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Cygwin: ilogbl: Make sure to return FP_ILGB0 on zero input 

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2019-12-16 10:50:17 +01:00 committed by Ken Brown
parent 013e445fa4
commit 9ccc706bdd
2 changed files with 13 additions and 0 deletions
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10
winsup/cygwin/math/ilogbl.S
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@ -23,6 +23,8 @@ __MINGW_USYMBOL(ilogbl):
andb %ah, %dh andb %ah, %dh
cmpb $0x05, %dh cmpb $0x05, %dh
je 1f /* Is +-Inf, jump. */ je 1f /* Is +-Inf, jump. */
cmpb $0x40, %dh
je 2f /* Is +-Inf, jump. */
fxtract fxtract
pushq %rax pushq %rax
@ -37,6 +39,9 @@ __MINGW_USYMBOL(ilogbl):
1: fstp %st 1: fstp %st
movl $0x7fffffff, %eax movl $0x7fffffff, %eax
ret ret
2: fstp %st
movl $0x80000001, %eax /* FP_ILOGB0 */
ret
#else #else
fldt 4(%esp) fldt 4(%esp)
/* I added the following ugly construct because ilogb(+-Inf) is /* I added the following ugly construct because ilogb(+-Inf) is
@ -48,6 +53,8 @@ __MINGW_USYMBOL(ilogbl):
andb %ah, %dh andb %ah, %dh
cmpb $0x05, %dh cmpb $0x05, %dh
je 1f /* Is +-Inf, jump. */ je 1f /* Is +-Inf, jump. */
cmpb $0x40, %dh
je 2f /* Is +-Inf, jump. */
fxtract fxtract
pushl %eax pushl %eax
@ -62,4 +69,7 @@ __MINGW_USYMBOL(ilogbl):
1: fstp %st 1: fstp %st
movl $0x7fffffff, %eax movl $0x7fffffff, %eax
ret ret
2: fstp %st
movl $0x80000001, %eax /* FP_ILOGB0 */
ret
#endif #endif

3
winsup/cygwin/release/3.1.0
View File

@ -108,3 +108,6 @@ Bug Fixes
- Fix an assertion failure when /cygdrive contains an offline network - Fix an assertion failure when /cygdrive contains an offline network
drive. drive.
Addresses: https://cygwin.com/ml/cygwin/2019-12/msg00016.html Addresses: https://cygwin.com/ml/cygwin/2019-12/msg00016.html
- Fix return value of ilogbl for 0 input.
Addresses: https://cygwin.com/ml/cygwin/2019-12/msg00074.html