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| author | Joseph Myers <joseph@codesourcery.com> | 2016-06-22 15:40:30 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2016-06-22 15:40:30 +0000 |
| commit | 4e9bf327ad02ed83bded4011af68613e6b03ab33 (patch) | |
| tree | 20dfec4dcf14d0772751092bcb340c02b535b9a9 | |
| parent | 11f4944d7f3d179408c7b8814eafdc383a1b3416 (diff) | |
| download | glibc-4e9bf327ad02ed83bded4011af68613e6b03ab33.tar glibc-4e9bf327ad02ed83bded4011af68613e6b03ab33.tar.gz glibc-4e9bf327ad02ed83bded4011af68613e6b03ab33.tar.bz2 glibc-4e9bf327ad02ed83bded4011af68613e6b03ab33.zip | |
Simplify x86 nearbyint functions.
The i386 implementations of nearbyint functions, and x86_64
nearbyintl, contain code to mask the "inexact" exception. However,
the fnstenv instruction has the effect of masking all exceptions, so
this masking code has been redundant since fnstenv was added to those
implementations (by commit 846d9a4a3acdb4939ca7bf6aed48f9f6f26911be;
commit 71d1b0166b4ace0d804af2993b3815758b852efc added the test
math/test-nearbyint-except-2.c that verifies these functions do work
when called with "inexact" traps enabled); this patch removes the
redundant code.
Tested for x86_64 and x86.
* sysdeps/i386/fpu/s_nearbyint.S (__nearbyint): Do not mask
"inexact" exceptions after fnstenv.
* sysdeps/i386/fpu/s_nearbyintf.S (__nearbyintf): Likewise.
* sysdeps/i386/fpu/s_nearbyintl.S (__nearbyintl): Likewise.
* sysdeps/x86_64/fpu/s_nearbyintl.S (__nearbyintl): Likewise.
| -rw-r--r-- | ChangeLog | 8 | ||||
| -rw-r--r-- | sysdeps/i386/fpu/s_nearbyint.S | 4 | ||||
| -rw-r--r-- | sysdeps/i386/fpu/s_nearbyintf.S | 4 | ||||
| -rw-r--r-- | sysdeps/i386/fpu/s_nearbyintl.S | 4 | ||||
| -rw-r--r-- | sysdeps/x86_64/fpu/s_nearbyintl.S | 4 |
5 files changed, 8 insertions, 16 deletions
@@ -1,3 +1,11 @@ +2016-06-22 Joseph Myers <joseph@codesourcery.com> + + * sysdeps/i386/fpu/s_nearbyint.S (__nearbyint): Do not mask + "inexact" exceptions after fnstenv. + * sysdeps/i386/fpu/s_nearbyintf.S (__nearbyintf): Likewise. + * sysdeps/i386/fpu/s_nearbyintl.S (__nearbyintl): Likewise. + * sysdeps/x86_64/fpu/s_nearbyintl.S (__nearbyintl): Likewise. + 2015-06-22 Zack Weinberg <zackw@panix.com> * sysdeps/generic/bits/hwcap.h: Moved to ... diff --git a/sysdeps/i386/fpu/s_nearbyint.S b/sysdeps/i386/fpu/s_nearbyint.S index 8da8ae9792..f7b79b6ff2 100644 --- a/sysdeps/i386/fpu/s_nearbyint.S +++ b/sysdeps/i386/fpu/s_nearbyint.S @@ -11,10 +11,6 @@ ENTRY(__nearbyint) subl $32, %esp cfi_adjust_cfa_offset (32) fnstenv 4(%esp) - movl 4(%esp), %eax - orl $0x20, %eax - movl %eax, (%esp) - fldcw (%esp) frndint fldenv 4(%esp) addl $32, %esp diff --git a/sysdeps/i386/fpu/s_nearbyintf.S b/sysdeps/i386/fpu/s_nearbyintf.S index 0c51f72364..92df2f87b3 100644 --- a/sysdeps/i386/fpu/s_nearbyintf.S +++ b/sysdeps/i386/fpu/s_nearbyintf.S @@ -11,10 +11,6 @@ ENTRY(__nearbyintf) subl $32, %esp cfi_adjust_cfa_offset (32) fnstenv 4(%esp) - movl 4(%esp), %eax - orl $0x20, %eax - movl %eax, (%esp) - fldcw (%esp) frndint fldenv 4(%esp) addl $32, %esp diff --git a/sysdeps/i386/fpu/s_nearbyintl.S b/sysdeps/i386/fpu/s_nearbyintl.S index b260ab5914..3b7d1e2436 100644 --- a/sysdeps/i386/fpu/s_nearbyintl.S +++ b/sysdeps/i386/fpu/s_nearbyintl.S @@ -11,10 +11,6 @@ ENTRY(__nearbyintl) subl $32, %esp cfi_adjust_cfa_offset (32) fnstenv 4(%esp) - movl 4(%esp), %eax - orl $0x20, %eax - movl %eax, (%esp) - fldcw (%esp) frndint fnstsw andl $0x1, %eax diff --git a/sysdeps/x86_64/fpu/s_nearbyintl.S b/sysdeps/x86_64/fpu/s_nearbyintl.S index 76d41bdd52..31b21a5037 100644 --- a/sysdeps/x86_64/fpu/s_nearbyintl.S +++ b/sysdeps/x86_64/fpu/s_nearbyintl.S @@ -9,10 +9,6 @@ ENTRY(__nearbyintl) fldt 8(%rsp) fnstenv -28(%rsp) - movl -28(%rsp), %eax - orl $0x20, %eax - movl %eax, -32(%rsp) - fldcw -32(%rsp) frndint fnstsw andl $0x1, %eax |