c752bb9203
When reviewing another change, I noticed that we were failing to infer samsign for two cases: 1) an unsigned comparison, and 2) when both arguments were known negative. Using CVP and InstCombine as a reference, we need to be careful to not allow eq/ne comparisons. I'm a bit unclear on the why of that, and for now am going with the low risk change. I may return to investigate that in a follow up. Compile time results look like noise to me, see: https://llvm-compile-time-tracker.com/compare.php?from=49a978712893fcf9e5f40ac488315d029cf15d3d&to=2ddb263604fd7d538e09dc1f805ebc30eb3ffab0&stat=instructions:u
85 lines
3.9 KiB
LLVM
85 lines
3.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes='loop-load-elim,indvars,loop-distribute' -enable-loop-distribute -S %s | FileCheck %s
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define void @test_pr50940(ptr %A, ptr %B) {
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; CHECK-LABEL: @test_pr50940(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[OUTER_HEADER:%.*]]
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; CHECK: outer.header:
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; CHECK-NEXT: br i1 false, label [[OUTER_LATCH:%.*]], label [[INNER_PH:%.*]]
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; CHECK: inner.ph:
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; CHECK-NEXT: [[UGLYGEP:%.*]] = getelementptr i8, ptr [[A:%.*]], i64 4
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; CHECK-NEXT: [[GEP_A_3:%.*]] = getelementptr inbounds i16, ptr [[A]], i64 3
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; CHECK-NEXT: br label [[INNER_LVER_CHECK:%.*]]
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; CHECK: inner.lver.check:
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; CHECK-NEXT: [[UGLYGEP1:%.*]] = getelementptr i8, ptr [[A]], i64 8
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; CHECK-NEXT: [[UGLYGEP2:%.*]] = getelementptr i8, ptr [[B:%.*]], i64 2
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; CHECK-NEXT: [[BOUND0:%.*]] = icmp ult ptr [[UGLYGEP]], [[UGLYGEP2]]
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; CHECK-NEXT: [[BOUND1:%.*]] = icmp ult ptr [[B]], [[UGLYGEP1]]
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; CHECK-NEXT: [[FOUND_CONFLICT:%.*]] = and i1 [[BOUND0]], [[BOUND1]]
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; CHECK-NEXT: br i1 [[FOUND_CONFLICT]], label [[INNER_PH3_LVER_ORIG:%.*]], label [[INNER_PH3_LDIST1:%.*]]
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; CHECK: inner.ph3.lver.orig:
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; CHECK-NEXT: br label [[INNER_LVER_ORIG:%.*]]
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; CHECK: inner.lver.orig:
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; CHECK-NEXT: [[IV_LVER_ORIG:%.*]] = phi i16 [ 0, [[INNER_PH3_LVER_ORIG]] ], [ [[IV_NEXT_LVER_ORIG:%.*]], [[INNER_LVER_ORIG]] ]
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; CHECK-NEXT: [[L_LVER_ORIG:%.*]] = load <2 x i16>, ptr [[UGLYGEP]], align 1
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; CHECK-NEXT: store i16 0, ptr [[GEP_A_3]], align 1
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; CHECK-NEXT: store i16 1, ptr [[B]], align 1
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; CHECK-NEXT: [[IV_NEXT_LVER_ORIG]] = add nuw nsw i16 [[IV_LVER_ORIG]], 1
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; CHECK-NEXT: [[C_1_LVER_ORIG:%.*]] = icmp samesign ult i16 [[IV_LVER_ORIG]], 38
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; CHECK-NEXT: br i1 [[C_1_LVER_ORIG]], label [[INNER_LVER_ORIG]], label [[EXIT_LOOPEXIT:%.*]], !llvm.loop [[LOOP0:![0-9]+]]
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; CHECK: inner.ph3.ldist1:
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; CHECK-NEXT: br label [[INNER_LDIST1:%.*]]
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; CHECK: inner.ldist1:
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; CHECK-NEXT: [[IV_LDIST1:%.*]] = phi i16 [ 0, [[INNER_PH3_LDIST1]] ], [ [[IV_NEXT_LDIST1:%.*]], [[INNER_LDIST1]] ]
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; CHECK-NEXT: [[L_LDIST1:%.*]] = load <2 x i16>, ptr [[UGLYGEP]], align 1, !alias.scope [[META2:![0-9]+]], !noalias [[META5:![0-9]+]]
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; CHECK-NEXT: store i16 0, ptr [[GEP_A_3]], align 1, !alias.scope [[META2]], !noalias [[META5]]
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; CHECK-NEXT: [[IV_NEXT_LDIST1]] = add nuw nsw i16 [[IV_LDIST1]], 1
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; CHECK-NEXT: [[C_1_LDIST1:%.*]] = icmp samesign ult i16 [[IV_LDIST1]], 38
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; CHECK-NEXT: br i1 [[C_1_LDIST1]], label [[INNER_LDIST1]], label [[INNER_PH3:%.*]]
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; CHECK: inner.ph3:
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; CHECK-NEXT: br label [[INNER:%.*]]
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; CHECK: inner:
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; CHECK-NEXT: [[IV:%.*]] = phi i16 [ 0, [[INNER_PH3]] ], [ [[IV_NEXT:%.*]], [[INNER]] ]
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; CHECK-NEXT: store i16 1, ptr [[B]], align 1, !alias.scope [[META5]]
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; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i16 [[IV]], 1
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; CHECK-NEXT: [[C_1:%.*]] = icmp samesign ult i16 [[IV]], 38
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; CHECK-NEXT: br i1 [[C_1]], label [[INNER]], label [[EXIT_LOOPEXIT4:%.*]]
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; CHECK: outer.latch:
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; CHECK-NEXT: br label [[OUTER_HEADER]]
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; CHECK: exit.loopexit:
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; CHECK-NEXT: br label [[EXIT:%.*]]
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; CHECK: exit.loopexit4:
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; CHECK-NEXT: br label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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%gep.A.1 = getelementptr inbounds i16, ptr %A, i64 1
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br label %outer.header
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outer.header:
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%gep.A.2 = getelementptr inbounds i16, ptr %gep.A.1, i64 1
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br i1 false, label %outer.latch, label %inner.ph
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inner.ph: ; preds = %for.body5
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%lcssa.gep = phi ptr [ %gep.A.2, %outer.header ]
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%gep.A.3 = getelementptr inbounds i16, ptr %A, i64 3
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br label %inner
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inner:
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%iv = phi i16 [ 0, %inner.ph ], [ %iv.next, %inner ]
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%l = load <2 x i16>, ptr %lcssa.gep, align 1
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store i16 0, ptr %gep.A.3, align 1
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store i16 1, ptr %B, align 1
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%iv.next = add nuw nsw i16 %iv, 1
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%c.1 = icmp ult i16 %iv, 38
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br i1 %c.1, label %inner, label %exit
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outer.latch:
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br label %outer.header
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exit:
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ret void
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}
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