1 ; RUN: opt -basicaa -loop-idiom < %s -S | FileCheck %s 2 target 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-n8:16:32:64" 3 4 ; CHECK @.memset_pattern = private unnamed_addr constant [4 x i32] [i32 2, i32 2, i32 2, i32 2], align 16 5 6 target triple = "x86_64-apple-darwin10.0.0" 7 8 ;void test(int *f, unsigned n) { 9 ; for (unsigned i = 0; i < 2 * n; i += 2) { 10 ; f[i] = 0; 11 ; f[i+1] = 0; 12 ; } 13 ;} 14 define void @test(i32* %f, i32 %n) nounwind ssp { 15 entry: 16 %mul = shl i32 %n, 1 17 %cmp1 = icmp eq i32 %mul, 0 18 br i1 %cmp1, label %for.end, label %for.body.preheader 19 20 for.body.preheader: ; preds = %entry 21 %0 = zext i32 %mul to i64 22 br label %for.body 23 24 for.body: ; preds = %for.body.preheader, %for.body 25 %indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ] 26 %arrayidx = getelementptr inbounds i32, i32* %f, i64 %indvars.iv 27 store i32 0, i32* %arrayidx, align 4 28 %1 = or i64 %indvars.iv, 1 29 %arrayidx2 = getelementptr inbounds i32, i32* %f, i64 %1 30 store i32 0, i32* %arrayidx2, align 4 31 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 2 32 %cmp = icmp ult i64 %indvars.iv.next, %0 33 br i1 %cmp, label %for.body, label %for.end.loopexit 34 35 for.end.loopexit: ; preds = %for.body 36 br label %for.end 37 38 for.end: ; preds = %for.end.loopexit, %entry 39 ret void 40 ; CHECK-LABEL: @test( 41 ; CHECK: call void @llvm.memset 42 ; CHECK-NOT: store 43 } 44 45 ;void test_pattern(int *f, unsigned n) { 46 ; for (unsigned i = 0; i < 2 * n; i += 2) { 47 ; f[i] = 2; 48 ; f[i+1] = 2; 49 ; } 50 ;} 51 define void @test_pattern(i32* %f, i32 %n) nounwind ssp { 52 entry: 53 %mul = shl i32 %n, 1 54 %cmp1 = icmp eq i32 %mul, 0 55 br i1 %cmp1, label %for.end, label %for.body.preheader 56 57 for.body.preheader: ; preds = %entry 58 %0 = zext i32 %mul to i64 59 br label %for.body 60 61 for.body: ; preds = %for.body.preheader, %for.body 62 %indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ] 63 %arrayidx = getelementptr inbounds i32, i32* %f, i64 %indvars.iv 64 store i32 2, i32* %arrayidx, align 4 65 %1 = or i64 %indvars.iv, 1 66 %arrayidx2 = getelementptr inbounds i32, i32* %f, i64 %1 67 store i32 2, i32* %arrayidx2, align 4 68 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 2 69 %cmp = icmp ult i64 %indvars.iv.next, %0 70 br i1 %cmp, label %for.body, label %for.end.loopexit 71 72 for.end.loopexit: ; preds = %for.body 73 br label %for.end 74 75 for.end: ; preds = %for.end.loopexit, %entry 76 ret void 77 ; CHECK-LABEL: @test_pattern( 78 ; CHECK: call void @memset_pattern16 79 ; CHECK-NOT: store 80 } 81
