1 ; RUN: opt -loop-distribute -verify-loop-info -verify-dom-info -S < %s \ 2 ; RUN: | FileCheck %s 3 4 ; Check that definitions used outside the loop are handled correctly: (1) they 5 ; are not dropped (2) when version the loop, a phi is added to merge the value 6 ; from the non-distributed loop and the distributed loop. 7 ; 8 ; for (i = 0; i < n; i++) { 9 ; A[i + 1] = A[i] * B[i]; 10 ; ========================== 11 ; sum += C[i]; 12 ; } 13 14 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" 15 target triple = "x86_64-apple-macosx10.10.0" 16 17 @B = common global i32* null, align 8 18 @A = common global i32* null, align 8 19 @C = common global i32* null, align 8 20 @D = common global i32* null, align 8 21 @E = common global i32* null, align 8 22 @SUM = common global i32 0, align 8 23 24 define void @f() { 25 entry: 26 %a = load i32*, i32** @A, align 8 27 %b = load i32*, i32** @B, align 8 28 %c = load i32*, i32** @C, align 8 29 %d = load i32*, i32** @D, align 8 30 %e = load i32*, i32** @E, align 8 31 32 br label %for.body 33 34 ; CHECK: for.body.ldist1: 35 ; CHECK: %mulA.ldist1 = mul i32 %loadB.ldist1, %loadA.ldist1 36 ; CHECK: for.body.ph: 37 ; CHECK: for.body: 38 ; CHECK: %sum_add = add nuw nsw i32 %sum, %loadC 39 ; CHECK: for.end: 40 ; CHECK: %sum_add.lver = phi i32 [ %sum_add, %for.body ], [ %sum_add.lver.orig, %for.body.lver.orig ] 41 42 for.body: ; preds = %for.body, %entry 43 %ind = phi i64 [ 0, %entry ], [ %add, %for.body ] 44 %sum = phi i32 [ 0, %entry ], [ %sum_add, %for.body ] 45 46 %arrayidxA = getelementptr inbounds i32, i32* %a, i64 %ind 47 %loadA = load i32, i32* %arrayidxA, align 4 48 49 %arrayidxB = getelementptr inbounds i32, i32* %b, i64 %ind 50 %loadB = load i32, i32* %arrayidxB, align 4 51 52 %mulA = mul i32 %loadB, %loadA 53 54 %add = add nuw nsw i64 %ind, 1 55 %arrayidxA_plus_4 = getelementptr inbounds i32, i32* %a, i64 %add 56 store i32 %mulA, i32* %arrayidxA_plus_4, align 4 57 58 %arrayidxC = getelementptr inbounds i32, i32* %c, i64 %ind 59 %loadC = load i32, i32* %arrayidxC, align 4 60 61 %sum_add = add nuw nsw i32 %sum, %loadC 62 63 %exitcond = icmp eq i64 %add, 20 64 br i1 %exitcond, label %for.end, label %for.body 65 66 for.end: ; preds = %for.body 67 store i32 %sum_add, i32* @SUM, align 4 68 ret void 69 } 70
