forked from OSchip/llvm-project
[DSE,MSSA] Add multi-path tests with readnone throwing calls.
This commit is contained in:
Florian Hahn
parent
bb7bde5bba
commit
e018b8bbb0
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -basicaa -dse -enable-dse-memoryssa -S | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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declare void @readnone_may_throw() readnone
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declare void @use(i32 *)
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; Tests where the pointer/object is accessible after the function returns.
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; Cannot remove the store from the entry block, because the call in bb2 may throw.
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define void @accessible_after_return_1(i32* noalias %P, i1 %c1) {
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; CHECK-LABEL: @accessible_after_return_1(
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; CHECK-NEXT: store i32 1, i32* [[P:%.*]]
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; CHECK-NEXT: br i1 [[C1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: store i32 0, i32* [[P]]
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; CHECK-NEXT: br label [[BB5:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: call void @readnone_may_throw()
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; CHECK-NEXT: store i32 3, i32* [[P]]
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; CHECK-NEXT: br label [[BB5]]
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; CHECK: bb5:
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; CHECK-NEXT: call void @use(i32* [[P]])
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; CHECK-NEXT: ret void
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;
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store i32 1, i32* %P
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br i1 %c1, label %bb1, label %bb2
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bb1:
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store i32 0, i32* %P
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br label %bb5
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bb2:
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call void @readnone_may_throw()
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store i32 3, i32* %P
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br label %bb5
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bb5:
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call void @use(i32* %P)
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ret void
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}
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; Cannot remove the store from the entry block, because the call in bb3 may throw.
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define void @accessible_after_return6(i32* %P, i1 %c.1, i1 %c.2) {
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; CHECK-LABEL: @accessible_after_return6(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i32 0, i32* [[P:%.*]]
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; CHECK-NEXT: br i1 [[C_1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: br i1 [[C_2:%.*]], label [[BB3:%.*]], label [[BB4:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: store i32 1, i32* [[P]]
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; CHECK-NEXT: ret void
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; CHECK: bb3:
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; CHECK-NEXT: call void @readnone_may_throw()
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; CHECK-NEXT: store i32 2, i32* [[P]]
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; CHECK-NEXT: ret void
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; CHECK: bb4:
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; CHECK-NEXT: store i32 3, i32* [[P]]
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; CHECK-NEXT: ret void
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;
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entry:
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store i32 0, i32* %P
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br i1 %c.1, label %bb1, label %bb2
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bb1:
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br i1 %c.2, label %bb3, label %bb4
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bb2:
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store i32 1, i32* %P
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ret void
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bb3:
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call void @readnone_may_throw()
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store i32 2, i32* %P
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ret void
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bb4:
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store i32 3, i32* %P
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ret void
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}
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; Tests where the pointer/object is *NOT* accessible after the function returns.
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; The store in the entry block can be eliminated, because it is overwritten
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; on all paths to the exit. As the location is not visible to the caller, the
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; call in bb2 (which may throw) can be ignored.
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define void @alloca_1(i1 %c1) {
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; CHECK-LABEL: @alloca_1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[P:%.*]] = alloca i32
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; CHECK-NEXT: br i1 [[C1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: store i32 0, i32* [[P]]
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; CHECK-NEXT: br label [[BB5:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: call void @readnone_may_throw()
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; CHECK-NEXT: store i32 3, i32* [[P]]
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; CHECK-NEXT: br label [[BB5]]
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; CHECK: bb5:
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; CHECK-NEXT: call void @use(i32* [[P]])
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; CHECK-NEXT: ret void
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;
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entry:
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%P = alloca i32
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store i32 1, i32* %P
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br i1 %c1, label %bb1, label %bb2
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bb1:
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store i32 0, i32* %P
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br label %bb5
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bb2:
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call void @readnone_may_throw()
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store i32 3, i32* %P
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br label %bb5
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bb5:
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call void @use(i32* %P)
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ret void
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}
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; The store in the entry block can be eliminated, because it is overwritten
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; on all paths to the exit. As the location is not visible to the caller, the
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; call in bb3 (which may throw) can be ignored.
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define void @alloca_2(i1 %c.1, i1 %c.2) {
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; CHECK-LABEL: @alloca_2(
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; CHECK-NEXT: [[P:%.*]] = alloca i32
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; CHECK-NEXT: br i1 [[C_1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: store i32 0, i32* [[P]]
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; CHECK-NEXT: br label [[BB5:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: br i1 [[C_2:%.*]], label [[BB3:%.*]], label [[BB4:%.*]]
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; CHECK: bb3:
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; CHECK-NEXT: call void @readnone_may_throw()
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; CHECK-NEXT: store i32 3, i32* [[P]]
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; CHECK-NEXT: br label [[BB5]]
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; CHECK: bb4:
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; CHECK-NEXT: store i32 5, i32* [[P]]
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; CHECK-NEXT: br label [[BB5]]
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; CHECK: bb5:
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; CHECK-NEXT: call void @use(i32* [[P]])
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; CHECK-NEXT: ret void
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;
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%P = alloca i32
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store i32 1, i32* %P
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br i1 %c.1, label %bb1, label %bb2
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bb1:
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store i32 0, i32* %P
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br label %bb5
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bb2:
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br i1 %c.2, label %bb3, label %bb4
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bb3:
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call void @readnone_may_throw()
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store i32 3, i32* %P
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br label %bb5
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bb4:
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store i32 5, i32* %P
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br label %bb5
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bb5:
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call void @use(i32* %P)
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ret void
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}
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