1; RUN: llc < %s -o - | FileCheck %s 2target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128" 3target triple = "x86_64-apple-darwin9" 4 5; The comparison happens before the relevant use, but it can still be rewritten 6; to compare with zero. 7 8; CHECK-LABEL: foo: 9; CHECK: align 10; CHECK: incl %eax 11; CHECK-NEXT: decl %ecx 12; CHECK-NEXT: jne 13 14define void @foo() nounwind { 15entry: 16 br label %loop 17 18loop: 19 %indvar = phi i32 [ 0, %entry ], [ %i.2.0.us1534, %loop ] ; <i32> [#uses=1] 20 %i.2.0.us1534 = add i32 %indvar, 1 ; <i32> [#uses=3] 21 %tmp611.us1535 = icmp eq i32 %i.2.0.us1534, 4 ; <i1> [#uses=2] 22 %tmp623.us1538 = select i1 %tmp611.us1535, i32 6, i32 0 ; <i32> [#uses=0] 23 %tmp628.us1540 = shl i32 %i.2.0.us1534, 1 ; <i32> [#uses=1] 24 %tmp645646647.us1547 = sext i32 %tmp628.us1540 to i64 ; <i64> [#uses=0] 25 br i1 %tmp611.us1535, label %exit, label %loop 26 27exit: 28 ret void 29} 30