1; RUN: llc < %s -march=x86 -mcpu=yonah | FileCheck %s 2 3define i32 @t1(i32 %x) nounwind { 4 %tmp = tail call i32 @llvm.ctlz.i32( i32 %x ) 5 ret i32 %tmp 6; CHECK: t1: 7; CHECK: bsrl 8; CHECK: cmov 9} 10 11declare i32 @llvm.ctlz.i32(i32) nounwind readnone 12 13define i32 @t2(i32 %x) nounwind { 14 %tmp = tail call i32 @llvm.cttz.i32( i32 %x ) 15 ret i32 %tmp 16; CHECK: t2: 17; CHECK: bsfl 18; CHECK: cmov 19} 20 21declare i32 @llvm.cttz.i32(i32) nounwind readnone 22 23define i16 @t3(i16 %x, i16 %y) nounwind { 24entry: 25 %tmp1 = add i16 %x, %y 26 %tmp2 = tail call i16 @llvm.ctlz.i16( i16 %tmp1 ) ; <i16> [#uses=1] 27 ret i16 %tmp2 28; CHECK: t3: 29; CHECK: bsrw 30; CHECK: cmov 31} 32 33declare i16 @llvm.ctlz.i16(i16) nounwind readnone 34 35; Don't generate the cmovne when the source is known non-zero (and bsr would 36; not set ZF). 37; rdar://9490949 38 39define i32 @t4(i32 %n) nounwind { 40entry: 41; CHECK: t4: 42; CHECK: bsrl 43; CHECK-NOT: cmov 44; CHECK: ret 45 %or = or i32 %n, 1 46 %tmp1 = tail call i32 @llvm.ctlz.i32(i32 %or) 47 ret i32 %tmp1 48} 49