| ; RUN: opt -passes=loop-load-elim -S < %s | FileCheck %s |
| |
| ; No loop-carried forwarding: The intervening store to A[i] kills the stored |
| ; value from the previous iteration. |
| ; |
| ; for (unsigned i = 0; i < 100; i++) { |
| ; A[i] = 1; |
| ; A[i+1] = A[i] + B[i]; |
| ; } |
| |
| target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" |
| |
| define void @f(ptr noalias nocapture %A, ptr noalias nocapture readonly %B, i64 %N) { |
| entry: |
| br label %for.body |
| |
| for.body: ; preds = %for.body, %entry |
| ; CHECK-NOT: %store_forwarded |
| %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] |
| %arrayidx = getelementptr inbounds i32, ptr %A, i64 %indvars.iv |
| store i32 1, ptr %arrayidx, align 4 |
| %a = load i32, ptr %arrayidx, align 4 |
| %arrayidxB = getelementptr inbounds i32, ptr %B, i64 %indvars.iv |
| %b = load i32, ptr %arrayidxB, align 4 |
| ; CHECK: %add = add i32 %b, %a |
| %add = add i32 %b, %a |
| %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 |
| %arrayidx_next = getelementptr inbounds i32, ptr %A, i64 %indvars.iv.next |
| store i32 %add, ptr %arrayidx_next, align 4 |
| %exitcond = icmp eq i64 %indvars.iv.next, %N |
| br i1 %exitcond, label %for.end, label %for.body |
| |
| for.end: ; preds = %for.body |
| ret void |
| } |