| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature |
| ; RUN: opt < %s -S -passes=early-cse -earlycse-debug-hash | FileCheck %s --check-prefixes=CHECK,NO_ASSUME |
| ; RUN: opt < %s -S -passes=early-cse --enable-knowledge-retention | FileCheck %s --check-prefixes=CHECK,USE_ASSUME |
| ; RUN: opt < %s -S -passes=early-cse | FileCheck %s --check-prefixes=CHECK,NO_ASSUME |
| |
| declare ptr @llvm.invariant.start.p0(i64, ptr nocapture) nounwind readonly |
| declare void @llvm.invariant.end.p0(ptr, i64, ptr nocapture) nounwind |
| |
| ; Check that we do load-load forwarding over invariant.start, since it does not |
| ; clobber memory |
| define i8 @test_bypass1(ptr%P) { |
| ; NO_ASSUME-LABEL: define {{[^@]+}}@test_bypass1 |
| ; NO_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; NO_ASSUME-NEXT: [[V1:%.*]] = load i8, ptr [[P]], align 1 |
| ; NO_ASSUME-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[P]]) |
| ; NO_ASSUME-NEXT: ret i8 0 |
| ; |
| ; USE_ASSUME-LABEL: define {{[^@]+}}@test_bypass1 |
| ; USE_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; USE_ASSUME-NEXT: [[V1:%.*]] = load i8, ptr [[P]], align 1 |
| ; USE_ASSUME-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[P]]) |
| ; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 1), "nonnull"(ptr [[P]]) ] |
| ; USE_ASSUME-NEXT: ret i8 0 |
| ; |
| |
| %V1 = load i8, ptr %P |
| %i = call ptr @llvm.invariant.start.p0(i64 1, ptr %P) |
| %V2 = load i8, ptr %P |
| %Diff = sub i8 %V1, %V2 |
| ret i8 %Diff |
| } |
| |
| |
| ; Trivial Store->load forwarding over invariant.start |
| define i8 @test_bypass2(ptr%P) { |
| ; NO_ASSUME-LABEL: define {{[^@]+}}@test_bypass2 |
| ; NO_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; NO_ASSUME-NEXT: store i8 42, ptr [[P]], align 1 |
| ; NO_ASSUME-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[P]]) |
| ; NO_ASSUME-NEXT: ret i8 42 |
| ; |
| ; USE_ASSUME-LABEL: define {{[^@]+}}@test_bypass2 |
| ; USE_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; USE_ASSUME-NEXT: store i8 42, ptr [[P]], align 1 |
| ; USE_ASSUME-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[P]]) |
| ; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 1), "nonnull"(ptr [[P]]) ] |
| ; USE_ASSUME-NEXT: ret i8 42 |
| ; |
| |
| store i8 42, ptr %P |
| %i = call ptr @llvm.invariant.start.p0(i64 1, ptr %P) |
| %V1 = load i8, ptr %P |
| ret i8 %V1 |
| } |
| |
| define i8 @test_bypass_store_load(ptr%P, ptr%P2) { |
| ; NO_ASSUME-LABEL: define {{[^@]+}}@test_bypass_store_load |
| ; NO_ASSUME-SAME: (ptr [[P:%.*]], ptr [[P2:%.*]]) { |
| ; NO_ASSUME-NEXT: store i8 42, ptr [[P]], align 1 |
| ; NO_ASSUME-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[P]]) |
| ; NO_ASSUME-NEXT: store i8 0, ptr [[P2]], align 1 |
| ; NO_ASSUME-NEXT: ret i8 42 |
| ; |
| ; USE_ASSUME-LABEL: define {{[^@]+}}@test_bypass_store_load |
| ; USE_ASSUME-SAME: (ptr [[P:%.*]], ptr [[P2:%.*]]) { |
| ; USE_ASSUME-NEXT: store i8 42, ptr [[P]], align 1 |
| ; USE_ASSUME-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[P]]) |
| ; USE_ASSUME-NEXT: store i8 0, ptr [[P2]], align 1 |
| ; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 1), "nonnull"(ptr [[P]]) ] |
| ; USE_ASSUME-NEXT: ret i8 42 |
| ; |
| |
| store i8 42, ptr %P |
| %i = call ptr @llvm.invariant.start.p0(i64 1, ptr %P) |
| store i8 0, ptr %P2 |
| %V1 = load i8, ptr %P |
| ret i8 %V1 |
| } |
| |
| define i8 @test_bypass_store_load_aatags_1(ptr%P, ptr%P2) { |
| ; NO_ASSUME-LABEL: define {{[^@]+}}@test_bypass_store_load_aatags_1 |
| ; NO_ASSUME-SAME: (ptr [[P:%.*]], ptr [[P2:%.*]]) { |
| ; NO_ASSUME-NEXT: store i8 42, ptr [[P]], align 1, !tbaa [[TBAA0:![0-9]+]] |
| ; NO_ASSUME-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[P]]) |
| ; NO_ASSUME-NEXT: store i8 0, ptr [[P2]], align 1 |
| ; NO_ASSUME-NEXT: ret i8 42 |
| ; |
| ; USE_ASSUME-LABEL: define {{[^@]+}}@test_bypass_store_load_aatags_1 |
| ; USE_ASSUME-SAME: (ptr [[P:%.*]], ptr [[P2:%.*]]) { |
| ; USE_ASSUME-NEXT: store i8 42, ptr [[P]], align 1, !tbaa [[TBAA0:![0-9]+]] |
| ; USE_ASSUME-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[P]]) |
| ; USE_ASSUME-NEXT: store i8 0, ptr [[P2]], align 1 |
| ; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 1), "nonnull"(ptr [[P]]) ] |
| ; USE_ASSUME-NEXT: ret i8 42 |
| ; |
| |
| store i8 42, ptr %P, !tbaa !0 |
| %i = call ptr @llvm.invariant.start.p0(i64 1, ptr %P) |
| store i8 0, ptr %P2 |
| %V1 = load i8, ptr %P |
| ret i8 %V1 |
| } |
| |
| ; The test demonstrates a missed optimization opportunity in case when the load |
| ; has AA tags that are different from the store tags. |
| define i8 @test_bypass_store_load_aatags_2(ptr%P, ptr%P2) { |
| ; CHECK-LABEL: define {{[^@]+}}@test_bypass_store_load_aatags_2 |
| ; CHECK-SAME: (ptr [[P:%.*]], ptr [[P2:%.*]]) { |
| ; CHECK-NEXT: store i8 42, ptr [[P]], align 1 |
| ; CHECK-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[P]]) |
| ; CHECK-NEXT: store i8 0, ptr [[P2]], align 1 |
| ; CHECK-NEXT: [[V1:%.*]] = load i8, ptr [[P]], align 1, !tbaa [[TBAA0:![0-9]+]] |
| ; CHECK-NEXT: ret i8 [[V1]] |
| ; |
| |
| store i8 42, ptr %P |
| %i = call ptr @llvm.invariant.start.p0(i64 1, ptr %P) |
| store i8 0, ptr %P2 |
| %V1 = load i8, ptr %P, !tbaa !0 |
| ret i8 %V1 |
| } |
| |
| ; We can DSE over invariant.start calls, since the first store to |
| ; %P is valid, and the second store is actually unreachable based on semantics |
| ; of invariant.start. |
| define void @test_bypass3(ptr %P) { |
| ; NO_ASSUME-LABEL: define {{[^@]+}}@test_bypass3 |
| ; NO_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; NO_ASSUME-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[P]]) |
| ; NO_ASSUME-NEXT: store i8 60, ptr [[P]], align 1 |
| ; NO_ASSUME-NEXT: ret void |
| ; |
| ; USE_ASSUME-LABEL: define {{[^@]+}}@test_bypass3 |
| ; USE_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; USE_ASSUME-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[P]]) |
| ; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 1), "nonnull"(ptr [[P]]) ] |
| ; USE_ASSUME-NEXT: store i8 60, ptr [[P]], align 1 |
| ; USE_ASSUME-NEXT: ret void |
| ; |
| |
| store i8 50, ptr %P |
| %i = call ptr @llvm.invariant.start.p0(i64 1, ptr %P) |
| store i8 60, ptr %P |
| ret void |
| } |
| |
| |
| ; FIXME: Now the first store can actually be eliminated, since there is no read within |
| ; the invariant region, between start and end. |
| define void @test_bypass4(ptr %P) { |
| ; CHECK-LABEL: define {{[^@]+}}@test_bypass4 |
| ; CHECK-SAME: (ptr [[P:%.*]]) { |
| ; CHECK-NEXT: store i8 50, ptr [[P]], align 1 |
| ; CHECK-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[P]]) |
| ; CHECK-NEXT: call void @llvm.invariant.end.p0(ptr [[I]], i64 1, ptr [[P]]) |
| ; CHECK-NEXT: store i8 60, ptr [[P]], align 1 |
| ; CHECK-NEXT: ret void |
| ; |
| |
| |
| store i8 50, ptr %P |
| %i = call ptr @llvm.invariant.start.p0(i64 1, ptr %P) |
| call void @llvm.invariant.end.p0(ptr %i, i64 1, ptr %P) |
| store i8 60, ptr %P |
| ret void |
| } |
| |
| |
| declare void @clobber() |
| |
| define i32 @test_before_load(ptr %p) { |
| ; NO_ASSUME-LABEL: define {{[^@]+}}@test_before_load |
| ; NO_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; NO_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; NO_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; NO_ASSUME-NEXT: call void @clobber() |
| ; NO_ASSUME-NEXT: ret i32 0 |
| ; |
| ; USE_ASSUME-LABEL: define {{[^@]+}}@test_before_load |
| ; USE_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; USE_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; USE_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; USE_ASSUME-NEXT: call void @clobber() |
| ; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 4), "nonnull"(ptr [[P]]), "align"(ptr [[P]], i64 4) ] |
| ; USE_ASSUME-NEXT: ret i32 0 |
| ; |
| call ptr @llvm.invariant.start.p0(i64 4, ptr %p) |
| %v1 = load i32, ptr %p |
| call void @clobber() |
| %v2 = load i32, ptr %p |
| %sub = sub i32 %v1, %v2 |
| ret i32 %sub |
| } |
| |
| define i32 @test_before_clobber(ptr %p) { |
| ; NO_ASSUME-LABEL: define {{[^@]+}}@test_before_clobber |
| ; NO_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; NO_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; NO_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; NO_ASSUME-NEXT: call void @clobber() |
| ; NO_ASSUME-NEXT: ret i32 0 |
| ; |
| ; USE_ASSUME-LABEL: define {{[^@]+}}@test_before_clobber |
| ; USE_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; USE_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; USE_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; USE_ASSUME-NEXT: call void @clobber() |
| ; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 4), "nonnull"(ptr [[P]]), "align"(ptr [[P]], i64 4) ] |
| ; USE_ASSUME-NEXT: ret i32 0 |
| ; |
| %v1 = load i32, ptr %p |
| call ptr @llvm.invariant.start.p0(i64 4, ptr %p) |
| call void @clobber() |
| %v2 = load i32, ptr %p |
| %sub = sub i32 %v1, %v2 |
| ret i32 %sub |
| } |
| |
| define i32 @test_duplicate_scope(ptr %p) { |
| ; NO_ASSUME-LABEL: define {{[^@]+}}@test_duplicate_scope |
| ; NO_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; NO_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; NO_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; NO_ASSUME-NEXT: call void @clobber() |
| ; NO_ASSUME-NEXT: [[TMP2:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; NO_ASSUME-NEXT: ret i32 0 |
| ; |
| ; USE_ASSUME-LABEL: define {{[^@]+}}@test_duplicate_scope |
| ; USE_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; USE_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; USE_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; USE_ASSUME-NEXT: call void @clobber() |
| ; USE_ASSUME-NEXT: [[TMP2:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 4), "nonnull"(ptr [[P]]), "align"(ptr [[P]], i64 4) ] |
| ; USE_ASSUME-NEXT: ret i32 0 |
| ; |
| %v1 = load i32, ptr %p |
| call ptr @llvm.invariant.start.p0(i64 4, ptr %p) |
| call void @clobber() |
| call ptr @llvm.invariant.start.p0(i64 4, ptr %p) |
| %v2 = load i32, ptr %p |
| %sub = sub i32 %v1, %v2 |
| ret i32 %sub |
| } |
| |
| define i32 @test_unanalzyable_load(ptr %p) { |
| ; NO_ASSUME-LABEL: define {{[^@]+}}@test_unanalzyable_load |
| ; NO_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; NO_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; NO_ASSUME-NEXT: call void @clobber() |
| ; NO_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; NO_ASSUME-NEXT: call void @clobber() |
| ; NO_ASSUME-NEXT: ret i32 0 |
| ; |
| ; USE_ASSUME-LABEL: define {{[^@]+}}@test_unanalzyable_load |
| ; USE_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; USE_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; USE_ASSUME-NEXT: call void @clobber() |
| ; USE_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; USE_ASSUME-NEXT: call void @clobber() |
| ; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 4), "nonnull"(ptr [[P]]), "align"(ptr [[P]], i64 4) ] |
| ; USE_ASSUME-NEXT: ret i32 0 |
| ; |
| call ptr @llvm.invariant.start.p0(i64 4, ptr %p) |
| call void @clobber() |
| %v1 = load i32, ptr %p |
| call void @clobber() |
| %v2 = load i32, ptr %p |
| %sub = sub i32 %v1, %v2 |
| ret i32 %sub |
| } |
| |
| define i32 @test_negative_after_clobber(ptr %p) { |
| ; CHECK-LABEL: define {{[^@]+}}@test_negative_after_clobber |
| ; CHECK-SAME: (ptr [[P:%.*]]) { |
| ; CHECK-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: call void @clobber() |
| ; CHECK-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; CHECK-NEXT: [[V2:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[V1]], [[V2]] |
| ; CHECK-NEXT: ret i32 [[SUB]] |
| ; |
| %v1 = load i32, ptr %p |
| call void @clobber() |
| call ptr @llvm.invariant.start.p0(i64 4, ptr %p) |
| %v2 = load i32, ptr %p |
| %sub = sub i32 %v1, %v2 |
| ret i32 %sub |
| } |
| |
| define i32 @test_merge(ptr %p, i1 %cnd) { |
| ; NO_ASSUME-LABEL: define {{[^@]+}}@test_merge |
| ; NO_ASSUME-SAME: (ptr [[P:%.*]], i1 [[CND:%.*]]) { |
| ; NO_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; NO_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; NO_ASSUME-NEXT: br i1 [[CND]], label [[MERGE:%.*]], label [[TAKEN:%.*]] |
| ; NO_ASSUME: taken: |
| ; NO_ASSUME-NEXT: call void @clobber() |
| ; NO_ASSUME-NEXT: br label [[MERGE]] |
| ; NO_ASSUME: merge: |
| ; NO_ASSUME-NEXT: ret i32 0 |
| ; |
| ; USE_ASSUME-LABEL: define {{[^@]+}}@test_merge |
| ; USE_ASSUME-SAME: (ptr [[P:%.*]], i1 [[CND:%.*]]) { |
| ; USE_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; USE_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; USE_ASSUME-NEXT: br i1 [[CND]], label [[MERGE:%.*]], label [[TAKEN:%.*]] |
| ; USE_ASSUME: taken: |
| ; USE_ASSUME-NEXT: call void @clobber() |
| ; USE_ASSUME-NEXT: br label [[MERGE]] |
| ; USE_ASSUME: merge: |
| ; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 4), "nonnull"(ptr [[P]]), "align"(ptr [[P]], i64 4) ] |
| ; USE_ASSUME-NEXT: ret i32 0 |
| ; |
| %v1 = load i32, ptr %p |
| call ptr @llvm.invariant.start.p0(i64 4, ptr %p) |
| br i1 %cnd, label %merge, label %taken |
| |
| taken: |
| call void @clobber() |
| br label %merge |
| merge: |
| %v2 = load i32, ptr %p |
| %sub = sub i32 %v1, %v2 |
| ret i32 %sub |
| } |
| |
| define i32 @test_negative_after_mergeclobber(ptr %p, i1 %cnd) { |
| ; CHECK-LABEL: define {{[^@]+}}@test_negative_after_mergeclobber |
| ; CHECK-SAME: (ptr [[P:%.*]], i1 [[CND:%.*]]) { |
| ; CHECK-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: br i1 [[CND]], label [[MERGE:%.*]], label [[TAKEN:%.*]] |
| ; CHECK: taken: |
| ; CHECK-NEXT: call void @clobber() |
| ; CHECK-NEXT: br label [[MERGE]] |
| ; CHECK: merge: |
| ; CHECK-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; CHECK-NEXT: [[V2:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[V1]], [[V2]] |
| ; CHECK-NEXT: ret i32 [[SUB]] |
| ; |
| %v1 = load i32, ptr %p |
| br i1 %cnd, label %merge, label %taken |
| |
| taken: |
| call void @clobber() |
| br label %merge |
| merge: |
| call ptr @llvm.invariant.start.p0(i64 4, ptr %p) |
| %v2 = load i32, ptr %p |
| %sub = sub i32 %v1, %v2 |
| ret i32 %sub |
| } |
| |
| ; In theory, this version could work, but earlycse is incapable of |
| ; merging facts along distinct paths. |
| define i32 @test_false_negative_merge(ptr %p, i1 %cnd) { |
| ; CHECK-LABEL: define {{[^@]+}}@test_false_negative_merge |
| ; CHECK-SAME: (ptr [[P:%.*]], i1 [[CND:%.*]]) { |
| ; CHECK-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: br i1 [[CND]], label [[MERGE:%.*]], label [[TAKEN:%.*]] |
| ; CHECK: taken: |
| ; CHECK-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; CHECK-NEXT: call void @clobber() |
| ; CHECK-NEXT: br label [[MERGE]] |
| ; CHECK: merge: |
| ; CHECK-NEXT: [[V2:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[V1]], [[V2]] |
| ; CHECK-NEXT: ret i32 [[SUB]] |
| ; |
| %v1 = load i32, ptr %p |
| br i1 %cnd, label %merge, label %taken |
| |
| taken: |
| call ptr @llvm.invariant.start.p0(i64 4, ptr %p) |
| call void @clobber() |
| br label %merge |
| merge: |
| %v2 = load i32, ptr %p |
| %sub = sub i32 %v1, %v2 |
| ret i32 %sub |
| } |
| |
| define i32 @test_merge_unanalyzable_load(ptr %p, i1 %cnd) { |
| ; NO_ASSUME-LABEL: define {{[^@]+}}@test_merge_unanalyzable_load |
| ; NO_ASSUME-SAME: (ptr [[P:%.*]], i1 [[CND:%.*]]) { |
| ; NO_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; NO_ASSUME-NEXT: call void @clobber() |
| ; NO_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; NO_ASSUME-NEXT: br i1 [[CND]], label [[MERGE:%.*]], label [[TAKEN:%.*]] |
| ; NO_ASSUME: taken: |
| ; NO_ASSUME-NEXT: call void @clobber() |
| ; NO_ASSUME-NEXT: br label [[MERGE]] |
| ; NO_ASSUME: merge: |
| ; NO_ASSUME-NEXT: ret i32 0 |
| ; |
| ; USE_ASSUME-LABEL: define {{[^@]+}}@test_merge_unanalyzable_load |
| ; USE_ASSUME-SAME: (ptr [[P:%.*]], i1 [[CND:%.*]]) { |
| ; USE_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; USE_ASSUME-NEXT: call void @clobber() |
| ; USE_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; USE_ASSUME-NEXT: br i1 [[CND]], label [[MERGE:%.*]], label [[TAKEN:%.*]] |
| ; USE_ASSUME: taken: |
| ; USE_ASSUME-NEXT: call void @clobber() |
| ; USE_ASSUME-NEXT: br label [[MERGE]] |
| ; USE_ASSUME: merge: |
| ; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 4), "nonnull"(ptr [[P]]), "align"(ptr [[P]], i64 4) ] |
| ; USE_ASSUME-NEXT: ret i32 0 |
| ; |
| call ptr @llvm.invariant.start.p0(i64 4, ptr %p) |
| call void @clobber() |
| %v1 = load i32, ptr %p |
| br i1 %cnd, label %merge, label %taken |
| |
| taken: |
| call void @clobber() |
| br label %merge |
| merge: |
| %v2 = load i32, ptr %p |
| %sub = sub i32 %v1, %v2 |
| ret i32 %sub |
| } |
| |
| define void @test_dse_before_load(ptr %p, i1 %cnd) { |
| ; NO_ASSUME-LABEL: define {{[^@]+}}@test_dse_before_load |
| ; NO_ASSUME-SAME: (ptr [[P:%.*]], i1 [[CND:%.*]]) { |
| ; NO_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; NO_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; NO_ASSUME-NEXT: call void @clobber() |
| ; NO_ASSUME-NEXT: ret void |
| ; |
| ; USE_ASSUME-LABEL: define {{[^@]+}}@test_dse_before_load |
| ; USE_ASSUME-SAME: (ptr [[P:%.*]], i1 [[CND:%.*]]) { |
| ; USE_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; USE_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; USE_ASSUME-NEXT: call void @clobber() |
| ; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 4), "nonnull"(ptr [[P]]), "align"(ptr [[P]], i64 4) ] |
| ; USE_ASSUME-NEXT: ret void |
| ; |
| call ptr @llvm.invariant.start.p0(i64 4, ptr %p) |
| %v1 = load i32, ptr %p |
| call void @clobber() |
| store i32 %v1, ptr %p |
| ret void |
| } |
| |
| define void @test_dse_after_load(ptr %p, i1 %cnd) { |
| ; NO_ASSUME-LABEL: define {{[^@]+}}@test_dse_after_load |
| ; NO_ASSUME-SAME: (ptr [[P:%.*]], i1 [[CND:%.*]]) { |
| ; NO_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; NO_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; NO_ASSUME-NEXT: call void @clobber() |
| ; NO_ASSUME-NEXT: ret void |
| ; |
| ; USE_ASSUME-LABEL: define {{[^@]+}}@test_dse_after_load |
| ; USE_ASSUME-SAME: (ptr [[P:%.*]], i1 [[CND:%.*]]) { |
| ; USE_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; USE_ASSUME-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; USE_ASSUME-NEXT: call void @clobber() |
| ; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 4), "nonnull"(ptr [[P]]), "align"(ptr [[P]], i64 4) ] |
| ; USE_ASSUME-NEXT: ret void |
| ; |
| %v1 = load i32, ptr %p |
| call ptr @llvm.invariant.start.p0(i64 4, ptr %p) |
| call void @clobber() |
| store i32 %v1, ptr %p |
| ret void |
| } |
| |
| |
| ; In this case, we have a false negative since MemoryLocation is implicitly |
| ; typed due to the user of a Value to represent the address. Note that other |
| ; passes will canonicalize away the bitcasts in this example. |
| define i32 @test_false_negative_types(ptr %p) { |
| ; CHECK-LABEL: define {{[^@]+}}@test_false_negative_types |
| ; CHECK-SAME: (ptr [[P:%.*]]) { |
| ; CHECK-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; CHECK-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: call void @clobber() |
| ; CHECK-NEXT: [[V2F:%.*]] = load float, ptr [[P]], align 4 |
| ; CHECK-NEXT: [[V2:%.*]] = bitcast float [[V2F]] to i32 |
| ; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[V1]], [[V2]] |
| ; CHECK-NEXT: ret i32 [[SUB]] |
| ; |
| call ptr @llvm.invariant.start.p0(i64 4, ptr %p) |
| %v1 = load i32, ptr %p |
| call void @clobber() |
| %v2f = load float, ptr %p |
| %v2 = bitcast float %v2f to i32 |
| %sub = sub i32 %v1, %v2 |
| ret i32 %sub |
| } |
| |
| define i32 @test_negative_size1(ptr %p) { |
| ; CHECK-LABEL: define {{[^@]+}}@test_negative_size1 |
| ; CHECK-SAME: (ptr [[P:%.*]]) { |
| ; CHECK-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 3, ptr [[P]]) |
| ; CHECK-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: call void @clobber() |
| ; CHECK-NEXT: [[V2:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[V1]], [[V2]] |
| ; CHECK-NEXT: ret i32 [[SUB]] |
| ; |
| call ptr @llvm.invariant.start.p0(i64 3, ptr %p) |
| %v1 = load i32, ptr %p |
| call void @clobber() |
| %v2 = load i32, ptr %p |
| %sub = sub i32 %v1, %v2 |
| ret i32 %sub |
| } |
| |
| define i32 @test_negative_size2(ptr %p) { |
| ; CHECK-LABEL: define {{[^@]+}}@test_negative_size2 |
| ; CHECK-SAME: (ptr [[P:%.*]]) { |
| ; CHECK-NEXT: [[TMP1:%.*]] = call ptr @llvm.invariant.start.p0(i64 0, ptr [[P]]) |
| ; CHECK-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: call void @clobber() |
| ; CHECK-NEXT: [[V2:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[V1]], [[V2]] |
| ; CHECK-NEXT: ret i32 [[SUB]] |
| ; |
| call ptr @llvm.invariant.start.p0(i64 0, ptr %p) |
| %v1 = load i32, ptr %p |
| call void @clobber() |
| %v2 = load i32, ptr %p |
| %sub = sub i32 %v1, %v2 |
| ret i32 %sub |
| } |
| |
| define i32 @test_negative_scope(ptr %p) { |
| ; CHECK-LABEL: define {{[^@]+}}@test_negative_scope |
| ; CHECK-SAME: (ptr [[P:%.*]]) { |
| ; CHECK-NEXT: [[SCOPE:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; CHECK-NEXT: call void @llvm.invariant.end.p0(ptr [[SCOPE]], i64 4, ptr [[P]]) |
| ; CHECK-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: call void @clobber() |
| ; CHECK-NEXT: [[V2:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[V1]], [[V2]] |
| ; CHECK-NEXT: ret i32 [[SUB]] |
| ; |
| %scope = call ptr @llvm.invariant.start.p0(i64 4, ptr %p) |
| call void @llvm.invariant.end.p0(ptr %scope, i64 4, ptr %p) |
| %v1 = load i32, ptr %p |
| call void @clobber() |
| %v2 = load i32, ptr %p |
| %sub = sub i32 %v1, %v2 |
| ret i32 %sub |
| } |
| |
| define i32 @test_false_negative_scope(ptr %p) { |
| ; CHECK-LABEL: define {{[^@]+}}@test_false_negative_scope |
| ; CHECK-SAME: (ptr [[P:%.*]]) { |
| ; CHECK-NEXT: [[SCOPE:%.*]] = call ptr @llvm.invariant.start.p0(i64 4, ptr [[P]]) |
| ; CHECK-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: call void @clobber() |
| ; CHECK-NEXT: [[V2:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: call void @llvm.invariant.end.p0(ptr [[SCOPE]], i64 4, ptr [[P]]) |
| ; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[V1]], [[V2]] |
| ; CHECK-NEXT: ret i32 [[SUB]] |
| ; |
| %scope = call ptr @llvm.invariant.start.p0(i64 4, ptr %p) |
| %v1 = load i32, ptr %p |
| call void @clobber() |
| %v2 = load i32, ptr %p |
| call void @llvm.invariant.end.p0(ptr %scope, i64 4, ptr %p) |
| %sub = sub i32 %v1, %v2 |
| ret i32 %sub |
| } |
| |
| ; Invariant load defact starts an invariant.start scope of the appropriate size |
| define i32 @test_invariant_load_scope(ptr %p) { |
| ; NO_ASSUME-LABEL: define {{[^@]+}}@test_invariant_load_scope |
| ; NO_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; NO_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4, !invariant.load !4 |
| ; NO_ASSUME-NEXT: call void @clobber() |
| ; NO_ASSUME-NEXT: ret i32 0 |
| ; |
| ; USE_ASSUME-LABEL: define {{[^@]+}}@test_invariant_load_scope |
| ; USE_ASSUME-SAME: (ptr [[P:%.*]]) { |
| ; USE_ASSUME-NEXT: [[V1:%.*]] = load i32, ptr [[P]], align 4, !invariant.load !4 |
| ; USE_ASSUME-NEXT: call void @clobber() |
| ; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 4), "nonnull"(ptr [[P]]), "align"(ptr [[P]], i64 4) ] |
| ; USE_ASSUME-NEXT: ret i32 0 |
| ; |
| %v1 = load i32, ptr %p, !invariant.load !{} |
| call void @clobber() |
| %v2 = load i32, ptr %p |
| %sub = sub i32 %v1, %v2 |
| ret i32 %sub |
| } |
| |
| ; USE_ASSUME: declare void @llvm.assume(i1 noundef) |
| |
| !0 = !{!1, !1, i64 0} |
| !1 = !{!"float", !2, i64 0} |
| !2 = !{!"omnipotent char", !3, i64 0} |
| !3 = !{!"Simple C/C++ TBAA"} |
