1 ; RUN: opt -S -loop-vectorize -force-vector-unroll=1 -force-vector-width=4 -dce -instcombine < %s | FileCheck %s 2 3 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-S128" 4 target triple = "x86_64-apple-macosx10.8.0" 5 6 @uf = common global [100 x i32] zeroinitializer, align 16 7 @xi = common global [100 x i32] zeroinitializer, align 16 8 @q = common global [100 x i32] zeroinitializer, align 16 9 10 ; PR16455 11 12 13 ; Due to a bug in the way we handled reverse induction stores we would generate 14 ; a shuffle too many. 15 16 define void @t() { 17 entry: 18 br label %for.body 19 20 ; CHECK-LABEL: @t( 21 ; CHECK: vector.body: 22 ; CHECK: load <4 x i32> 23 ; CHECK: [[VAR1:%[a-zA-Z0-9]+]] = shufflevector 24 ; CHECK: load <4 x i32> 25 ; CHECK: [[VAR2:%[a-zA-Z0-9]+]] = shufflevector 26 ; CHECK: [[VAR3:%[a-zA-Z0-9]+]] = add nsw <4 x i32> [[VAR2]], [[VAR1]] 27 ; CHECK: [[VAR4:%[a-zA-Z0-9]+]] = shufflevector <4 x i32> [[VAR3]] 28 ; CHECK: store <4 x i32> [[VAR4]] 29 ; CHECK: load <4 x i32> 30 ; CHECK: [[VAR5:%[a-zA-Z0-9]+]] = shufflevector 31 ; CHECK-NOT: add nsw <4 x i32> [[VAR4]], [[VAR5]] 32 ; CHECK-NOT: add nsw <4 x i32> [[VAR5]], [[VAR4]] 33 ; CHECK: add nsw <4 x i32> [[VAR3]], [[VAR5]] 34 35 for.body: 36 %indvars.iv = phi i64 [ 93, %entry ], [ %indvars.iv.next, %for.body ] 37 %0 = add i64 %indvars.iv, 1 38 %arrayidx = getelementptr inbounds [100 x i32]* @uf, i64 0, i64 %0 39 %arrayidx3 = getelementptr inbounds [100 x i32]* @xi, i64 0, i64 %0 40 %1 = load i32* %arrayidx3, align 4 41 %2 = load i32* %arrayidx, align 4 42 %add4 = add nsw i32 %2, %1 43 store i32 %add4, i32* %arrayidx, align 4 44 %arrayidx7 = getelementptr inbounds [100 x i32]* @q, i64 0, i64 %0 45 %3 = load i32* %arrayidx7, align 4 46 %add8 = add nsw i32 %add4, %3 47 store i32 %add8, i32* %arrayidx, align 4 48 %indvars.iv.next = add i64 %indvars.iv, -1 49 %4 = trunc i64 %indvars.iv.next to i32 50 %cmp = icmp ugt i32 %4, 2 51 br i1 %cmp, label %for.body, label %for.end 52 53 for.end: 54 ret void 55 } 56
