| ; RUN: opt -loop-distribute -enable-loop-distribute -verify-loop-info -verify-dom-info -S < %s \ |
| ; RUN: | FileCheck %s |
| |
| ; Check that definitions used outside the loop are handled correctly: (1) they |
| ; are not dropped (2) when version the loop, a phi is added to merge the value |
| ; from the non-distributed loop and the distributed loop. |
| ; |
| ; for (i = 0; i < n; i++) { |
| ; A[i + 1] = A[i] * B[i]; |
| ; ========================== |
| ; sum += C[i]; |
| ; } |
| |
| target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-apple-macosx10.10.0" |
| |
| @B = common global i32* null, align 8 |
| @A = common global i32* null, align 8 |
| @C = common global i32* null, align 8 |
| @D = common global i32* null, align 8 |
| @E = common global i32* null, align 8 |
| @SUM = common global i32 0, align 8 |
| |
| define void @f() { |
| entry: |
| %a = load i32*, i32** @A, align 8 |
| %b = load i32*, i32** @B, align 8 |
| %c = load i32*, i32** @C, align 8 |
| %d = load i32*, i32** @D, align 8 |
| %e = load i32*, i32** @E, align 8 |
| |
| br label %for.body |
| |
| ; CHECK: for.body.ldist1: |
| ; CHECK: %mulA.ldist1 = mul i32 %loadB.ldist1, %loadA.ldist1 |
| ; CHECK: for.body.ph: |
| ; CHECK: for.body: |
| ; CHECK: %sum_add = add nuw nsw i32 %sum, %loadC |
| ; CHECK: for.end: |
| ; CHECK: %sum_add.lver = phi i32 [ %sum_add, %for.body ], [ %sum_add.lver.orig, %for.body.lver.orig ] |
| |
| for.body: ; preds = %for.body, %entry |
| %ind = phi i64 [ 0, %entry ], [ %add, %for.body ] |
| %sum = phi i32 [ 0, %entry ], [ %sum_add, %for.body ] |
| |
| %arrayidxA = getelementptr inbounds i32, i32* %a, i64 %ind |
| %loadA = load i32, i32* %arrayidxA, align 4 |
| |
| %arrayidxB = getelementptr inbounds i32, i32* %b, i64 %ind |
| %loadB = load i32, i32* %arrayidxB, align 4 |
| |
| %mulA = mul i32 %loadB, %loadA |
| |
| %add = add nuw nsw i64 %ind, 1 |
| %arrayidxA_plus_4 = getelementptr inbounds i32, i32* %a, i64 %add |
| store i32 %mulA, i32* %arrayidxA_plus_4, align 4 |
| |
| %arrayidxC = getelementptr inbounds i32, i32* %c, i64 %ind |
| %loadC = load i32, i32* %arrayidxC, align 4 |
| |
| %sum_add = add nuw nsw i32 %sum, %loadC |
| |
| %exitcond = icmp eq i64 %add, 20 |
| br i1 %exitcond, label %for.end, label %for.body |
| |
| for.end: ; preds = %for.body |
| store i32 %sum_add, i32* @SUM, align 4 |
| ret void |
| } |