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[NFC] Pre-commit NewGVN tests for wrong phi(undef, X) optimization

This commit is contained in:
Nuno Lopes 2021-12-30 15:41:44 +00:00
parent 2e69f4f012
commit 7128bb61fb
1 changed files with 100 additions and 8 deletions
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108
llvm/test/Transforms/NewGVN/phi-edge-handling.ll
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@ -5,7 +5,7 @@
;; Block 6 is reachable, but edge 6->4 is not
;; This means the phi value is undef, not 0
; Function Attrs: ssp uwtable
define i16 @hoge() local_unnamed_addr #0 align 2 {
define i16 @hoge() {
; CHECK-LABEL: @hoge(
; CHECK-NEXT: bb:
; CHECK-NEXT: switch i8 undef, label [[BB7:%.*]] [
@ -21,7 +21,7 @@ define i16 @hoge() local_unnamed_addr #0 align 2 {
; CHECK: bb4:
; CHECK-NEXT: ret i16 undef
; CHECK: bb6:
; CHECK-NEXT: br i1 true, label [[BB3:%.*]], label [[BB4]], !llvm.loop !1
; CHECK-NEXT: br i1 true, label [[BB3:%.*]], label [[BB4]]
; CHECK: bb7:
; CHECK-NEXT: unreachable
;
@ -45,16 +45,108 @@ bb4: ; preds = %bb6, %bb2
ret i16 %tmp
bb6: ; preds = %bb4
br i1 true, label %bb3, label %bb4, !llvm.loop !1
br i1 true, label %bb3, label %bb4
bb7: ; preds = %bb
unreachable
}
attributes #0 = { ssp uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="penryn" "target-features"="+cx16,+fxsr,+mmx,+sse,+sse2,+sse3,+sse4.1,+ssse3,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
define i8 @only_undef(i1 %cond) {
; CHECK-LABEL: @only_undef(
; CHECK-NEXT: br i1 [[COND:%.*]], label [[A:%.*]], label [[B:%.*]]
; CHECK: A:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: B:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: EXIT:
; CHECK-NEXT: ret i8 undef
;
br i1 %cond, label %A, label %B
A:
br label %EXIT
B:
br label %EXIT
EXIT:
%r = phi i8 [undef, %A], [undef, %B]
ret i8 %r
}
!llvm.ident = !{!0}
define i8 @only_poison(i1 %cond) {
; CHECK-LABEL: @only_poison(
; CHECK-NEXT: br i1 [[COND:%.*]], label [[A:%.*]], label [[B:%.*]]
; CHECK: A:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: B:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: EXIT:
; CHECK-NEXT: ret i8 poison
;
br i1 %cond, label %A, label %B
A:
br label %EXIT
B:
br label %EXIT
EXIT:
%r = phi i8 [poison, %A], [poison, %B]
ret i8 %r
}
!0 = !{!"clang version 5.0.0"}
!1 = distinct !{!1, !2}
!2 = !{!"llvm.loop.unroll.disable"}
define i8 @undef_poison(i1 %cond) {
; CHECK-LABEL: @undef_poison(
; CHECK-NEXT: br i1 [[COND:%.*]], label [[A:%.*]], label [[B:%.*]]
; CHECK: A:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: B:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: EXIT:
; CHECK-NEXT: ret i8 undef
;
br i1 %cond, label %A, label %B
A:
br label %EXIT
B:
br label %EXIT
EXIT:
%r = phi i8 [undef, %A], [poison, %B]
ret i8 %r
}
define i8 @value_undef(i1 %cond, i8 %v) {
; CHECK-LABEL: @value_undef(
; CHECK-NEXT: br i1 [[COND:%.*]], label [[A:%.*]], label [[B:%.*]]
; CHECK: A:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: B:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: EXIT:
; CHECK-NEXT: ret i8 [[V:%.*]]
;
br i1 %cond, label %A, label %B
A:
br label %EXIT
B:
br label %EXIT
EXIT:
%r = phi i8 [undef, %A], [%v, %B]
ret i8 %r
}
define i8 @value_poison(i1 %cond, i8 %v) {
; CHECK-LABEL: @value_poison(
; CHECK-NEXT: br i1 [[COND:%.*]], label [[A:%.*]], label [[B:%.*]]
; CHECK: A:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: B:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: EXIT:
; CHECK-NEXT: ret i8 [[V:%.*]]
;
br i1 %cond, label %A, label %B
A:
br label %EXIT
B:
br label %EXIT
EXIT:
%r = phi i8 [poison, %A], [%v, %B]
ret i8 %r
}