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30 lines
1.1 KiB
30 lines
1.1 KiB
2 years ago
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commit 36c17c7079a5243a890ba43affff326a041775a9
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Author: Paul A. Clarke <pc@us.ibm.com>
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Date: Thu Sep 19 11:31:31 2019 -0500
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[powerpc] libc_feholdsetround_noex_ppc_ctx: optimize FPSCR write
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libc_feholdsetround_noex_ppc_ctx currently performs:
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1. Read FPSCR, save to context.
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2. Create new FPSCR value: clear enables and set new rounding mode.
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3. Write new value to FPSCR.
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Since other bits just pass through, there is no need to write them.
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Instead, write just the changed values (enables and rounding mode),
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which can be a bit more efficient.
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diff --git a/sysdeps/powerpc/fpu/fenv_private.h b/sysdeps/powerpc/fpu/fenv_private.h
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index 86a3611b3ef41759..c88142fe3053580f 100644
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--- a/sysdeps/powerpc/fpu/fenv_private.h
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+++ b/sysdeps/powerpc/fpu/fenv_private.h
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@@ -142,7 +142,7 @@ libc_feholdsetround_noex_ppc_ctx (struct rm_ctx *ctx, int r)
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if (__glibc_unlikely (new.l != old.l))
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{
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__TEST_AND_ENTER_NON_STOP (old.l, 0ULL);
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- fesetenv_register (new.fenv);
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+ fesetenv_mode (new.fenv);
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ctx->updated_status = true;
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}
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else
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