1 ; RUN: llc < %s -march=x86 -mcpu=yonah | FileCheck %s 2 ; rdar://5752025 3 4 ; We want: 5 ; CHECK: movl $42, %ecx 6 ; CHECK-NEXT: movl 4(%esp), %eax 7 ; CHECK-NEXT: andl $15, %eax 8 ; CHECK-NEXT: cmovnel %ecx, %eax 9 ; CHECK-NEXT: ret 10 ; 11 ; We don't want: 12 ; movl 4(%esp), %eax 13 ; movl %eax, %ecx # bad: extra copy 14 ; andl $15, %ecx 15 ; testl $15, %eax # bad: peep obstructed 16 ; movl $42, %eax 17 ; cmovel %ecx, %eax 18 ; ret 19 ; 20 ; We also don't want: 21 ; movl $15, %ecx # bad: larger encoding 22 ; andl 4(%esp), %ecx 23 ; movl $42, %eax 24 ; cmovel %ecx, %eax 25 ; ret 26 ; 27 ; We also don't want: 28 ; movl 4(%esp), %ecx 29 ; andl $15, %ecx 30 ; testl %ecx, %ecx # bad: unnecessary test 31 ; movl $42, %eax 32 ; cmovel %ecx, %eax 33 ; ret 34 35 define i32 @t1(i32 %X) nounwind { 36 entry: 37 %tmp2 = and i32 %X, 15 ; <i32> [#uses=2] 38 %tmp4 = icmp eq i32 %tmp2, 0 ; <i1> [#uses=1] 39 %retval = select i1 %tmp4, i32 %tmp2, i32 42 ; <i32> [#uses=1] 40 ret i32 %retval 41 } 42 43
