derek.holloway
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122 lines
4.2 KiB
LLVM
122 lines
4.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals
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; RUN: opt -S -passes=jump-threading < %s | FileCheck %s
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; Threading a loop exit (via cloneInstructions) must clone the block's noalias
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; scope declarations so the threaded copy does not share the original's scopes.
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define void @test(ptr %ptr) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void @llvm.experimental.noalias.scope.decl(metadata [[META0:![0-9]+]])
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[I_INC:%.*]], [[LATCH:%.*]] ]
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; CHECK-NEXT: [[C:%.*]] = icmp eq i32 [[I]], 100
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; CHECK-NEXT: br i1 [[C]], label [[EXIT:%.*]], label [[LATCH]]
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; CHECK: latch:
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; CHECK-NEXT: call void @llvm.experimental.noalias.scope.decl(metadata [[META3:![0-9]+]])
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; CHECK-NEXT: store i8 0, ptr [[PTR:%.*]], align 1, !noalias [[META0]]
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; CHECK-NEXT: store i8 1, ptr [[PTR]], align 1, !noalias [[META3]]
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; CHECK-NEXT: [[I_INC]] = add i32 [[I]], 1
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; CHECK-NEXT: br label [[LOOP]]
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; CHECK: exit:
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; CHECK-NEXT: call void @llvm.experimental.noalias.scope.decl(metadata [[META5:![0-9]+]])
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; CHECK-NEXT: store i8 0, ptr [[PTR]], align 1, !noalias [[META0]]
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; CHECK-NEXT: store i8 1, ptr [[PTR]], align 1, !noalias [[META5]]
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; CHECK-NEXT: ret void
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;
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entry:
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call void @llvm.experimental.noalias.scope.decl(metadata !0)
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br label %loop
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loop:
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%i = phi i32 [ 0, %entry ], [ %i.inc, %latch ]
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%c = icmp eq i32 %i, 100
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br i1 %c, label %if, label %latch
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if:
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br label %latch
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latch:
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%p = phi i1 [ true, %if ], [ false, %loop ]
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call void @llvm.experimental.noalias.scope.decl(metadata !3)
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store i8 0, ptr %ptr, !noalias !0
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store i8 1, ptr %ptr, !noalias !3
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%i.inc = add i32 %i, 1
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br i1 %p, label %exit, label %loop
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exit:
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ret void
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}
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; duplicateCondBranchOnPHIIntoPred duplicates a block whose conditional branch
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; is on a PHI of non-constant values into a predecessor. It must likewise clone
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; the block's noalias scope declarations, otherwise the duplicate shares the
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; original's scope MDNodes and alias analysis can wrongly conclude two accesses
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; on different paths do not alias.
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define void @dup_clones_noalias_scope(ptr %p) {
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; CHECK-LABEL: @dup_clones_noalias_scope(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[C:%.*]] = call i1 @opaque()
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; CHECK-NEXT: br i1 [[C]], label [[PRED:%.*]], label [[BB:%.*]]
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; CHECK: pred:
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; CHECK-NEXT: [[PV:%.*]] = call i1 @opaque()
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; CHECK-NEXT: call void @llvm.experimental.noalias.scope.decl(metadata [[META7:![0-9]+]])
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; CHECK-NEXT: store i8 0, ptr [[P:%.*]], align 1, !noalias [[META7]]
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; CHECK-NEXT: br i1 [[PV]], label [[TB:%.*]], label [[FB:%.*]]
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; CHECK: bb:
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; CHECK-NEXT: [[OV:%.*]] = call i1 @opaque()
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; CHECK-NEXT: call void @llvm.experimental.noalias.scope.decl(metadata [[META0]])
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; CHECK-NEXT: store i8 0, ptr [[P]], align 1, !noalias [[META0]]
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; CHECK-NEXT: br i1 [[OV]], label [[TB]], label [[FB]]
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; CHECK: tb:
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; CHECK-NEXT: ret void
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; CHECK: fb:
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; CHECK-NEXT: ret void
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;
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entry:
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%c = call i1 @opaque()
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br i1 %c, label %pred, label %other
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pred:
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%pv = call i1 @opaque()
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br label %bb
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other:
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%ov = call i1 @opaque()
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br label %bb
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bb:
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%x = phi i1 [ %pv, %pred ], [ %ov, %other ]
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call void @llvm.experimental.noalias.scope.decl(metadata !0)
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store i8 0, ptr %p, !noalias !0
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br i1 %x, label %tb, label %fb
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tb:
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ret void
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fb:
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ret void
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}
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declare i1 @opaque()
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declare void @llvm.experimental.noalias.scope.decl(metadata)
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!0 = !{!1}
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!1 = distinct !{!1, !2, !"scope1"}
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!2 = distinct !{!2, !"domain"}
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!3 = !{!4}
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!4 = distinct !{!4, !2, !"scope2"}
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;.
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; CHECK: attributes #[[ATTR0:[0-9]+]] = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: readwrite) }
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;.
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; CHECK: [[META0]] = !{[[META1:![0-9]+]]}
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; CHECK: [[META1]] = distinct !{[[META1]], [[META2:![0-9]+]], !"scope1"}
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; CHECK: [[META2]] = distinct !{[[META2]], !"domain"}
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; CHECK: [[META3]] = !{[[META4:![0-9]+]]}
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; CHECK: [[META4]] = distinct !{[[META4]], [[META2]], !"scope2"}
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; CHECK: [[META5]] = !{[[META6:![0-9]+]]}
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; CHECK: [[META6]] = distinct !{[[META6]], [[META2]], !"scope2:thread"}
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; CHECK: [[META7]] = !{[[META8:![0-9]+]]}
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; CHECK: [[META8]] = distinct !{[[META8]], [[META2]], !"scope1:thread"}
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;.
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