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| author | stefanf <stefanf@FreeBSD.org> | 2004-06-19 09:30:00 +0000 |
|---|---|---|
| committer | stefanf <stefanf@FreeBSD.org> | 2004-06-19 09:30:00 +0000 |
| commit | ac3aff330075054b5dd3eb4aaf48991fc3ca1d7c (patch) | |
| tree | a09537e97cdb74aa234d3df047d2805a4f77daa4 /lib/msun | |
| parent | 127bbb4fe3f68ad22d400dd4d7dcf14f9104bc81 (diff) | |
| download | FreeBSD-src-ac3aff330075054b5dd3eb4aaf48991fc3ca1d7c.zip FreeBSD-src-ac3aff330075054b5dd3eb4aaf48991fc3ca1d7c.tar.gz | |
Return the same result as the MI version for 0.0, INFINITY and NaN.
Reviewed by: standards@
Diffstat (limited to 'lib/msun')
| -rw-r--r-- | lib/msun/i387/s_ilogb.S | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/lib/msun/i387/s_ilogb.S b/lib/msun/i387/s_ilogb.S index c9de0bd..34497a8 100644 --- a/lib/msun/i387/s_ilogb.S +++ b/lib/msun/i387/s_ilogb.S @@ -33,10 +33,15 @@ * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. */ +#include <machine/_limits.h> #include <machine/asm.h> RCSID("$FreeBSD$") +#define FP_ILOGB0 (-__INT_MAX) +#define FP_ILOGBNAN __INT_MAX +#define FP_ILOGBINF __INT_MAX + ENTRY(ilogb) pushl %ebp movl %esp,%ebp @@ -44,10 +49,35 @@ ENTRY(ilogb) fldl 8(%ebp) fxtract - fstp %st + fstp %st(0) fistpl -4(%ebp) movl -4(%ebp),%eax + /* fistpl yields __INT_MIN for NaN, Inf and 0. */ + cmpl $__INT_MIN,%eax + je .L2 + +.L1: leave ret + +.L2: + fldl 8(%ebp) + fldz + fucompp + fnstsw %ax + sahf + jp .L3 + jz .L4 + + movl $FP_ILOGBINF,%eax + jmp .L1 + +.L3: + movl $FP_ILOGBNAN,%eax + jmp .L1 + +.L4: + movl $FP_ILOGB0,%eax + jmp .L1 |
