1 ; RUN: llc < %s -march=x86-64 -mcpu=yonah | FileCheck %s
3 declare i8 @llvm.cttz.i8(i8, i1)
4 declare i16 @llvm.cttz.i16(i16, i1)
5 declare i32 @llvm.cttz.i32(i32, i1)
6 declare i64 @llvm.cttz.i64(i64, i1)
7 declare i8 @llvm.ctlz.i8(i8, i1)
8 declare i16 @llvm.ctlz.i16(i16, i1)
9 declare i32 @llvm.ctlz.i32(i32, i1)
10 declare i64 @llvm.ctlz.i64(i64, i1)
12 define i8 @cttz_i8(i8 %x) {
13 %tmp = call i8 @llvm.cttz.i8( i8 %x, i1 true )
15 ; CHECK-LABEL: cttz_i8:
21 define i16 @cttz_i16(i16 %x) {
22 %tmp = call i16 @llvm.cttz.i16( i16 %x, i1 true )
24 ; CHECK-LABEL: cttz_i16:
30 define i32 @cttz_i32(i32 %x) {
31 %tmp = call i32 @llvm.cttz.i32( i32 %x, i1 true )
33 ; CHECK-LABEL: cttz_i32:
39 define i64 @cttz_i64(i64 %x) {
40 %tmp = call i64 @llvm.cttz.i64( i64 %x, i1 true )
42 ; CHECK-LABEL: cttz_i64:
48 define i8 @ctlz_i8(i8 %x) {
50 %tmp2 = call i8 @llvm.ctlz.i8( i8 %x, i1 true )
52 ; CHECK-LABEL: ctlz_i8:
59 define i16 @ctlz_i16(i16 %x) {
61 %tmp2 = call i16 @llvm.ctlz.i16( i16 %x, i1 true )
63 ; CHECK-LABEL: ctlz_i16:
70 define i32 @ctlz_i32(i32 %x) {
71 %tmp = call i32 @llvm.ctlz.i32( i32 %x, i1 true )
73 ; CHECK-LABEL: ctlz_i32:
80 define i64 @ctlz_i64(i64 %x) {
81 %tmp = call i64 @llvm.ctlz.i64( i64 %x, i1 true )
83 ; CHECK-LABEL: ctlz_i64:
90 define i32 @ctlz_i32_cmov(i32 %n) {
92 ; Generate a cmov to handle zero inputs when necessary.
93 ; CHECK-LABEL: ctlz_i32_cmov:
98 %tmp1 = call i32 @llvm.ctlz.i32(i32 %n, i1 false)
102 define i32 @ctlz_i32_fold_cmov(i32 %n) {
104 ; Don't generate the cmovne when the source is known non-zero (and bsr would
107 ; CHECK-LABEL: ctlz_i32_fold_cmov:
113 %tmp1 = call i32 @llvm.ctlz.i32(i32 %or, i1 false)
117 define i32 @ctlz_bsr(i32 %n) {
119 ; Don't generate any xors when a 'ctlz' intrinsic is actually used to compute
120 ; the most significant bit, which is what 'bsr' does natively.
121 ; CHECK-LABEL: ctlz_bsr:
125 %ctlz = call i32 @llvm.ctlz.i32(i32 %n, i1 true)
126 %bsr = xor i32 %ctlz, 31
130 define i32 @ctlz_bsr_cmov(i32 %n) {
132 ; Same as ctlz_bsr, but ensure this happens even when there is a potential
134 ; CHECK-LABEL: ctlz_bsr_cmov:
138 %ctlz = call i32 @llvm.ctlz.i32(i32 %n, i1 false)
139 %bsr = xor i32 %ctlz, 31