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llvm-mirror/test/Transforms/NewGVN/phi-of-ops-simplified-to-existing-value-then-changes-again.ll
Florian Hahn 69b0c6315b [NewGVN] Add phi-of-ops operands if no real PHI is created. 
If the PHI-of-ops simplifies to an existing value, no real PHI is
created, which means the dependencies between the
PHI-of-ops and its operands is not materialized in IR. At the
moment, we fail to create a real PHI node for the PHI-of-ops,
because the PHI-of-ops root instruction is not re-visited if
one of the PHI-of-ops operands changes. We need to add the
operands as additional users in this case.

Even with this patch, there are still some dependencies
missing. I will continue tackling the outstanding
reporeted crashes in this area.

Fixes PR36501, PR42422, PR42557.

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D66924
2021-04-15 08:25:10 +01:00

240 lines
8.2 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -newgvn -S %s | FileCheck %s
; Test cases where initially a PHI-of-ops can be simplified to an existing
; value, but later we need to revisit the decision because the leader of
; one of the operands used for the simplification changed.
declare void @use(i1)
define void @pr36501(i1 %c) {
; CHECK-LABEL: @pr36501(
; CHECK-NEXT: bb:
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[PHI_1:%.*]] = phi i32 [ -2022207984, [[BB:%.*]] ], [ 0, [[BB7:%.*]] ]
; CHECK-NEXT: br i1 [[C:%.*]], label [[BB3:%.*]], label [[BB2:%.*]]
; CHECK: bb2:
; CHECK-NEXT: br label [[BB3]]
; CHECK: bb3:
; CHECK-NEXT: [[PHI_2:%.*]] = phi i32 [ -1, [[BB2]] ], [ [[PHI_1]], [[BB1]] ]
; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[PHI_2]], 0
; CHECK-NEXT: br i1 [[TMP5]], label [[BB6:%.*]], label [[BB7]]
; CHECK: bb6:
; CHECK-NEXT: br label [[BB7]]
; CHECK: bb7:
; CHECK-NEXT: [[PHIOFOPS:%.*]] = phi i1 [ [[TMP5]], [[BB3]] ], [ true, [[BB6]] ]
; CHECK-NEXT: [[PHI_3:%.*]] = phi i32 [ [[PHI_2]], [[BB3]] ], [ 0, [[BB6]] ]
; CHECK-NEXT: call void @use(i1 [[PHIOFOPS]])
; CHECK-NEXT: br label [[BB1]]
;
bb:
br label %bb1
bb1:
%phi.1 = phi i32 [ -2022207984, %bb ], [ 0, %bb7 ]
br i1 %c, label %bb3, label %bb2
bb2:
br label %bb3
bb3:
%phi.2 = phi i32 [ -1, %bb2 ], [ %phi.1, %bb1 ]
%tmp5 = icmp eq i32 %phi.2, 0
br i1 %tmp5, label %bb6, label %bb7
bb6:
br label %bb7
bb7: ; preds = %bb6, %bb3
%phi.3 = phi i32 [ %phi.2, %bb3 ], [ 0, %bb6 ]
%tmp9 = icmp eq i32 %phi.3, 0
call void @use(i1 %tmp9)
br label %bb1
}
define void @pr42422(i1 %c.1, i1 %c.2) {
; CHECK-LABEL: @pr42422(
; CHECK-NEXT: bb:
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: br label [[BB2:%.*]]
; CHECK: bb2:
; CHECK-NEXT: [[TMP:%.*]] = phi i32 [ [[TMP23:%.*]], [[BB22:%.*]] ], [ 0, [[BB1]] ]
; CHECK-NEXT: [[TMP3:%.*]] = icmp sle i32 [[TMP]], 1
; CHECK-NEXT: br i1 [[TMP3]], label [[BB4:%.*]], label [[BB24:%.*]]
; CHECK: bb4:
; CHECK-NEXT: br i1 [[C_1:%.*]], label [[BB5:%.*]], label [[BB6:%.*]]
; CHECK: bb5:
; CHECK-NEXT: br label [[BB19:%.*]]
; CHECK: bb6:
; CHECK-NEXT: br i1 [[C_2:%.*]], label [[BB7:%.*]], label [[BB8:%.*]]
; CHECK: bb7:
; CHECK-NEXT: br label [[BB16:%.*]]
; CHECK: bb8:
; CHECK-NEXT: [[TMP9:%.*]] = phi i64 [ [[TMP12:%.*]], [[BB11:%.*]] ], [ 0, [[BB6]] ]
; CHECK-NEXT: [[TMP10:%.*]] = icmp sle i64 [[TMP9]], 1
; CHECK-NEXT: br i1 [[TMP10]], label [[BB11]], label [[BB13:%.*]]
; CHECK: bb11:
; CHECK-NEXT: [[TMP12]] = add nsw i64 [[TMP9]], 1
; CHECK-NEXT: br label [[BB8]]
; CHECK: bb13:
; CHECK-NEXT: br i1 true, label [[BB14:%.*]], label [[BB15:%.*]]
; CHECK: bb14:
; CHECK-NEXT: br label [[BB16]]
; CHECK: bb15:
; CHECK-NEXT: store i8 undef, i8* null, align 1
; CHECK-NEXT: br label [[BB16]]
; CHECK: bb16:
; CHECK-NEXT: [[TMP17:%.*]] = phi i32 [ undef, [[BB15]] ], [ 1, [[BB14]] ], [ 9, [[BB7]] ]
; CHECK-NEXT: switch i32 [[TMP17]], label [[BB19]] [
; CHECK-NEXT: i32 0, label [[BB6]]
; CHECK-NEXT: i32 9, label [[BB18:%.*]]
; CHECK-NEXT: ]
; CHECK: bb18:
; CHECK-NEXT: br label [[BB19]]
; CHECK: bb19:
; CHECK-NEXT: [[TMP20:%.*]] = phi i32 [ 0, [[BB18]] ], [ [[TMP17]], [[BB16]] ], [ 1, [[BB5]] ]
; CHECK-NEXT: [[TMP21:%.*]] = icmp eq i32 [[TMP20]], 0
; CHECK-NEXT: br i1 [[TMP21]], label [[BB22]], label [[BB25:%.*]]
; CHECK: bb22:
; CHECK-NEXT: [[TMP23]] = add nsw i32 [[TMP]], 1
; CHECK-NEXT: br label [[BB2]]
; CHECK: bb24:
; CHECK-NEXT: br label [[BB25]]
; CHECK: bb25:
; CHECK-NEXT: [[PHIOFOPS:%.*]] = phi i1 [ true, [[BB24]] ], [ [[TMP21]], [[BB19]] ]
; CHECK-NEXT: [[TMP26:%.*]] = phi i32 [ [[TMP20]], [[BB19]] ], [ 0, [[BB24]] ]
; CHECK-NEXT: br i1 [[PHIOFOPS]], label [[BB1]], label [[BB28:%.*]]
; CHECK: bb28:
; CHECK-NEXT: ret void
;
bb:
br label %bb1
bb1: ; preds = %bb25, %bb
br label %bb2
bb2: ; preds = %bb22, %bb1
%tmp = phi i32 [ %tmp23, %bb22 ], [ 0, %bb1 ]
%tmp3 = icmp sle i32 %tmp, 1
br i1 %tmp3, label %bb4, label %bb24
bb4: ; preds = %bb2
br i1 %c.1, label %bb5, label %bb6
bb5: ; preds = %bb4
br label %bb19
bb6: ; preds = %bb16, %bb4
br i1 %c.2, label %bb7, label %bb8
bb7: ; preds = %bb6
br label %bb16
bb8: ; preds = %bb11, %bb6
%tmp9 = phi i64 [ %tmp12, %bb11 ], [ 0, %bb6 ]
%tmp10 = icmp sle i64 %tmp9, 1
br i1 %tmp10, label %bb11, label %bb13
bb11: ; preds = %bb8
%tmp12 = add nsw i64 %tmp9, 1
br label %bb8
bb13: ; preds = %bb8
br i1 true, label %bb14, label %bb15
bb14: ; preds = %bb13
br label %bb16
bb15: ; preds = %bb13
br label %bb16
bb16: ; preds = %bb15, %bb14, %bb7
%tmp17 = phi i32 [ undef, %bb15 ], [ 1, %bb14 ], [ 9, %bb7 ]
switch i32 %tmp17, label %bb19 [
i32 0, label %bb6
i32 9, label %bb18
]
bb18: ; preds = %bb16
br label %bb19
bb19: ; preds = %bb18, %bb16, %bb5
%tmp20 = phi i32 [ 0, %bb18 ], [ %tmp17, %bb16 ], [ 1, %bb5 ]
%tmp21 = icmp eq i32 %tmp20, 0
br i1 %tmp21, label %bb22, label %bb25
bb22: ; preds = %bb19
%tmp23 = add nsw i32 %tmp, 1
br label %bb2
bb24: ; preds = %bb2
br label %bb25
bb25: ; preds = %bb24, %bb19
%tmp26 = phi i32 [ %tmp20, %bb19 ], [ 0, %bb24 ]
%tmp27 = icmp eq i32 %tmp26, 0
br i1 %tmp27, label %bb1, label %bb28
bb28: ; preds = %bb25
ret void
}
define void @PR42557(i32 %tmp6, i1 %c.1, i1 %c.2) {
; CHECK-LABEL: @PR42557(
; CHECK-NEXT: bb:
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[TMP:%.*]] = phi i32 [ 0, [[BB:%.*]] ], [ [[TMP6:%.*]], [[BB1]] ]
; CHECK-NEXT: br i1 [[C_1:%.*]], label [[BB2:%.*]], label [[BB1]]
; CHECK: bb2:
; CHECK-NEXT: br i1 [[C_2:%.*]], label [[BB16:%.*]], label [[BB11:%.*]]
; CHECK: bb16:
; CHECK-NEXT: [[TMP17:%.*]] = add i32 [[TMP]], 1
; CHECK-NEXT: br label [[BB11]]
; CHECK: bb11:
; CHECK-NEXT: [[TMP12:%.*]] = phi i32 [ [[TMP17]], [[BB16]] ], [ 0, [[BB2]] ]
; CHECK-NEXT: [[TMP13:%.*]] = icmp eq i32 [[TMP12]], 0
; CHECK-NEXT: call void @use(i1 [[TMP13]])
; CHECK-NEXT: [[TMP15:%.*]] = icmp ne i32 [[TMP]], 0
; CHECK-NEXT: br i1 [[TMP15]], label [[BB18:%.*]], label [[BB19:%.*]]
; CHECK: bb18:
; CHECK-NEXT: br label [[BB19]]
; CHECK: bb19:
; CHECK-NEXT: [[PHIOFOPS:%.*]] = phi i1 [ [[TMP13]], [[BB11]] ], [ false, [[BB18]] ]
; CHECK-NEXT: [[TMP20:%.*]] = phi i32 [ [[TMP12]], [[BB11]] ], [ 1, [[BB18]] ]
; CHECK-NEXT: call void @use(i1 [[PHIOFOPS]])
; CHECK-NEXT: ret void
;
bb:
br label %bb1
bb1: ; preds = %bb1, %bb
%tmp = phi i32 [ 0, %bb ], [ %tmp6, %bb1 ]
br i1 %c.1, label %bb2, label %bb1
bb2: ; preds = %bb1
br i1 %c.2, label %bb16, label %bb11
bb16: ; preds = %bb2
%tmp17 = add i32 %tmp, 1
br label %bb11
bb11: ; preds = %bb16, %bb2
%tmp12 = phi i32 [ %tmp17, %bb16 ], [ 0, %bb2 ]
%tmp13 = icmp eq i32 %tmp12, 0
call void @use(i1 %tmp13)
%tmp15 = icmp ne i32 %tmp, 0
br i1 %tmp15, label %bb18, label %bb19
bb18: ; preds = %bb11
br label %bb19
bb19: ; preds = %bb18, %bb11
%tmp20 = phi i32 [ %tmp12, %bb11 ], [ 1, %bb18 ]
%tmp21 = icmp eq i32 %tmp20, 0
call void @use(i1 %tmp21)
ret void
}
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