| ; RUN: opt -passes=loop-distribute -enable-loop-distribute -verify-loop-info -verify-dom-info -S \ |
| ; RUN: < %s | FileCheck %s |
| |
| target datalayout = "e-m:o-i32:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-apple-macosx10.10.0" |
| |
| ; NOTE: The tests below use infinite loops to force unknown backedge-taken counts. |
| ; Making the exit condition depend on a load would break current loop-distribute, |
| ; because it requires all accesses to end up in either of the loops, but not both. |
| |
| ; TODO |
| ; Can distribute with unknown backedge-taken count, because no runtime checks are |
| ; required. |
| define void @unknown_btc_distribute_no_checks_needed(ptr noalias %a, |
| ptr noalias %c, |
| ptr noalias %d) { |
| ; CHECK-LABEL: @unknown_btc_distribute_no_checks_needed( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label %for.body |
| ; |
| entry: |
| br label %for.body |
| |
| for.body: ; preds = %for.body, %entry |
| %ind = phi i32 [ 0, %entry ], [ %add, %for.body ] |
| |
| %arrayidxA = getelementptr inbounds i32, ptr %a, i32 %ind |
| %loadA = load i32, ptr %arrayidxA, align 4 |
| |
| %mulA = mul i32 %loadA, 10 |
| |
| %add = add nuw nsw i32 %ind, 1 |
| %arrayidxA_plus_4 = getelementptr inbounds i32, ptr %a, i32 %add |
| store i32 %mulA, ptr %arrayidxA_plus_4, align 4 |
| |
| %arrayidxD = getelementptr inbounds i32, ptr %d, i32 %ind |
| %loadD = load i32, ptr %arrayidxD, align 4 |
| |
| %mulC = mul i32 %loadD, 20 |
| |
| %arrayidxC = getelementptr inbounds i32, ptr %c, i32 %ind |
| store i32 %mulC, ptr %arrayidxC, align 4 |
| |
| br i1 false, label %for.end, label %for.body |
| |
| for.end: ; preds = %for.body |
| ret void |
| } |
| |
| ; Cannot distribute with unknown backedge-taken count, because runtime checks for |
| ; induction wrapping are required. |
| define void @unknown_btc_do_not_distribute_wrapping_checks(ptr noalias %a, |
| ptr noalias %c, |
| ptr noalias %d) { |
| ; CHECK-LABEL: @unknown_btc_do_not_distribute_wrapping_checks( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label %for.body |
| ; |
| entry: |
| br label %for.body |
| |
| for.body: ; preds = %for.body, %entry |
| %ind = phi i32 [ 0, %entry ], [ %add, %for.body ] |
| |
| %arrayidxA = getelementptr inbounds i32, ptr %a, i32 %ind |
| %loadA = load i32, ptr %arrayidxA, align 4 |
| |
| %mulA = mul i32 %loadA, 10 |
| |
| %add = add i32 %ind, 1 |
| %arrayidxA_plus_4 = getelementptr inbounds i32, ptr %a, i32 %add |
| store i32 %mulA, ptr %arrayidxA_plus_4, align 4 |
| |
| %arrayidxD = getelementptr inbounds i32, ptr %d, i32 %ind |
| %loadD = load i32, ptr %arrayidxD, align 4 |
| |
| %mulC = mul i32 %loadD, 20 |
| |
| %arrayidxC = getelementptr inbounds i32, ptr %c, i32 %ind |
| store i32 %mulC, ptr %arrayidxC, align 4 |
| |
| br i1 false, label %for.end, label %for.body |
| |
| for.end: ; preds = %for.body |
| ret void |
| } |