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From: Corinna Vinschen <corinna@sourceware.org> To: newlib-cvs@sourceware.org Subject: [newlib-cygwin] libm: ARM without HW double does not have fast FMA Date: Mon, 10 Aug 2020 19:06:29 +0000 (GMT) [thread overview] Message-ID: <20200810190629.36CD83857C53@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=432b331c79a379ef92635fc173b4689b6d5b3feb commit 432b331c79a379ef92635fc173b4689b6d5b3feb Author: Keith Packard via Newlib <newlib@sourceware.org> Date: Sat Aug 8 15:34:11 2020 -0700 libm: ARM without HW double does not have fast FMA 32-bit ARM processors with HW float (but not HW double) may define __ARM_FEATURE_FMA, but that only means they have fast FMA for 32-bit floats. Signed-off-by: Keith Packard <keithp@keithp.com> Diff: --- newlib/libm/common/math_config.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/newlib/libm/common/math_config.h b/newlib/libm/common/math_config.h index 1089b0ec6..df8f8d6e4 100644 --- a/newlib/libm/common/math_config.h +++ b/newlib/libm/common/math_config.h @@ -72,7 +72,7 @@ /* Compiler can inline fma as a single instruction. */ #ifndef HAVE_FAST_FMA -# if __aarch64__ || __ARM_FEATURE_FMA +# if __aarch64__ || (__ARM_FEATURE_FMA && (__ARM_FP & 8)) # define HAVE_FAST_FMA 1 # else # define HAVE_FAST_FMA 0
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