mirror of https://github.com/proxmox/mirror_qemu
target-i386: SSE4.2: fix pcmpXstri instructions
ffs1 returns the first bit set to one starting counting from the most significant bit. pcmpXstri returns the most significant bit set to one, starting counting from the least significant bit. Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>master
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da5156cd9a
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93e3c0ae69
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@ -2099,7 +2099,7 @@ void glue(helper_pcmpestri, SUFFIX)(CPUX86State *env, Reg *d, Reg *s,
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pcmp_elen(env, R_EAX, ctrl));
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if (res) {
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env->regs[R_ECX] = ((ctrl & (1 << 6)) ? rffs1 : ffs1)(res) - 1;
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env->regs[R_ECX] = (ctrl & (1 << 6)) ? rffs1(res) - 1 : 32 - ffs1(res);
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} else {
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env->regs[R_ECX] = 16 >> (ctrl & (1 << 0));
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}
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@ -2137,7 +2137,7 @@ void glue(helper_pcmpistri, SUFFIX)(CPUX86State *env, Reg *d, Reg *s,
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pcmp_ilen(d, ctrl));
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if (res) {
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env->regs[R_ECX] = ((ctrl & (1 << 6)) ? rffs1 : ffs1)(res) - 1;
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env->regs[R_ECX] = (ctrl & (1 << 6)) ? rffs1(res) - 1 : 32 - ffs1(res);
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} else {
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env->regs[R_ECX] = 16 >> (ctrl & (1 << 0));
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}
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