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| author | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2014-04-28 14:38:24 -0500 |
|---|---|---|
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2014-04-29 07:05:39 -0500 |
| commit | 18f2945ae9216cfcd53a162080a73e3d719de9e6 (patch) | |
| tree | 8d529fe01c41f0d3c6dd290aa69dbf4e5d6e083f /sysdeps/powerpc/fpu/fesetenv.c | |
| parent | 5abebba403181de898bbea4ee1bcce5f088c663b (diff) | |
| download | glibc-18f2945ae9216cfcd53a162080a73e3d719de9e6.zip glibc-18f2945ae9216cfcd53a162080a73e3d719de9e6.tar.gz glibc-18f2945ae9216cfcd53a162080a73e3d719de9e6.tar.bz2 | |
PowerPC: Suppress unnecessary FPSCR write
This patch optimizes the FPSCR update on exception and rounding change
functions by just updating its value if new value if different from
current one. It also optimizes fedisableexcept and feenableexcept by
removing an unecessary FPSCR read.
Diffstat (limited to 'sysdeps/powerpc/fpu/fesetenv.c')
| -rw-r--r-- | sysdeps/powerpc/fpu/fesetenv.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sysdeps/powerpc/fpu/fesetenv.c b/sysdeps/powerpc/fpu/fesetenv.c index fa99ddb..138bde0 100644 --- a/sysdeps/powerpc/fpu/fesetenv.c +++ b/sysdeps/powerpc/fpu/fesetenv.c @@ -29,6 +29,8 @@ __fesetenv (const fenv_t *envp) /* get the currently set exceptions. */ new.fenv = *envp; old.fenv = fegetenv_register (); + if (old.l == new.l) + return 0; /* If the old env has no enabled exceptions and the new env has any enabled exceptions, then unmask SIGFPE in the MSR FE0/FE1 bits. This will put the |