From 36c17c7079a5243a890ba43affff326a041775a9 Mon Sep 17 00:00:00 2001 From: "Paul A. Clarke" Date: Thu, 19 Sep 2019 11:31:31 -0500 Subject: [PATCH] [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. --- ChangeLog | 6 ++++++ sysdeps/powerpc/fpu/fenv_private.h | 2 +- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/ChangeLog b/ChangeLog index 6c28351c37..3c792b4317 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,9 @@ +2019-09-27 Paul A. Clarke + + * sysdeps/powerpc/fpu/fenv_private.h + (libc_feholdsetround_noex_ppc_ctx): Call fesetenv_mode instead + of fesetenv_register. + 2019-09-27 Paul A. Clarke * sysdeps/powerpc/fpu/fenv_libc.h (fegetenv_status): Rename to 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