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target/loongarch: Remove cpu_fcsr0

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All of the fpu operations are defined with TCG_CALL_NO_WG, but they
all modify FCSR0.  The most efficient way to fix this is to remove
cpu_fcsr0, and instead use explicit load and store operations for the
two instructions that manipulate that value.

Acked-by: Qi Hu <huqi@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Reported-by: Feiyang Chen <chenfeiyang@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-08-06 10:04:44 -07:00
parent 7b06148df8
commit 10dcb08b03
6 changed files with 36 additions and 22 deletions
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4
target/loongarch/fpu_helper.c
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@ -872,8 +872,8 @@ uint64_t helper_ftint_w_d(CPULoongArchState *env, uint64_t fj)
return fd;
}
void helper_set_rounding_mode(CPULoongArchState *env, uint32_t fcsr0)
void helper_set_rounding_mode(CPULoongArchState *env)
{
set_float_rounding_mode(ieee_rm[(fcsr0 >> FCSR0_RM) & 0x3],
set_float_rounding_mode(ieee_rm[(env->fcsr0 >> FCSR0_RM) & 0x3],
&env->fp_status);
}