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target-i386: update fp status fix

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This patch introduces cpu_set_fpuc() function, which changes fpuc field
of the CPU state and calls update_fp_status() function.
These calls update status of softfloat library and prevent bugs caused
by non-coherent rounding settings of the FPU and softfloat.

v2 changes:
 * Added missed calls and intoduced setter function (as suggested by TeLeMan)

Reviewed-by: TeLeMan <geleman@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
This commit is contained in:
Pavel Dovgalyuk 2014-09-17 12:05:19 +04:00 • committed by Paolo Bonzini
parent 7dbb4c49bf
commit 5bde14078d
5 changed files with 18 additions and 11 deletions
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2
target-i386/cpu.c
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@ -2580,7 +2580,7 @@ static void x86_cpu_reset(CPUState *s)
for (i = 0; i < 8; i++) {
env->fptags[i] = 1;
}
env->fpuc = 0x37f;
cpu_set_fpuc(env, 0x37f);
env->mxcsr = 0x1f80;
env->xstate_bv = XSTATE_FP | XSTATE_SSE;