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* sysdeps/i386/fpu/bits/mathinline.h: Add support for builtin
	unordered compare functions to gcc 2.97 and up.
This commit is contained in:
Ulrich Drepper 2000-11-01 17:55:36 +00:00
parent e8e24320d2
commit a720a3aceb
2 changed files with 28 additions and 15 deletions
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ChangeLog
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@ -1,5 +1,8 @@
2000-11-01 Ulrich Drepper <drepper@redhat.com>
* sysdeps/i386/fpu/bits/mathinline.h: Add support for builtin
unordered compare functions to gcc 2.97 and up.
* string/bits/string2.h: Disable strstr optimizations for newer
gcc versions. Patch by Joseph S. Myers <jsm28@cam.ac.uk>.

40
sysdeps/i386/fpu/bits/mathinline.h
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@ -30,85 +30,95 @@
#if defined __USE_ISOC99 && defined __GNUC__ && __GNUC__ >= 2
# if __GNUC_PREREQ (2,97)
/* GCC 2.97 and up have builtins that actually can be used. */
# define isgreater(x, y) __builtin_isgreater (x, y)
# define isgreaterequal(x, y) __builtin_isgreaterequal (x, y)
# define isless(x, y) __builtin_isless (x, y)
# define islessequal(x, y) __builtin_islessequal (x, y)
# define islessgreater(x, y) __builtin_islessgreater (x, y)
# define isunordered(x, y) __builtin_isunordered (x, y)
# else
/* ISO C99 defines some macros to perform unordered comparisons. The
ix87 FPU supports this with special opcodes and we should use them.
These must not be inline functions since we have to be able to handle
all floating-point types. */
# ifdef __i686__
# ifdef __i686__
/* For the PentiumPro and more recent processors we can provide
better code. */
# define isgreater(x, y) \
# define isgreater(x, y) \
({ register char __result; \
__asm__ ("fucomip %%st(1), %%st; seta %%al" \
: "=a" (__result) : "u" (y), "t" (x) : "cc", "st"); \
__result; })
# define isgreaterequal(x, y) \
# define isgreaterequal(x, y) \
({ register char __result; \
__asm__ ("fucomip %%st(1), %%st; setae %%al" \
: "=a" (__result) : "u" (y), "t" (x) : "cc", "st"); \
__result; })
# define isless(x, y) \
# define isless(x, y) \
({ register char __result; \
__asm__ ("fucomip %%st(1), %%st; seta %%al" \
: "=a" (__result) : "u" (x), "t" (y) : "cc", "st"); \
__result; })
# define islessequal(x, y) \
# define islessequal(x, y) \
({ register char __result; \
__asm__ ("fucomip %%st(1), %%st; setae %%al" \
: "=a" (__result) : "u" (x), "t" (y) : "cc", "st"); \
__result; })
# define islessgreater(x, y) \
# define islessgreater(x, y) \
({ register char __result; \
__asm__ ("fucomip %%st(1), %%st; setne %%al" \
: "=a" (__result) : "u" (y), "t" (x) : "cc", "st"); \
__result; })
# define isunordered(x, y) \
# define isunordered(x, y) \
({ register char __result; \
__asm__ ("fucomip %%st(1), %%st; setp %%al" \
: "=a" (__result) : "u" (y), "t" (x) : "cc", "st"); \
__result; })
# else
# else
/* This is the dumb, portable code for i386 and above. */
# define isgreater(x, y) \
# define isgreater(x, y) \
({ register char __result; \
__asm__ ("fucompp; fnstsw; testb $0x45, %%ah; setz %%al" \
: "=a" (__result) : "u" (y), "t" (x) : "cc", "st", "st(1)"); \
__result; })
# define isgreaterequal(x, y) \
# define isgreaterequal(x, y) \
({ register char __result; \
__asm__ ("fucompp; fnstsw; testb $0x05, %%ah; setz %%al" \
: "=a" (__result) : "u" (y), "t" (x) : "cc", "st", "st(1)"); \
__result; })
# define isless(x, y) \
# define isless(x, y) \
({ register char __result; \
__asm__ ("fucompp; fnstsw; testb $0x45, %%ah; setz %%al" \
: "=a" (__result) : "u" (x), "t" (y) : "cc", "st", "st(1)"); \
__result; })
# define islessequal(x, y) \
# define islessequal(x, y) \
({ register char __result; \
__asm__ ("fucompp; fnstsw; testb $0x05, %%ah; setz %%al" \
: "=a" (__result) : "u" (x), "t" (y) : "cc", "st", "st(1)"); \
__result; })
# define islessgreater(x, y) \
# define islessgreater(x, y) \
({ register char __result; \
__asm__ ("fucompp; fnstsw; testb $0x44, %%ah; setz %%al" \
: "=a" (__result) : "u" (y), "t" (x) : "cc", "st", "st(1)"); \
__result; })
# define isunordered(x, y) \
# define isunordered(x, y) \
({ register char __result; \
__asm__ ("fucompp; fnstsw; sahf; setp %%al" \
: "=a" (__result) : "u" (y), "t" (x) : "cc", "st", "st(1)"); \
__result; })
# endif /* __i686__ */
# endif /* __i686__ */
# endif /* GCC 2.97 */
/* The gcc, version 2.7 or below, has problems with all this inlining
code. So disable it for this version of the compiler. */