derek.holloway
7502bf64a4
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93 lines
2.6 KiB
LLVM
93 lines
2.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=sink -S < %s | FileCheck %s
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; Loads marked invariant can be sunk across critical edges.
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define <4 x float> @invariant_load(ptr %in, i32 %s) {
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; CHECK-LABEL: @invariant_load(
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; CHECK-NEXT: main_body:
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; CHECK-NEXT: [[C:%.*]] = icmp eq i32 [[S:%.*]], 0
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; CHECK-NEXT: br i1 [[C]], label [[BLOCK:%.*]], label [[END:%.*]]
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; CHECK: block:
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; CHECK-NEXT: [[Z:%.*]] = add i32 [[S]], 1
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; CHECK-NEXT: br label [[END]]
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; CHECK: end:
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; CHECK-NEXT: [[V:%.*]] = load <4 x float>, ptr [[IN:%.*]], align 16, !invariant.load [[META0:![0-9]+]]
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; CHECK-NEXT: ret <4 x float> [[V]]
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;
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main_body:
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%v = load <4 x float>, ptr %in, !invariant.load !0
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%c = icmp eq i32 %s, 0
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br i1 %c, label %block, label %end
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block:
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%z = add i32 %s, 1
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br label %end
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end:
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ret <4 x float> %v
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}
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; Loads that aren't marked invariant but used in one branch
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; can be sunk to that branch.
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define void @invariant_load_use_in_br(ptr %p, i1 %cond) {
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; CHECK-LABEL: @invariant_load_use_in_br(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[TRUE_BR:%.*]], label [[FALSE_BR:%.*]]
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; CHECK: true.br:
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; CHECK-NEXT: call void @fn()
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; CHECK-NEXT: br label [[EXIT:%.*]]
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; CHECK: false.br:
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; CHECK-NEXT: [[VAL:%.*]] = load i32, ptr [[P:%.*]], align 4
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; CHECK-NEXT: call void @fn(i32 [[VAL]])
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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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%val = load i32, ptr %p
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br i1 %cond, label %true.br, label %false.br
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true.br:
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call void @fn()
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br label %exit
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false.br:
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call void @fn(i32 %val)
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br label %exit
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exit:
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ret void
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}
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; TODO: Invariant loads marked with metadata can be sunk past calls.
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define void @invariant_load_metadata_call(ptr %p, i1 %cond) {
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; CHECK-LABEL: @invariant_load_metadata_call(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[VAL:%.*]] = load i32, ptr [[P:%.*]], align 4, !invariant.load [[META0]]
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; CHECK-NEXT: call void @fn()
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[TRUE_BR:%.*]], label [[FALSE_BR:%.*]]
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; CHECK: true.br:
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; CHECK-NEXT: call void @fn()
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; CHECK-NEXT: br label [[EXIT:%.*]]
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; CHECK: false.br:
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; CHECK-NEXT: call void @fn(i32 [[VAL]])
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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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%val = load i32, ptr %p, !invariant.load !0
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call void @fn()
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br i1 %cond, label %true.br, label %false.br
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true.br:
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call void @fn()
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br label %exit
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false.br:
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call void @fn(i32 %val)
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br label %exit
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exit:
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ret void
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}
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declare void @fn()
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!0 = !{}
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