguments are NaNs, the return value should be a qNaN, but sometimes it is an sNaN if at least one argument is an sNaN. (b) Under TS 18661-1 semantics, if either argument is an sNaN then the result should be a qNaN (whereas if one argument is a qNaN and the other is not a NaN, the result should be the non-NaN argument). Various implementations treat sNaNs like qNaNs here. This patch fixes the x86 and x86_64 versions (ignoring float and double for 32-bit x86 given the inability to reliably avoid the sNaN turning into a qNaN before it gets to the called function). Tests of sNaN inputs to these functions are added. Note on architecture versions I haven't changed for this issue: AArch64 already gets this right (it uses a hardware instruction with the correct semantics for both quiet and signaling NaNs) and does not need changes. It's possible Alpha, IA64, SPARC might need changes (this would be shown by the testsuite if so). Tested for x86_64 and x86 (both i686 and i586 builds, to cover the different x86 implementations). [BZ #20947] * sysdeps/i386/fpu/s_fmaxl.S (__fmaxl): Add the arguments when either is a signaling NaN. * sysdeps/i386/fpu/s_fminl.S (__fminl): Likewise. Make code follow fmaxl more closely. * sysdeps/i386/i686/fpu/s_fmaxl.S (__fmaxl): Add the arguments when either is a signaling NaN. * sysdeps/i386/i686/fpu/s_fminl.S (__fminl): Likewise. * sysdeps/x86_64/fpu/s_fmax.S (__fmax): Likewise. * sysdeps/x86_64/fpu/s_fmaxf.S (__fmaxf): Likewise. * sysdeps/x86_64/fpu/s_fmaxl.S (__fmaxl): Likewise. * sysdeps/x86_64/fpu/s_fmin.S (__fmin): Likewise. * sysdeps/x86_64/fpu/s_fminf.S (__fminf): Likewise. * sysdeps/x86_64/fpu/s_fminl.S (__fminl): Likewise. * math/libm-test.inc (fmax_test_data): Add tests of sNaN inputs. (fmin_test_data): Likewise.
This commit is contained in:
Joseph Myers
parent
67f779f1ea
commit
0a2546cdaa
19
ChangeLog
19
ChangeLog
@ -1,3 +1,22 @@
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2016-12-15 Joseph Myers <joseph@codesourcery.com>
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[BZ #20947]
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* sysdeps/i386/fpu/s_fmaxl.S (__fmaxl): Add the arguments when
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either is a signaling NaN.
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* sysdeps/i386/fpu/s_fminl.S (__fminl): Likewise. Make code
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follow fmaxl more closely.
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* sysdeps/i386/i686/fpu/s_fmaxl.S (__fmaxl): Add the arguments
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when either is a signaling NaN.
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* sysdeps/i386/i686/fpu/s_fminl.S (__fminl): Likewise.
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* sysdeps/x86_64/fpu/s_fmax.S (__fmax): Likewise.
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* sysdeps/x86_64/fpu/s_fmaxf.S (__fmaxf): Likewise.
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* sysdeps/x86_64/fpu/s_fmaxl.S (__fmaxl): Likewise.
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* sysdeps/x86_64/fpu/s_fmin.S (__fmin): Likewise.
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* sysdeps/x86_64/fpu/s_fminf.S (__fminf): Likewise.
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* sysdeps/x86_64/fpu/s_fminl.S (__fminl): Likewise.
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* math/libm-test.inc (fmax_test_data): Add tests of sNaN inputs.
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(fmin_test_data): Likewise.
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2016-12-15 Andreas Schwab <schwab@suse.de>
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* support/support_test_main.c (support_test_main): Don't shadow
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@ -7799,6 +7799,14 @@ static const struct test_ff_f_data fmax_test_data[] =
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TEST_ff_f (fmax, 9, -qnan_value, 9, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, -9, qnan_value, -9, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, -9, -qnan_value, -9, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, 0, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, 0, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, minus_zero, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, minus_zero, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, 9, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, 9, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, -9, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, -9, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, qnan_value, 0, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, -qnan_value, 0, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, qnan_value, minus_zero, minus_zero, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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@ -7807,18 +7815,46 @@ static const struct test_ff_f_data fmax_test_data[] =
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TEST_ff_f (fmax, -qnan_value, 9, 9, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, qnan_value, -9, -9, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, -qnan_value, -9, -9, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, snan_value, 0, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, -snan_value, 0, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, snan_value, minus_zero, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, -snan_value, minus_zero, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, snan_value, 9, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, -snan_value, 9, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, snan_value, -9, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, -snan_value, -9, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, plus_infty, qnan_value, plus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, plus_infty, -qnan_value, plus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, minus_infty, qnan_value, minus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, minus_infty, -qnan_value, minus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, plus_infty, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, plus_infty, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, minus_infty, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, minus_infty, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, qnan_value, plus_infty, plus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, -qnan_value, plus_infty, plus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, qnan_value, minus_infty, minus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, -qnan_value, minus_infty, minus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, snan_value, plus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, -snan_value, plus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, snan_value, minus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, -snan_value, minus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, qnan_value, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, qnan_value, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, -qnan_value, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, -qnan_value, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmax, qnan_value, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, qnan_value, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, -qnan_value, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, -qnan_value, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, snan_value, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, snan_value, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, -snan_value, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, -snan_value, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, snan_value, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, snan_value, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, -snan_value, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmax, -snan_value, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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};
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static void
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@ -7862,6 +7898,14 @@ static const struct test_ff_f_data fmin_test_data[] =
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TEST_ff_f (fmin, 9, -qnan_value, 9, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, -9, qnan_value, -9, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, -9, -qnan_value, -9, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, 0, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, 0, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, minus_zero, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, minus_zero, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, 9, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, 9, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, -9, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, -9, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, qnan_value, 0, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, -qnan_value, 0, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, qnan_value, minus_zero, minus_zero, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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@ -7870,18 +7914,46 @@ static const struct test_ff_f_data fmin_test_data[] =
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TEST_ff_f (fmin, -qnan_value, 9, 9, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, qnan_value, -9, -9, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, -qnan_value, -9, -9, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, snan_value, 0, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, -snan_value, 0, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, snan_value, minus_zero, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, -snan_value, minus_zero, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, snan_value, 9, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, -snan_value, 9, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, snan_value, -9, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, -snan_value, -9, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, plus_infty, qnan_value, plus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, plus_infty, -qnan_value, plus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, minus_infty, qnan_value, minus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, minus_infty, -qnan_value, minus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, plus_infty, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, plus_infty, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, minus_infty, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, minus_infty, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, qnan_value, plus_infty, plus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, -qnan_value, plus_infty, plus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, qnan_value, minus_infty, minus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, -qnan_value, minus_infty, minus_infty, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, snan_value, plus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, -snan_value, plus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, snan_value, minus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, -snan_value, minus_infty, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, qnan_value, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, qnan_value, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, -qnan_value, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, -qnan_value, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_ff_f (fmin, qnan_value, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, qnan_value, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, -qnan_value, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, -qnan_value, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, snan_value, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, snan_value, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, -snan_value, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, -snan_value, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, snan_value, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, snan_value, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, -snan_value, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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TEST_ff_f (fmin, -snan_value, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
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};
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static void
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@ -28,7 +28,13 @@ ENTRY(__fmaxl)
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andb $0x45, %ah
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cmpb $0x01, %ah
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je 1f // y == NaN
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je 2f // y == NaN
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fxam
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fnstsw
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andb $0x45, %ah
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cmpb $0x01, %ah
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je 3f // x == NaN
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fucom %st(1)
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fnstsw
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@ -39,5 +45,27 @@ ENTRY(__fmaxl)
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1: fstp %st(1)
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ret
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2: // st(1) is a NaN; st(0) may or may not be.
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fxam
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fnstsw
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andb $0x45, %ah
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cmpb $0x01, %ah
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je 4f
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// st(1) is a NaN; st(0) is not. Test if st(1) is signaling.
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testb $0x40, 23(%esp)
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jz 4f
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fstp %st(1)
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ret
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3: // st(0) is a NaN; st(1) is not. Test if st(0) is signaling.
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testb $0x40, 11(%esp)
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jz 4f
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fstp %st(0)
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ret
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4: // Both arguments are NaNs, or one is a signaling NaN.
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faddp
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ret
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END(__fmaxl)
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weak_alias (__fmaxl, fmaxl)
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@ -21,23 +21,51 @@
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.text
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ENTRY(__fminl)
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fldt 4(%esp) // x
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fldt 16(%esp) // x : y
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fldt 16(%esp) // y
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fxam
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fnstsw
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fldt 4(%esp) // y : x
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andb $0x45, %ah
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cmpb $0x01, %ah
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je 2f // y == NaN
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fxam
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fnstsw
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andb $0x45, %ah
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cmpb $0x01, %ah
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je 1f // y == NaN
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je 3f // x == NaN
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fucom %st(1)
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fnstsw
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sahf
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jc 2f
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jc 1f
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1: fxch %st(1)
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2: fstp %st(1)
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fxch %st(1)
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1: fstp %st(1)
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ret
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2: // st(1) is a NaN; st(0) may or may not be.
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fxam
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fnstsw
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andb $0x45, %ah
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cmpb $0x01, %ah
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je 4f
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// st(1) is a NaN; st(0) is not. Test if st(1) is signaling.
|
||||
testb $0x40, 23(%esp)
|
||||
jz 4f
|
||||
fstp %st(1)
|
||||
ret
|
||||
|
||||
3: // st(0) is a NaN; st(1) is not. Test if st(0) is signaling.
|
||||
testb $0x40, 11(%esp)
|
||||
jz 4f
|
||||
fstp %st(0)
|
||||
ret
|
||||
|
||||
4: // Both arguments are NaNs, or one is a signaling NaN.
|
||||
faddp
|
||||
ret
|
||||
END(__fminl)
|
||||
weak_alias (__fminl, fminl)
|
||||
|
||||
@ -24,16 +24,35 @@ ENTRY(__fmaxl)
|
||||
fldt 4(%esp) // x
|
||||
fldt 16(%esp) // x : y
|
||||
|
||||
fucomi %st(0), %st
|
||||
fcmovu %st(1), %st // now %st contains y if not NaN, x otherwise
|
||||
|
||||
fxch
|
||||
|
||||
fucomi %st(1), %st
|
||||
jp 2f
|
||||
fcmovb %st(1), %st
|
||||
|
||||
fstp %st(1)
|
||||
|
||||
ret
|
||||
|
||||
2: // Unordered.
|
||||
fucomi %st(0), %st
|
||||
jp 3f
|
||||
// st(1) is a NaN; st(0) is not. Test if st(1) is signaling.
|
||||
testb $0x40, 11(%esp)
|
||||
jz 4f
|
||||
fstp %st(1)
|
||||
ret
|
||||
|
||||
3: // st(0) is a NaN; st(1) may or may not be.
|
||||
fxch
|
||||
fucomi %st(0), %st
|
||||
jp 4f
|
||||
// st(1) is a NaN; st(0) is not. Test if st(1) is signaling.
|
||||
testb $0x40, 23(%esp)
|
||||
jz 4f
|
||||
fstp %st(1)
|
||||
ret
|
||||
|
||||
4: // Both arguments are NaNs, or one is a signaling NaN.
|
||||
faddp
|
||||
ret
|
||||
END(__fmaxl)
|
||||
weak_alias (__fmaxl, fmaxl)
|
||||
|
||||
@ -24,14 +24,35 @@ ENTRY(__fminl)
|
||||
fldt 4(%esp) // x
|
||||
fldt 16(%esp) // x : y
|
||||
|
||||
fucomi %st(0), %st
|
||||
fcmovu %st(1), %st // now %st contains y if not NaN, x otherwise
|
||||
|
||||
fucomi %st(1), %st
|
||||
jp 2f
|
||||
fcmovnb %st(1), %st
|
||||
|
||||
fstp %st(1)
|
||||
|
||||
ret
|
||||
|
||||
2: // Unordered.
|
||||
fucomi %st(0), %st
|
||||
jp 3f
|
||||
// st(1) is a NaN; st(0) is not. Test if st(1) is signaling.
|
||||
testb $0x40, 11(%esp)
|
||||
jz 4f
|
||||
fstp %st(1)
|
||||
ret
|
||||
|
||||
3: // st(0) is a NaN; st(1) may or may not be.
|
||||
fxch
|
||||
fucomi %st(0), %st
|
||||
jp 4f
|
||||
// st(1) is a NaN; st(0) is not. Test if st(1) is signaling.
|
||||
testb $0x40, 23(%esp)
|
||||
jz 4f
|
||||
fstp %st(1)
|
||||
ret
|
||||
|
||||
4: // Both arguments are NaNs, or one is a signaling NaN.
|
||||
faddp
|
||||
ret
|
||||
END(__fminl)
|
||||
weak_alias (__fminl, fminl)
|
||||
|
||||
@ -27,8 +27,25 @@ ENTRY(__fmax)
|
||||
jmp 2f
|
||||
|
||||
1: ucomisd %xmm1, %xmm1 // Is xmm1 a NaN?
|
||||
jp 2f // then return xmm0
|
||||
jp 3f
|
||||
// xmm0 is a NaN; xmm1 is not. Test if xmm0 is signaling.
|
||||
movsd %xmm0, -8(%rsp)
|
||||
testb $0x8, -2(%rsp)
|
||||
jz 4f
|
||||
movsd %xmm1, %xmm0 // otherwise return xmm1
|
||||
ret
|
||||
|
||||
3: // xmm1 is a NaN; xmm0 may or may not be.
|
||||
ucomisd %xmm0, %xmm0
|
||||
jp 4f
|
||||
// xmm1 is a NaN; xmm0 is not. Test if xmm1 is signaling.
|
||||
movsd %xmm1, -8(%rsp)
|
||||
testb $0x8, -2(%rsp)
|
||||
jz 4f
|
||||
ret
|
||||
|
||||
4: // Both arguments are NaNs, or one is a signaling NaN.
|
||||
addsd %xmm1, %xmm0
|
||||
|
||||
2: ret
|
||||
END(__fmax)
|
||||
|
||||
@ -27,8 +27,25 @@ ENTRY(__fmaxf)
|
||||
jmp 2f
|
||||
|
||||
1: ucomiss %xmm1, %xmm1 // Is xmm1 a NaN?
|
||||
jp 2f // then return xmm0
|
||||
jp 3f
|
||||
// xmm0 is a NaN; xmm1 is not. Test if xmm0 is signaling.
|
||||
movss %xmm0, -4(%rsp)
|
||||
testb $0x40, -2(%rsp)
|
||||
jz 4f
|
||||
movss %xmm1, %xmm0 // otherwise return xmm1
|
||||
ret
|
||||
|
||||
3: // xmm1 is a NaN; xmm0 may or may not be.
|
||||
ucomiss %xmm0, %xmm0
|
||||
jp 4f
|
||||
// xmm1 is a NaN; xmm0 is not. Test if xmm1 is signaling.
|
||||
movss %xmm1, -4(%rsp)
|
||||
testb $0x40, -2(%rsp)
|
||||
jz 4f
|
||||
ret
|
||||
|
||||
4: // Both arguments are NaNs, or one is a signaling NaN.
|
||||
addss %xmm1, %xmm0
|
||||
|
||||
2: ret
|
||||
END(__fmaxf)
|
||||
|
||||
@ -24,16 +24,35 @@ ENTRY(__fmaxl)
|
||||
fldt 8(%rsp) // x
|
||||
fldt 24(%rsp) // x : y
|
||||
|
||||
fucomi %st(0), %st
|
||||
fcmovu %st(1), %st // now %st contains y if not NaN, x otherwise
|
||||
|
||||
fxch
|
||||
|
||||
fucomi %st(1), %st
|
||||
jp 2f
|
||||
fcmovb %st(1), %st
|
||||
|
||||
fstp %st(1)
|
||||
|
||||
ret
|
||||
|
||||
2: // Unordered.
|
||||
fucomi %st(0), %st
|
||||
jp 3f
|
||||
// st(1) is a NaN; st(0) is not. Test if st(1) is signaling.
|
||||
testb $0x40, 15(%rsp)
|
||||
jz 4f
|
||||
fstp %st(1)
|
||||
ret
|
||||
|
||||
3: // st(0) is a NaN; st(1) may or may not be.
|
||||
fxch
|
||||
fucomi %st(0), %st
|
||||
jp 4f
|
||||
// st(1) is a NaN; st(0) is not. Test if st(1) is signaling.
|
||||
testb $0x40, 31(%rsp)
|
||||
jz 4f
|
||||
fstp %st(1)
|
||||
ret
|
||||
|
||||
4: // Both arguments are NaNs, or one is a signaling NaN.
|
||||
faddp
|
||||
ret
|
||||
END(__fmaxl)
|
||||
weak_alias (__fmaxl, fmaxl)
|
||||
|
||||
@ -27,8 +27,25 @@ ENTRY(__fmin)
|
||||
jmp 2f
|
||||
|
||||
1: ucomisd %xmm1, %xmm1 // Is xmm1 a NaN?
|
||||
jp 2f // then return xmm0
|
||||
jp 3f
|
||||
// xmm0 is a NaN; xmm1 is not. Test if xmm0 is signaling.
|
||||
movsd %xmm0, -8(%rsp)
|
||||
testb $0x8, -2(%rsp)
|
||||
jz 4f
|
||||
movsd %xmm1, %xmm0 // otherwise return xmm1
|
||||
ret
|
||||
|
||||
3: // xmm1 is a NaN; xmm0 may or may not be.
|
||||
ucomisd %xmm0, %xmm0
|
||||
jp 4f
|
||||
// xmm1 is a NaN; xmm0 is not. Test if xmm1 is signaling.
|
||||
movsd %xmm1, -8(%rsp)
|
||||
testb $0x8, -2(%rsp)
|
||||
jz 4f
|
||||
ret
|
||||
|
||||
4: // Both arguments are NaNs, or one is a signaling NaN.
|
||||
addsd %xmm1, %xmm0
|
||||
|
||||
2: ret
|
||||
END(__fmin)
|
||||
|
||||
@ -27,8 +27,25 @@ ENTRY(__fminf)
|
||||
jmp 2f
|
||||
|
||||
1: ucomiss %xmm1, %xmm1 // Is xmm1 a NaN?
|
||||
jp 2f // then return xmm0
|
||||
jp 3f
|
||||
// xmm0 is a NaN; xmm1 is not. Test if xmm0 is signaling.
|
||||
movss %xmm0, -4(%rsp)
|
||||
testb $0x40, -2(%rsp)
|
||||
jz 4f
|
||||
movss %xmm1, %xmm0 // otherwise return xmm1
|
||||
ret
|
||||
|
||||
3: // xmm1 is a NaN; xmm0 may or may not be.
|
||||
ucomiss %xmm0, %xmm0
|
||||
jp 4f
|
||||
// xmm1 is a NaN; xmm0 is not. Test if xmm1 is signaling.
|
||||
movss %xmm1, -4(%rsp)
|
||||
testb $0x40, -2(%rsp)
|
||||
jz 4f
|
||||
ret
|
||||
|
||||
4: // Both arguments are NaNs, or one is a signaling NaN.
|
||||
addss %xmm1, %xmm0
|
||||
|
||||
2: ret
|
||||
END(__fminf)
|
||||
|
||||
@ -24,14 +24,35 @@ ENTRY(__fminl)
|
||||
fldt 8(%rsp) // x
|
||||
fldt 24(%rsp) // x : y
|
||||
|
||||
fucomi %st(0), %st
|
||||
fcmovu %st(1), %st // now %st contains y if not NaN, x otherwise
|
||||
|
||||
fucomi %st(1), %st
|
||||
jp 2f
|
||||
fcmovnb %st(1), %st
|
||||
|
||||
fstp %st(1)
|
||||
|
||||
ret
|
||||
|
||||
2: // Unordered.
|
||||
fucomi %st(0), %st
|
||||
jp 3f
|
||||
// st(1) is a NaN; st(0) is not. Test if st(1) is signaling.
|
||||
testb $0x40, 15(%rsp)
|
||||
jz 4f
|
||||
fstp %st(1)
|
||||
ret
|
||||
|
||||
3: // st(0) is a NaN; st(1) may or may not be.
|
||||
fxch
|
||||
fucomi %st(0), %st
|
||||
jp 4f
|
||||
// st(1) is a NaN; st(0) is not. Test if st(1) is signaling.
|
||||
testb $0x40, 31(%rsp)
|
||||
jz 4f
|
||||
fstp %st(1)
|
||||
ret
|
||||
|
||||
4: // Both arguments are NaNs, or one is a signaling NaN.
|
||||
faddp
|
||||
ret
|
||||
END(__fminl)
|
||||
weak_alias (__fminl, fminl)
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user