238 lines
9.5 KiB
LLVM
238 lines
9.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -early-cse -earlycse-debug-hash < %s | FileCheck %s --check-prefixes=CHECK,NO_ASSUME
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; RUN: opt -S -basic-aa -early-cse-memssa < %s | FileCheck %s --check-prefixes=CHECK,NO_ASSUME
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; RUN: opt -S -basic-aa -early-cse-memssa --enable-knowledge-retention < %s | FileCheck %s --check-prefixes=CHECK,USE_ASSUME
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declare void @clobber_and_use(i32)
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define void @f_0(i32* %ptr) {
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; NO_ASSUME-LABEL: @f_0(
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; NO_ASSUME-NEXT: [[VAL0:%.*]] = load i32, i32* [[PTR:%.*]], align 4, !invariant.load !0
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; NO_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; NO_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; NO_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; NO_ASSUME-NEXT: ret void
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;
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; USE_ASSUME-LABEL: @f_0(
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; USE_ASSUME-NEXT: [[VAL0:%.*]] = load i32, i32* [[PTR:%.*]], align 4, !invariant.load !0
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; USE_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(i32* [[PTR]], i64 4), "nonnull"(i32* [[PTR]]), "align"(i32* [[PTR]], i64 4) ]
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; USE_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; USE_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; USE_ASSUME-NEXT: ret void
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;
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%val0 = load i32, i32* %ptr, !invariant.load !{}
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call void @clobber_and_use(i32 %val0)
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%val1 = load i32, i32* %ptr, !invariant.load !{}
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call void @clobber_and_use(i32 %val1)
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%val2 = load i32, i32* %ptr, !invariant.load !{}
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call void @clobber_and_use(i32 %val2)
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ret void
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}
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define void @f_1(i32* %ptr) {
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; We can forward invariant loads to non-invariant loads.
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; NO_ASSUME-LABEL: @f_1(
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; NO_ASSUME-NEXT: [[VAL0:%.*]] = load i32, i32* [[PTR:%.*]], align 4, !invariant.load !0
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; NO_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; NO_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; NO_ASSUME-NEXT: ret void
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;
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; USE_ASSUME-LABEL: @f_1(
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; USE_ASSUME-NEXT: [[VAL0:%.*]] = load i32, i32* [[PTR:%.*]], align 4, !invariant.load !0
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; USE_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(i32* [[PTR]], i64 4), "nonnull"(i32* [[PTR]]), "align"(i32* [[PTR]], i64 4) ]
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; USE_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; USE_ASSUME-NEXT: ret void
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;
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%val0 = load i32, i32* %ptr, !invariant.load !{}
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call void @clobber_and_use(i32 %val0)
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%val1 = load i32, i32* %ptr
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call void @clobber_and_use(i32 %val1)
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ret void
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}
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define void @f_2(i32* %ptr) {
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; We can forward a non-invariant load into an invariant load.
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; NO_ASSUME-LABEL: @f_2(
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; NO_ASSUME-NEXT: [[VAL0:%.*]] = load i32, i32* [[PTR:%.*]], align 4
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; NO_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; NO_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; NO_ASSUME-NEXT: ret void
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;
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; USE_ASSUME-LABEL: @f_2(
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; USE_ASSUME-NEXT: [[VAL0:%.*]] = load i32, i32* [[PTR:%.*]], align 4
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; USE_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(i32* [[PTR]], i64 4), "nonnull"(i32* [[PTR]]), "align"(i32* [[PTR]], i64 4) ]
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; USE_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; USE_ASSUME-NEXT: ret void
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;
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%val0 = load i32, i32* %ptr
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call void @clobber_and_use(i32 %val0)
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%val1 = load i32, i32* %ptr, !invariant.load !{}
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call void @clobber_and_use(i32 %val1)
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ret void
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}
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define void @f_3(i1 %cond, i32* %ptr) {
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; NO_ASSUME-LABEL: @f_3(
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; NO_ASSUME-NEXT: [[VAL0:%.*]] = load i32, i32* [[PTR:%.*]], align 4, !invariant.load !0
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; NO_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; NO_ASSUME-NEXT: br i1 [[COND:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
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; NO_ASSUME: left:
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; NO_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; NO_ASSUME-NEXT: ret void
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; NO_ASSUME: right:
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; NO_ASSUME-NEXT: ret void
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;
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; USE_ASSUME-LABEL: @f_3(
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; USE_ASSUME-NEXT: [[VAL0:%.*]] = load i32, i32* [[PTR:%.*]], align 4, !invariant.load !0
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; USE_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; USE_ASSUME-NEXT: br i1 [[COND:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
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; USE_ASSUME: left:
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; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(i32* [[PTR]], i64 4), "nonnull"(i32* [[PTR]]), "align"(i32* [[PTR]], i64 4) ]
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; USE_ASSUME-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; USE_ASSUME-NEXT: ret void
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; USE_ASSUME: right:
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; USE_ASSUME-NEXT: ret void
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;
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%val0 = load i32, i32* %ptr, !invariant.load !{}
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call void @clobber_and_use(i32 %val0)
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br i1 %cond, label %left, label %right
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left:
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%val1 = load i32, i32* %ptr
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call void @clobber_and_use(i32 %val1)
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ret void
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right:
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ret void
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}
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define void @f_4(i1 %cond, i32* %ptr) {
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; Negative test -- can't forward %val0 to %va1 because that'll break
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; def-dominates-use.
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; CHECK-LABEL: @f_4(
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[LEFT:%.*]], label [[MERGE:%.*]]
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; CHECK: left:
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; CHECK-NEXT: [[VAL0:%.*]] = load i32, i32* [[PTR:%.*]], align 4, !invariant.load !0
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; CHECK-NEXT: call void @clobber_and_use(i32 [[VAL0]])
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; CHECK-NEXT: br label [[MERGE]]
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; CHECK: merge:
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; CHECK-NEXT: [[VAL1:%.*]] = load i32, i32* [[PTR]], align 4
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; CHECK-NEXT: call void @clobber_and_use(i32 [[VAL1]])
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; CHECK-NEXT: ret void
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;
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br i1 %cond, label %left, label %merge
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left:
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%val0 = load i32, i32* %ptr, !invariant.load !{}
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call void @clobber_and_use(i32 %val0)
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br label %merge
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merge:
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%val1 = load i32, i32* %ptr
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call void @clobber_and_use(i32 %val1)
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ret void
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}
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; By assumption, the call can't change contents of p
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; LangRef is a bit unclear about whether the store is reachable, so
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; for the moment we chose to be conservative and just assume it's valid
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; to restore the same unchanging value.
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define void @test_dse1(i32* %p) {
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; NO_ASSUME-LABEL: @test_dse1(
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; NO_ASSUME-NEXT: [[V1:%.*]] = load i32, i32* [[P:%.*]], align 4, !invariant.load !0
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; NO_ASSUME-NEXT: call void @clobber_and_use(i32 [[V1]])
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; NO_ASSUME-NEXT: ret void
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;
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; USE_ASSUME-LABEL: @test_dse1(
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; USE_ASSUME-NEXT: [[V1:%.*]] = load i32, i32* [[P:%.*]], align 4, !invariant.load !0
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; USE_ASSUME-NEXT: call void @clobber_and_use(i32 [[V1]])
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; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(i32* [[P]], i64 4), "nonnull"(i32* [[P]]), "align"(i32* [[P]], i64 4) ]
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; USE_ASSUME-NEXT: ret void
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;
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%v1 = load i32, i32* %p, !invariant.load !{}
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call void @clobber_and_use(i32 %v1)
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store i32 %v1, i32* %p
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ret void
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}
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; By assumption, v1 must equal v2 (TODO)
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define void @test_false_negative_dse2(i32* %p, i32 %v2) {
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; CHECK-LABEL: @test_false_negative_dse2(
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; CHECK-NEXT: [[V1:%.*]] = load i32, i32* [[P:%.*]], align 4, !invariant.load !0
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; CHECK-NEXT: call void @clobber_and_use(i32 [[V1]])
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; CHECK-NEXT: store i32 [[V2:%.*]], i32* [[P]], align 4
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; CHECK-NEXT: ret void
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;
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%v1 = load i32, i32* %p, !invariant.load !{}
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call void @clobber_and_use(i32 %v1)
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store i32 %v2, i32* %p
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ret void
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}
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; If we remove the load, we still start an invariant scope since
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; it lets us remove later loads not explicitly marked invariant
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define void @test_scope_start_without_load(i32* %p) {
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; NO_ASSUME-LABEL: @test_scope_start_without_load(
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; NO_ASSUME-NEXT: [[V1:%.*]] = load i32, i32* [[P:%.*]], align 4
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; NO_ASSUME-NEXT: [[ADD:%.*]] = add i32 [[V1]], [[V1]]
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; NO_ASSUME-NEXT: call void @clobber_and_use(i32 [[ADD]])
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; NO_ASSUME-NEXT: call void @clobber_and_use(i32 [[V1]])
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; NO_ASSUME-NEXT: ret void
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;
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; USE_ASSUME-LABEL: @test_scope_start_without_load(
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; USE_ASSUME-NEXT: [[V1:%.*]] = load i32, i32* [[P:%.*]], align 4
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; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(i32* [[P]], i64 4), "nonnull"(i32* [[P]]), "align"(i32* [[P]], i64 4) ]
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; USE_ASSUME-NEXT: [[ADD:%.*]] = add i32 [[V1]], [[V1]]
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; USE_ASSUME-NEXT: call void @clobber_and_use(i32 [[ADD]])
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; USE_ASSUME-NEXT: call void @clobber_and_use(i32 [[V1]])
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; USE_ASSUME-NEXT: ret void
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;
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%v1 = load i32, i32* %p
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%v2 = load i32, i32* %p, !invariant.load !{}
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%add = add i32 %v1, %v2
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call void @clobber_and_use(i32 %add)
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%v3 = load i32, i32* %p
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call void @clobber_and_use(i32 %v3)
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ret void
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}
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; If we already have an invariant scope, don't want to start a new one
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; with a potentially greater generation. This hides the earlier invariant
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; load
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define void @test_scope_restart(i32* %p) {
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; NO_ASSUME-LABEL: @test_scope_restart(
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; NO_ASSUME-NEXT: [[V1:%.*]] = load i32, i32* [[P:%.*]], align 4, !invariant.load !0
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; NO_ASSUME-NEXT: call void @clobber_and_use(i32 [[V1]])
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; NO_ASSUME-NEXT: [[ADD:%.*]] = add i32 [[V1]], [[V1]]
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; NO_ASSUME-NEXT: call void @clobber_and_use(i32 [[ADD]])
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; NO_ASSUME-NEXT: call void @clobber_and_use(i32 [[V1]])
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; NO_ASSUME-NEXT: ret void
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;
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; USE_ASSUME-LABEL: @test_scope_restart(
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; USE_ASSUME-NEXT: [[V1:%.*]] = load i32, i32* [[P:%.*]], align 4, !invariant.load !0
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; USE_ASSUME-NEXT: call void @clobber_and_use(i32 [[V1]])
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; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(i32* [[P]], i64 4), "nonnull"(i32* [[P]]), "align"(i32* [[P]], i64 4) ]
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; USE_ASSUME-NEXT: [[ADD:%.*]] = add i32 [[V1]], [[V1]]
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; USE_ASSUME-NEXT: call void @clobber_and_use(i32 [[ADD]])
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; USE_ASSUME-NEXT: call void @clobber_and_use(i32 [[V1]])
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; USE_ASSUME-NEXT: ret void
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;
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%v1 = load i32, i32* %p, !invariant.load !{}
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call void @clobber_and_use(i32 %v1)
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%v2 = load i32, i32* %p, !invariant.load !{}
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%add = add i32 %v1, %v2
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call void @clobber_and_use(i32 %add)
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%v3 = load i32, i32* %p
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call void @clobber_and_use(i32 %v3)
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ret void
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}
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