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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/fedisblxcpt.c | |
| parent | 5abebba403181de898bbea4ee1bcce5f088c663b (diff) | |
| download | glibc-18f2945ae9216cfcd53a162080a73e3d719de9e6.tar.gz glibc-18f2945ae9216cfcd53a162080a73e3d719de9e6.tar.xz glibc-18f2945ae9216cfcd53a162080a73e3d719de9e6.zip | |
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/fedisblxcpt.c')
| -rw-r--r-- | sysdeps/powerpc/fpu/fedisblxcpt.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/sysdeps/powerpc/fpu/fedisblxcpt.c b/sysdeps/powerpc/fpu/fedisblxcpt.c index 5883e09263..94c01abb86 100644 --- a/sysdeps/powerpc/fpu/fedisblxcpt.c +++ b/sysdeps/powerpc/fpu/fedisblxcpt.c @@ -22,15 +22,17 @@ int fedisableexcept (int excepts) { - fenv_union_t fe; - int result, new; + fenv_union_t fe, curr; + int result = 0, new; - result = __fegetexcept (); + /* Get current exception mask to return. */ + fe.fenv = curr.fenv = fegetenv_register (); + result = fenv_reg_to_exceptions (fe.l); if ((excepts & FE_ALL_INVALID) == FE_ALL_INVALID) excepts = (excepts | FE_INVALID) & ~ FE_ALL_INVALID; - fe.fenv = fegetenv_register (); + /* Sets the new exception mask. */ if (excepts & FE_INEXACT) fe.l &= ~(1 << (31 - FPSCR_XE)); if (excepts & FE_DIVBYZERO) @@ -41,7 +43,9 @@ fedisableexcept (int excepts) fe.l &= ~(1 << (31 - FPSCR_OE)); if (excepts & FE_INVALID) fe.l &= ~(1 << (31 - FPSCR_VE)); - fesetenv_register (fe.fenv); + + if (fe.l != curr.l) + fesetenv_register (fe.fenv); new = __fegetexcept (); if (new == 0 && result != 0) |