After:
lock negl -0x14(%rbp)
pushf
pop %rax
%rax will contain the wrong value because the "lock neg" calculates the
wrong eflags. Simple test:
#include <assert.h>
int main()
{
__volatile__ unsigned test = 0x2363a;
__volatile__ char cond = 0;
asm(
"lock negl %0 \n\t"
"sets %1"
: "=m"(test), "=r"(cond));
assert(cond & 1);
return 0;
}
Reported-by: Jinyang Shen <shenjinyang@loongson.cn>
Co-Developed-by: Xuehai Chen <chenxuehai@loongson.cn>
Signed-off-by: Xuehai Chen <chenxuehai@loongson.cn>
Signed-off-by: Qi Hu <huqi@loongson.cn>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
tcg_temp_free(t2);
tcg_temp_free(a0);
- tcg_gen_mov_tl(s->T0, t0);
+ tcg_gen_neg_tl(s->T0, t0);
tcg_temp_free(t0);
} else {
tcg_gen_neg_tl(s->T0, s->T0);