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fpu: Don't compile-time disable hardfloat for PPC targets

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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>
Message-id: 20250224111524.1101196-12-peter.maydell@linaro.org
Message-id: 20250217125055.160887-10-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2025-02-24 11:15:23 +00:00
parent 3abed4d0ea
commit c5d4173fcf
1 changed files with 0 additions and 2 deletions
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2
fpu/softfloat.c
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@ -220,11 +220,9 @@ GEN_INPUT_FLUSH3(float64_input_flush3, float64)
* the use of hardfloat, since hardfloat relies on the inexact flag being * the use of hardfloat, since hardfloat relies on the inexact flag being
* already set. * already set.
*/ */
#if defined(TARGET_PPC) || defined(__FAST_MATH__)
# if defined(__FAST_MATH__) # if defined(__FAST_MATH__)
# warning disabling hardfloat due to -ffast-math: hardfloat requires an exact \ # warning disabling hardfloat due to -ffast-math: hardfloat requires an exact \
IEEE implementation IEEE implementation
# endif
# define QEMU_NO_HARDFLOAT 1 # define QEMU_NO_HARDFLOAT 1
# define QEMU_SOFTFLOAT_ATTR QEMU_FLATTEN # define QEMU_SOFTFLOAT_ATTR QEMU_FLATTEN
#else #else