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b2a64460ba
This patch refactors code in sysdeps/x86_64/fpu that forces underflow exceptions and closely follows corresponding i386 code to use common macros in x86_64-math-asm.h for that purpose. This is mainly about keeping the code similar to the i386 code as far as possible, since each macro apart from DEFINE_LDBL_MIN ends up used only once. It would be possible to do a further refactoring to share these macros between i386 and x86_64 (with i386 using the fcomip / fucomip versions when building for i686 and above), but I have no immediate plans to do so. Tested for x86_64. * sysdeps/x86_64/fpu/x86_64-math-asm.h: New file. * sysdeps/x86_64/fpu/e_exp2l.S: Include <x86_64-math-asm.h>. (ldbl_min): Replace with use of DEFINE_LDBL_MIN. (__ieee754_exp2l): Use LDBL_CHECK_FORCE_UFLOW_NONNEG_NAN. * sysdeps/x86_64/fpu/e_expl.S: Include <x86_64-math-asm.h>. [!USE_AS_EXPM1L] (cmin): Replace with use of DEFINE_LDBL_MIN. (IEEE754_EXPL): Use LDBL_CHECK_FORCE_UFLOW_NONNEG.
59 lines
1.2 KiB
ArmAsm
59 lines
1.2 KiB
ArmAsm
/*
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* Written by J.T. Conklin <jtc@netbsd.org>.
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* Adapted for exp2 by Ulrich Drepper <drepper@cygnus.com>.
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* Adapted for x86-64 by Andreas Jaeger <aj@suse.de>.
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* Public domain.
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*/
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#include <machine/asm.h>
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#include <x86_64-math-asm.h>
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DEFINE_LDBL_MIN
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#ifdef PIC
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# define MO(op) op##(%rip)
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#else
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# define MO(op) op
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#endif
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.text
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ENTRY(__ieee754_exp2l)
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fldt 8(%rsp)
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/* I added the following ugly construct because exp(+-Inf) resulted
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in NaN. The ugliness results from the bright minds at Intel.
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For the i686 the code can be written better.
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-- drepper@cygnus.com. */
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fxam /* Is NaN or +-Inf? */
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fstsw %ax
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movb $0x45, %dh
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andb %ah, %dh
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cmpb $0x05, %dh
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je 1f /* Is +-Inf, jump. */
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movzwl 8+8(%rsp), %eax
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andl $0x7fff, %eax
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cmpl $0x3fbe, %eax
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jge 3f
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/* Argument's exponent below -65, result rounds to 1. */
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fld1
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faddp
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ret
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3: fld %st
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frndint /* int(x) */
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fsubr %st,%st(1) /* fract(x) */
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fxch
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f2xm1 /* 2^(fract(x)) - 1 */
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fld1
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faddp /* 2^(fract(x)) */
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fscale /* e^x */
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fstp %st(1)
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LDBL_CHECK_FORCE_UFLOW_NONNEG_NAN
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ret
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1: testl $0x200, %eax /* Test sign. */
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jz 2f /* If positive, jump. */
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fstp %st
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fldz /* Set result to 0. */
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2: ret
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END (__ieee754_exp2l)
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strong_alias (__ieee754_exp2l, __exp2l_finite)
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