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| author | Paul A. Clarke <pc@us.ibm.com> | 2019-09-19 11:31:31 -0500 |
|---|---|---|
| committer | Paul A. Clarke <pc@us.ibm.com> | 2019-09-27 11:01:54 -0500 |
| commit | 36c17c7079a5243a890ba43affff326a041775a9 (patch) | |
| tree | cba6527c4987bf4fef2c179b1b57beacaf8d73fc | |
| parent | 81ecb0ee4970865cbe5d1da733c4879b999c528f (diff) | |
| download | glibc-36c17c7079a5243a890ba43affff326a041775a9.tar.gz | |
[powerpc] libc_feholdsetround_noex_ppc_ctx: optimize FPSCR write
libc_feholdsetround_noex_ppc_ctx currently performs:
1. Read FPSCR, save to context.
2. Create new FPSCR value: clear enables and set new rounding mode.
3. Write new value to FPSCR.
Since other bits just pass through, there is no need to write them.
Instead, write just the changed values (enables and rounding mode),
which can be a bit more efficient.
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | sysdeps/powerpc/fpu/fenv_private.h | 2 |
2 files changed, 7 insertions, 1 deletions
@@ -1,5 +1,11 @@ 2019-09-27 Paul A. Clarke <pc@us.ibm.com> + * sysdeps/powerpc/fpu/fenv_private.h + (libc_feholdsetround_noex_ppc_ctx): Call fesetenv_mode instead + of fesetenv_register. + +2019-09-27 Paul A. Clarke <pc@us.ibm.com> + * sysdeps/powerpc/fpu/fenv_libc.h (fegetenv_status): Rename to fegetenv_control. * sysdeps/powerpc/fpu/fedisblxcpt.c (fedisableexcept): Accommodate diff --git a/sysdeps/powerpc/fpu/fenv_private.h b/sysdeps/powerpc/fpu/fenv_private.h index 94960262dd..ade0bfaf5f 100644 --- a/sysdeps/powerpc/fpu/fenv_private.h +++ b/sysdeps/powerpc/fpu/fenv_private.h @@ -142,7 +142,7 @@ libc_feholdsetround_noex_ppc_ctx (struct rm_ctx *ctx, int r) if (__glibc_unlikely (new.l != old.l)) { __TEST_AND_ENTER_NON_STOP (old.l, 0ULL); - fesetenv_register (new.fenv); + fesetenv_mode (new.fenv); ctx->updated_status = true; } else |