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Hi! With the latest bits/mathinline.h, echo '#include <math.h>' | gcc -S -xc - -o - -std=c99 -O2 -m32 doesn't compile: /usr/include/bits/mathinline.h:39: error: impossible constraint in 'asm' /usr/include/bits/mathinline.h:46: error: impossible constraint in 'asm' The problem is that SSE{,2} assembly and "x" constraint is used even in 32-bit code. Here is an untested fix: 2009-09-01 Jakub Jelinek <jakub@redhat.com> * sysdeps/x86_64/fpu/bits/mathinline.h: Include bits/wordsize.h. (__signbitf, __signbit): Only use SSE inline asm for 64-bit. diff --git a/sysdeps/x86_64/fpu/bits/mathinline.h b/sysdeps/x86_64/fpu/bits/mathinline.h index ece0f02..dc58f67 100644 --- a/sysdeps/x86_64/fpu/bits/mathinline.h +++ b/sysdeps/x86_64/fpu/bits/mathinline.h @@ -22,6 +22,8 @@ # error "Never use <bits/mathinline.h> directly; include <math.h> instead." #endif +#include <bits/wordsize.h> + #ifndef __extern_inline # define __MATH_INLINE __inline #else @@ -35,16 +37,26 @@ __MATH_INLINE int __NTH (__signbitf (float __x)) { +#if __WORDSIZE == 32 + __extension__ union { float __f; int __i; } __u = { __f: __x }; + return __u.__i < 0; +#else int __m; __asm ("pmovmskb %1, %0" : "=r" (__m) : "x" (__x)); return __m & 0x8; +#endif } __MATH_INLINE int __NTH (__signbit (double __x)) { +#if __WORDSIZE == 32 + __extension__ union { double __d; int __i[2]; } __u = { __d: __x }; + return __u.__i[1] < 0; +#else int __m; __asm ("pmovmskb %1, %0" : "=r" (__m) : "x" (__x)); return __m & 0x80; +#endif } __MATH_INLINE int __NTH (__signbitl (long double __x)) Jakub
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