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[DSE] Add tests with stores of existing values.

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This patch pre-commits test cases with dead stores of
existing values for D90328. It also updates a few tests that had such
stores by accident, to preserve the original spirit of those tests.
This commit is contained in:
Florian Hahn 2021-01-13 21:28:25 +00:00
parent 4c62220bd7
commit ca3e71391e
4 changed files with 294 additions and 10 deletions
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4
test/Transforms/DeadStoreElimination/MSSA/multiblock-loops.ll
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@ -183,7 +183,7 @@ define void @loop_multiple_def_uses(i32* noalias %P) {
; CHECK-NEXT: [[C1:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[C1]], label [[FOR_BODY:%.*]], label [[END:%.*]]
; CHECK: for.body:
; CHECK-NEXT: store i32 1, i32* [[P]], align 4
; CHECK-NEXT: store i32 2, i32* [[P]], align 4
; CHECK-NEXT: [[LV:%.*]] = load i32, i32* [[P]], align 4
; CHECK-NEXT: br label [[FOR_HEADER]]
; CHECK: end:
@ -199,7 +199,7 @@ for.header:
br i1 %c1, label %for.body, label %end
for.body:
store i32 1, i32* %P, align 4
store i32 2, i32* %P, align 4
%lv = load i32, i32* %P
br label %for.header

4
test/Transforms/DeadStoreElimination/MSSA/multiblock-memoryphis.ll
View File

@ -14,7 +14,7 @@ define void @test4(i32* noalias %P) {
; CHECK-NEXT: [[X:%.*]] = load i32, i32* [[P]], align 4
; CHECK-NEXT: br label [[BB3]]
; CHECK: bb3:
; CHECK-NEXT: store i32 0, i32* [[P]], align 4
; CHECK-NEXT: store i32 1, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
store i32 0, i32* %P
@ -25,7 +25,7 @@ bb2:
%x = load i32, i32* %P
br label %bb3
bb3:
store i32 0, i32* %P
store i32 1, i32* %P
ret void
}

12
test/Transforms/DeadStoreElimination/MSSA/multiblock-simple.ll
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@ -33,7 +33,7 @@ define void @test3(i32* noalias %P) {
; CHECK: bb1:
; CHECK-NEXT: br label [[BB3:%.*]]
; CHECK: bb2:
; CHECK-NEXT: store i32 0, i32* [[P]], align 4
; CHECK-NEXT: store i32 1, i32* [[P]], align 4
; CHECK-NEXT: br label [[BB3]]
; CHECK: bb3:
; CHECK-NEXT: ret void
@ -43,7 +43,7 @@ define void @test3(i32* noalias %P) {
bb1:
br label %bb3
bb2:
store i32 0, i32* %P
store i32 1, i32* %P
br label %bb3
bb3:
ret void
@ -99,7 +99,7 @@ define void @test9(i32* noalias %P) {
; CHECK: bb2:
; CHECK-NEXT: ret void
; CHECK: bb3:
; CHECK-NEXT: store i32 0, i32* [[P]], align 4
; CHECK-NEXT: store i32 1, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
store i32 0, i32* %P
@ -109,7 +109,7 @@ bb1:
bb2:
ret void
bb3:
store i32 0, i32* %P
store i32 1, i32* %P
ret void
}
@ -153,7 +153,7 @@ define void @test10(i32* %P) {
; 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: store i32 1, i32* [[P]], align 4
; CHECK-NEXT: br label [[BB3:%.*]]
; CHECK: bb2:
; CHECK-NEXT: ret void
@ -163,7 +163,7 @@ define void @test10(i32* %P) {
store i32 0, i32* %P
br i1 true, label %bb1, label %bb2
bb1:
store i32 0, i32* %P
store i32 1, i32* %P
br label %bb3
bb2:
ret void

284
test/Transforms/DeadStoreElimination/MSSA/stores-of-existing-values.ll Normal file
View File

@ -0,0 +1,284 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -basic-aa -dse -S %s | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
; Test case for PR16520. The store in %if.then is dead, because the same value
; has been stored earlier to the same location.
define void @test1_pr16520(i1 %b, i8* nocapture %r) {
; CHECK-LABEL: @test1_pr16520(
; CHECK-NEXT: entry:
; CHECK-NEXT: store i8 1, i8* [[R:%.*]], align 1
; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
; CHECK: if.then:
; CHECK-NEXT: store i8 1, i8* [[R]], align 1
; CHECK-NEXT: tail call void @fn_mayread_or_clobber()
; CHECK-NEXT: br label [[IF_END:%.*]]
; CHECK: if.else:
; CHECK-NEXT: tail call void @fn_mayread_or_clobber()
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: ret void
;
entry:
store i8 1, i8* %r, align 1
br i1 %b, label %if.then, label %if.else
if.then: ; preds = %entry
store i8 1, i8* %r, align 1
tail call void @fn_mayread_or_clobber()
br label %if.end
if.else: ; preds = %entry
tail call void @fn_mayread_or_clobber()
br label %if.end
if.end: ; preds = %if.else, %if.then
ret void
}
declare void @fn_mayread_or_clobber()
declare void @fn_readonly() readonly
define void @test2(i1 %b, i8* nocapture %r) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: entry:
; CHECK-NEXT: store i8 1, i8* [[R:%.*]], align 1
; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
; CHECK: if.then:
; CHECK-NEXT: tail call void @fn_readonly()
; CHECK-NEXT: br label [[IF_END:%.*]]
; CHECK: if.else:
; CHECK-NEXT: tail call void @fn_readonly()
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: store i8 1, i8* [[R]], align 1
; CHECK-NEXT: ret void
;
entry:
store i8 1, i8* %r, align 1
br i1 %b, label %if.then, label %if.else
if.then: ; preds = %entry
tail call void @fn_readonly()
br label %if.end
if.else: ; preds = %entry
tail call void @fn_readonly()
br label %if.end
if.end: ; preds = %if.else, %if.then
store i8 1, i8* %r, align 1
ret void
}
define void @test3(i1 %b, i8* nocapture %r) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: entry:
; CHECK-NEXT: store i8 1, i8* [[R:%.*]], align 1
; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
; CHECK: if.then:
; CHECK-NEXT: tail call void @fn_mayread_or_clobber()
; CHECK-NEXT: br label [[IF_END:%.*]]
; CHECK: if.else:
; CHECK-NEXT: tail call void @fn_readonly()
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: store i8 1, i8* [[R]], align 1
; CHECK-NEXT: ret void
;
entry:
store i8 1, i8* %r, align 1
br i1 %b, label %if.then, label %if.else
if.then: ; preds = %entry
tail call void @fn_mayread_or_clobber()
br label %if.end
if.else: ; preds = %entry
tail call void @fn_readonly()
br label %if.end
if.end: ; preds = %if.else, %if.then
store i8 1, i8* %r, align 1
ret void
}
define void @test4(i1 %b, i8* nocapture %r) {
; CHECK-LABEL: @test4(
; CHECK-NEXT: entry:
; CHECK-NEXT: store i8 1, i8* [[R:%.*]], align 1
; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
; CHECK: if.then:
; CHECK-NEXT: tail call void @fn_readonly()
; CHECK-NEXT: br label [[IF_END:%.*]]
; CHECK: if.else:
; CHECK-NEXT: tail call void @fn_mayread_or_clobber()
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: store i8 1, i8* [[R]], align 1
; CHECK-NEXT: ret void
;
entry:
store i8 1, i8* %r, align 1
br i1 %b, label %if.then, label %if.else
if.then: ; preds = %entry
tail call void @fn_readonly()
br label %if.end
if.else: ; preds = %entry
tail call void @fn_mayread_or_clobber()
br label %if.end
if.end: ; preds = %if.else, %if.then
store i8 1, i8* %r, align 1
ret void
}
define void @test5(i1 %b, i8* nocapture %r) {
; CHECK-LABEL: @test5(
; CHECK-NEXT: entry:
; CHECK-NEXT: store i8 1, i8* [[R:%.*]], align 1
; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
; CHECK: if.then:
; CHECK-NEXT: tail call void @fn_readonly()
; CHECK-NEXT: br label [[IF_END:%.*]]
; CHECK: if.else:
; CHECK-NEXT: tail call void @fn_mayread_or_clobber()
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: store i8 1, i8* [[R]], align 1
; CHECK-NEXT: ret void
;
entry:
store i8 1, i8* %r, align 1
br i1 %b, label %if.then, label %if.else
if.then: ; preds = %entry
tail call void @fn_readonly()
br label %if.end
if.else: ; preds = %entry
tail call void @fn_mayread_or_clobber()
br label %if.end
if.end: ; preds = %if.else, %if.then
store i8 1, i8* %r, align 1
ret void
}
declare i1 @cond() readnone
define void @test6(i32* noalias %P) {
; CHECK-LABEL: @test6(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_HEADER:%.*]]
; CHECK: for.header:
; CHECK-NEXT: store i32 1, i32* [[P:%.*]], align 4
; CHECK-NEXT: [[C1:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[C1]], label [[FOR_BODY:%.*]], label [[END:%.*]]
; CHECK: for.body:
; CHECK-NEXT: store i32 1, i32* [[P]], align 4
; CHECK-NEXT: [[LV:%.*]] = load i32, i32* [[P]], align 4
; CHECK-NEXT: br label [[FOR_HEADER]]
; CHECK: end:
; CHECK-NEXT: store i32 3, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
entry:
br label %for.header
for.header:
store i32 1, i32* %P, align 4
%c1 = call i1 @cond()
br i1 %c1, label %for.body, label %end
for.body:
store i32 1, i32* %P, align 4
%lv = load i32, i32* %P
br label %for.header
end:
store i32 3, i32* %P, align 4
ret void
}
; Make sure the store in %bb3 can be eliminated in the presences of early returns.
define void @test7(i32* noalias %P) {
; CHECK-LABEL: @test7(
; 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
}
; Make sure the store in %bb3 won't be eliminated because it may be clobbered before.
define void @test8(i32* noalias %P) {
; CHECK-LABEL: @test8(
; CHECK-NEXT: store i32 0, i32* [[P:%.*]], align 4
; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: call void @fn_mayread_or_clobber()
; 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:
call void @fn_mayread_or_clobber()
br label %bb3
bb2:
ret void
bb3:
store i32 0, i32* %P
ret void
}
; Make sure the store in %bb3 will be eliminated because only the early exit path
; may be clobbered.
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: call void @fn_mayread_or_clobber()
; 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:
call void @fn_mayread_or_clobber()
ret void
bb3:
store i32 0, i32* %P
ret void
}