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target-s390x: Use clz opcode 

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2016-11-16 11:30:34 +01:00
parent 9b8514e56e
commit 0f9712b117
3 changed files with 1 additions and 8 deletions
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1
target/s390x/helper.h
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@ -70,7 +70,6 @@ DEF_HELPER_FLAGS_4(msdb, TCG_CALL_NO_WG, i64, env, i64, i64, i64)
DEF_HELPER_FLAGS_3(tceb, TCG_CALL_NO_RWG_SE, i32, env, i64, i64) DEF_HELPER_FLAGS_3(tceb, TCG_CALL_NO_RWG_SE, i32, env, i64, i64)
DEF_HELPER_FLAGS_3(tcdb, TCG_CALL_NO_RWG_SE, i32, env, i64, i64) DEF_HELPER_FLAGS_3(tcdb, TCG_CALL_NO_RWG_SE, i32, env, i64, i64)
DEF_HELPER_FLAGS_4(tcxb, TCG_CALL_NO_RWG_SE, i32, env, i64, i64, i64) DEF_HELPER_FLAGS_4(tcxb, TCG_CALL_NO_RWG_SE, i32, env, i64, i64, i64)
DEF_HELPER_FLAGS_1(clz, TCG_CALL_NO_RWG_SE, i64, i64)
DEF_HELPER_FLAGS_2(sqeb, TCG_CALL_NO_WG, i64, env, i64) DEF_HELPER_FLAGS_2(sqeb, TCG_CALL_NO_WG, i64, env, i64)
DEF_HELPER_FLAGS_2(sqdb, TCG_CALL_NO_WG, i64, env, i64) DEF_HELPER_FLAGS_2(sqdb, TCG_CALL_NO_WG, i64, env, i64)
DEF_HELPER_FLAGS_3(sqxb, TCG_CALL_NO_WG, i64, env, i64, i64) DEF_HELPER_FLAGS_3(sqxb, TCG_CALL_NO_WG, i64, env, i64, i64)

6
target/s390x/int_helper.c
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@ -117,12 +117,6 @@ uint64_t HELPER(divu64)(CPUS390XState *env, uint64_t ah, uint64_t al,
return ret; return ret;
} }
/* count leading zeros, for find leftmost one */
uint64_t HELPER(clz)(uint64_t v)
{
return clz64(v);
}
uint64_t HELPER(cvd)(int32_t reg) uint64_t HELPER(cvd)(int32_t reg)
{ {
/* positive 0 */ /* positive 0 */

2
target/s390x/translate.c
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@ -2249,7 +2249,7 @@ static ExitStatus op_flogr(DisasContext *s, DisasOps *o)
gen_op_update1_cc_i64(s, CC_OP_FLOGR, o->in2); gen_op_update1_cc_i64(s, CC_OP_FLOGR, o->in2);
/* R1 = IN ? CLZ(IN) : 64. */ /* R1 = IN ? CLZ(IN) : 64. */
gen_helper_clz(o->out, o->in2); tcg_gen_clzi_i64(o->out, o->in2, 64);
/* R1+1 = IN & ~(found bit). Note that we may attempt to shift this /* R1+1 = IN & ~(found bit). Note that we may attempt to shift this
value by 64, which is undefined. But since the shift is 64 iff the value by 64, which is undefined. But since the shift is 64 iff the