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llvm-project/llvm/test/Transforms/DeadStoreElimination/MSSA/multiblock-simple.ll
Florian Hahn 9d172c8e9c Recommit "[DSE] Switch to MemorySSA-backed DSE by default." 
This switches to using DSE + MemorySSA by default again, after
fixing the issues reported after the first commit.

Notable fixes fc8200633122, a0017c2bc258.

This reverts commit 3a59628f3cc26eb085acfc9cbdc97243ef71a6c5.
2020-09-18 11:05:00 +01:00

246 lines
5.8 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -basic-aa -dse -S | FileCheck %s
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
define void @test2(i32* noalias %P) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: br label [[BB3:%.*]]
; CHECK: bb2:
; CHECK-NEXT: br label [[BB3]]
; CHECK: bb3:
; CHECK-NEXT: store i32 0, i32* [[P:%.*]], align 4
; CHECK-NEXT: ret void
;
store i32 1, i32* %P
br i1 true, label %bb1, label %bb2
bb1:
br label %bb3
bb2:
br label %bb3
bb3:
store i32 0, i32* %P
ret void
}
define void @test3(i32* noalias %P) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: store i32 0, i32* [[P:%.*]], align 4
; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: br label [[BB3:%.*]]
; CHECK: bb2:
; CHECK-NEXT: store i32 0, i32* [[P]], align 4
; CHECK-NEXT: br label [[BB3]]
; CHECK: bb3:
; CHECK-NEXT: ret void
;
store i32 0, i32* %P
br i1 true, label %bb1, label %bb2
bb1:
br label %bb3
bb2:
store i32 0, i32* %P
br label %bb3
bb3:
ret void
}
define void @test7(i32* noalias %P, i32* noalias %Q) {
; CHECK-LABEL: @test7(
; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* [[P:%.*]], align 4
; CHECK-NEXT: br label [[BB3:%.*]]
; CHECK: bb2:
; CHECK-NEXT: br label [[BB3]]
; CHECK: bb3:
; CHECK-NEXT: store i32 0, i32* [[Q:%.*]], align 4
; CHECK-NEXT: store i32 0, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
store i32 1, i32* %Q
br i1 true, label %bb1, label %bb2
bb1:
load i32, i32* %P
br label %bb3
bb2:
br label %bb3
bb3:
store i32 0, i32* %Q
store i32 0, i32* %P
ret void
}
define i32 @test22(i32* %P, i32* noalias %Q, i32* %R) {
; CHECK-LABEL: @test22(
; CHECK-NEXT: store i32 2, i32* [[P:%.*]], align 4
; CHECK-NEXT: store i32 3, i32* [[Q:%.*]], align 4
; CHECK-NEXT: [[L:%.*]] = load i32, i32* [[R:%.*]], align 4
; CHECK-NEXT: ret i32 [[L]]
;
store i32 1, i32* %Q
store i32 2, i32* %P
store i32 3, i32* %Q
%l = load i32, i32* %R
ret i32 %l
}
define void @test9(i32* noalias %P) {
; CHECK-LABEL: @test9(
; CHECK-NEXT: store i32 0, i32* [[P:%.*]], align 4
; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: br label [[BB3:%.*]]
; CHECK: bb2:
; CHECK-NEXT: ret void
; CHECK: bb3:
; CHECK-NEXT: store i32 0, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
store i32 0, i32* %P
br i1 true, label %bb1, label %bb2
bb1:
br label %bb3
bb2:
ret void
bb3:
store i32 0, i32* %P
ret void
}
; We cannot eliminate `store i32 0, i32* %P`, as it is read by the later load.
; Make sure that we check the uses of `store i32 1, i32* %P.1 which does not
; alias %P. Note that uses point to the *first* def that may alias.
define void @overlapping_read(i32* %P) {
; CHECK-LABEL: @overlapping_read(
; CHECK-NEXT: store i32 0, i32* [[P:%.*]], align 4
; CHECK-NEXT: [[P_1:%.*]] = getelementptr i32, i32* [[P]], i32 1
; CHECK-NEXT: store i32 1, i32* [[P_1]], align 4
; CHECK-NEXT: [[P_64:%.*]] = bitcast i32* [[P]] to i64*
; CHECK-NEXT: [[LV:%.*]] = load i64, i64* [[P_64]], align 8
; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: br label [[BB3:%.*]]
; CHECK: bb2:
; CHECK-NEXT: br label [[BB3]]
; CHECK: bb3:
; CHECK-NEXT: store i32 2, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
store i32 0, i32* %P
%P.1 = getelementptr i32, i32* %P, i32 1
store i32 1, i32* %P.1
%P.64 = bitcast i32* %P to i64*
%lv = load i64, i64* %P.64
br i1 true, label %bb1, label %bb2
bb1:
br label %bb3
bb2:
br label %bb3
bb3:
store i32 2, i32* %P
ret void
}
define void @test10(i32* %P) {
; CHECK-LABEL: @test10(
; CHECK-NEXT: store i32 0, i32* [[P:%.*]], align 4
; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: store i32 0, i32* [[P]], align 4
; CHECK-NEXT: br label [[BB3:%.*]]
; CHECK: bb2:
; CHECK-NEXT: ret void
; CHECK: bb3:
; CHECK-NEXT: ret void
;
store i32 0, i32* %P
br i1 true, label %bb1, label %bb2
bb1:
store i32 0, i32* %P
br label %bb3
bb2:
ret void
bb3:
ret void
}
define void @test11() {
; CHECK-LABEL: @test11(
; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: br label [[BB3:%.*]]
; CHECK: bb2:
; CHECK-NEXT: ret void
; CHECK: bb3:
; CHECK-NEXT: ret void
;
%P = alloca i32
store i32 0, i32* %P
br i1 true, label %bb1, label %bb2
bb1:
store i32 0, i32* %P
br label %bb3
bb2:
ret void
bb3:
ret void
}
define void @test12(i32* %P) {
; CHECK-LABEL: @test12(
; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: store i32 1, i32* [[P:%.*]], align 4
; CHECK-NEXT: br label [[BB3:%.*]]
; CHECK: bb2:
; CHECK-NEXT: store i32 1, i32* [[P]], align 4
; CHECK-NEXT: ret void
; CHECK: bb3:
; CHECK-NEXT: ret void
;
store i32 0, i32* %P
br i1 true, label %bb1, label %bb2
bb1:
store i32 1, i32* %P
br label %bb3
bb2:
store i32 1, i32* %P
ret void
bb3:
ret void
}
define void @test13(i32* %P) {
; CHECK-LABEL: @test13(
; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: store i32 1, i32* [[P:%.*]], align 4
; CHECK-NEXT: br label [[BB3:%.*]]
; CHECK: bb2:
; CHECK-NEXT: store i32 1, i32* [[P]], align 4
; CHECK-NEXT: br label [[BB3]]
; CHECK: bb3:
; CHECK-NEXT: ret void
;
store i32 0, i32* %P
br i1 true, label %bb1, label %bb2
bb1:
store i32 1, i32* %P
br label %bb3
bb2:
store i32 1, i32* %P
br label %bb3
bb3:
ret void
}
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