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From: Peter Maydell <peter.maydell@linaro.org>
To: qemu-devel@nongnu.org
Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= <alex.bennee@linaro.org>,
Richard Henderson <richard.henderson@linaro.org>,
Paolo Bonzini <pbonzini@redhat.com>, Eduardo Habkost <eduardo@habkost.net>,
Laurent Vivier <laurent@vivier.eu>
Subject: [PATCH 09/10] fpu: Don't compile-time disable hardfloat for PPC
targets
Date: Mon, 17 Feb 2025 12:50:54 +0000
Message-ID: <20250217125055.160887-10-peter.maydell@linaro.org>
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We happen to know that for the PPC target the FP status flags (and in
particular float_flag_inexact) will always be cleared before a
floating point operation, and so can_use_fpu() will always return
false. So we speed things up a little by forcing QEMU_NO_HARDFLOAT
to true on that target.
We would like to build softfloat once for all targets; that means
removing target-specific ifdefs. Remove the check for TARGET_PPC;
this won't change behaviour because can_use_fpu() will see that
float_flag_inexact is clear and take the softfloat path anyway.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
fpu/softfloat.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index b299cfaf860..b38eea8d879 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -220,11 +220,9 @@ GEN_INPUT_FLUSH3(float64_input_flush3, float64)
* the use of hardfloat, since hardfloat relies on the inexact flag being
* already set.
*/
-#if defined(TARGET_PPC) || defined(__FAST_MATH__)
# if defined(__FAST_MATH__)
# warning disabling hardfloat due to -ffast-math: hardfloat requires an e=
xact \
IEEE implementation
-# endif
# define QEMU_NO_HARDFLOAT 1
# define QEMU_SOFTFLOAT_ATTR QEMU_FLATTEN
#else
--=20
2.43.0