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Return the same result as the MI version for 0.0, INFINITY and NaN.

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Reviewed by:	standards@
This commit is contained in:
Stefan Farfeleder 2004-06-19 09:30:00 +00:00
parent 83bc89312c
commit b6161bb16a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=130714
1 changed files with 31 additions and 1 deletions
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32
lib/msun/i387/s_ilogb.S
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@ -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