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-rw-r--r--compiler/optimizing/nodes.cc34
-rw-r--r--test/543-checker-dce-trycatch/smali/TestCase.smali56
2 files changed, 57 insertions, 33 deletions
diff --git a/compiler/optimizing/nodes.cc b/compiler/optimizing/nodes.cc
index 461be25887..926bc156cf 100644
--- a/compiler/optimizing/nodes.cc
+++ b/compiler/optimizing/nodes.cc
@@ -1460,6 +1460,24 @@ void HInstructionList::Add(const HInstructionList& instruction_list) {
}
}
+// Should be called on instructions in a dead block in post order. This method
+// assumes `insn` has been removed from all users with the exception of catch
+// phis because of missing exceptional edges in the graph. It removes the
+// instruction from catch phi uses, together with inputs of other catch phis in
+// the catch block at the same index, as these must be dead too.
+static void RemoveUsesOfDeadInstruction(HInstruction* insn) {
+ DCHECK(!insn->HasEnvironmentUses());
+ while (insn->HasNonEnvironmentUses()) {
+ HUseListNode<HInstruction*>* use = insn->GetUses().GetFirst();
+ size_t use_index = use->GetIndex();
+ HBasicBlock* user_block = use->GetUser()->GetBlock();
+ DCHECK(use->GetUser()->IsPhi() && user_block->IsCatchBlock());
+ for (HInstructionIterator phi_it(user_block->GetPhis()); !phi_it.Done(); phi_it.Advance()) {
+ phi_it.Current()->AsPhi()->RemoveInputAt(use_index);
+ }
+ }
+}
+
void HBasicBlock::DisconnectAndDelete() {
// Dominators must be removed after all the blocks they dominate. This way
// a loop header is removed last, a requirement for correct loop information
@@ -1562,21 +1580,13 @@ void HBasicBlock::DisconnectAndDelete() {
// graph will always remain consistent.
for (HBackwardInstructionIterator it(GetInstructions()); !it.Done(); it.Advance()) {
HInstruction* insn = it.Current();
- while (insn->HasUses()) {
- DCHECK(IsTryBlock());
- HUseListNode<HInstruction*>* use = insn->GetUses().GetFirst();
- size_t use_index = use->GetIndex();
- HBasicBlock* user_block = use->GetUser()->GetBlock();
- DCHECK(use->GetUser()->IsPhi() && user_block->IsCatchBlock());
- for (HInstructionIterator phi_it(user_block->GetPhis()); !phi_it.Done(); phi_it.Advance()) {
- phi_it.Current()->AsPhi()->RemoveInputAt(use_index);
- }
- }
-
+ RemoveUsesOfDeadInstruction(insn);
RemoveInstruction(insn);
}
for (HInstructionIterator it(GetPhis()); !it.Done(); it.Advance()) {
- RemovePhi(it.Current()->AsPhi());
+ HPhi* insn = it.Current()->AsPhi();
+ RemoveUsesOfDeadInstruction(insn);
+ RemovePhi(insn);
}
// Disconnect from the dominator.
diff --git a/test/543-checker-dce-trycatch/smali/TestCase.smali b/test/543-checker-dce-trycatch/smali/TestCase.smali
index 44e907d80e..1756fa4a99 100644
--- a/test/543-checker-dce-trycatch/smali/TestCase.smali
+++ b/test/543-checker-dce-trycatch/smali/TestCase.smali
@@ -202,27 +202,35 @@
# Test that DCE removes catch phi uses of instructions defined in dead try blocks.
## CHECK-START: int TestCase.testCatchPhiInputs_DefinedInTryBlock(int, int, int, int) dead_code_elimination_final (before)
-## CHECK-DAG: <<Arg0:i\d+>> ParameterValue
-## CHECK-DAG: <<Arg1:i\d+>> ParameterValue
-## CHECK-DAG: <<Const0xa:i\d+>> IntConstant 10
-## CHECK-DAG: <<Const0xb:i\d+>> IntConstant 11
-## CHECK-DAG: <<Const0xc:i\d+>> IntConstant 12
-## CHECK-DAG: <<Const0xd:i\d+>> IntConstant 13
-## CHECK-DAG: <<Const0xe:i\d+>> IntConstant 14
-## CHECK-DAG: <<Add:i\d+>> Add [<<Arg0>>,<<Arg1>>]
-## CHECK-DAG: Phi [<<Const0xa>>,<<Const0xb>>,<<Const0xd>>] reg:1 is_catch_phi:true
-## CHECK-DAG: Phi [<<Add>>,<<Const0xc>>,<<Const0xe>>] reg:2 is_catch_phi:true
+## CHECK-DAG: <<Arg0:i\d+>> ParameterValue
+## CHECK-DAG: <<Arg1:i\d+>> ParameterValue
+## CHECK-DAG: <<Const0xa:i\d+>> IntConstant 10
+## CHECK-DAG: <<Const0xb:i\d+>> IntConstant 11
+## CHECK-DAG: <<Const0xc:i\d+>> IntConstant 12
+## CHECK-DAG: <<Const0xd:i\d+>> IntConstant 13
+## CHECK-DAG: <<Const0xe:i\d+>> IntConstant 14
+## CHECK-DAG: <<Const0xf:i\d+>> IntConstant 15
+## CHECK-DAG: <<Const0x10:i\d+>> IntConstant 16
+## CHECK-DAG: <<Const0x11:i\d+>> IntConstant 17
+## CHECK-DAG: <<Add:i\d+>> Add [<<Arg0>>,<<Arg1>>]
+## CHECK-DAG: <<Phi:i\d+>> Phi [<<Add>>,<<Const0xf>>] reg:3 is_catch_phi:false
+## CHECK-DAG: Phi [<<Const0xa>>,<<Const0xb>>,<<Const0xd>>] reg:1 is_catch_phi:true
+## CHECK-DAG: Phi [<<Add>>,<<Const0xc>>,<<Const0xe>>] reg:2 is_catch_phi:true
+## CHECK-DAG: Phi [<<Phi>>,<<Const0x10>>,<<Const0x11>>] reg:3 is_catch_phi:true
## CHECK-START: int TestCase.testCatchPhiInputs_DefinedInTryBlock(int, int, int, int) dead_code_elimination_final (after)
-## CHECK-DAG: <<Const0xb:i\d+>> IntConstant 11
-## CHECK-DAG: <<Const0xc:i\d+>> IntConstant 12
-## CHECK-DAG: <<Const0xd:i\d+>> IntConstant 13
-## CHECK-DAG: <<Const0xe:i\d+>> IntConstant 14
-## CHECK-DAG: Phi [<<Const0xb>>,<<Const0xd>>] reg:1 is_catch_phi:true
-## CHECK-DAG: Phi [<<Const0xc>>,<<Const0xe>>] reg:2 is_catch_phi:true
+## CHECK-DAG: <<Const0xb:i\d+>> IntConstant 11
+## CHECK-DAG: <<Const0xc:i\d+>> IntConstant 12
+## CHECK-DAG: <<Const0xd:i\d+>> IntConstant 13
+## CHECK-DAG: <<Const0xe:i\d+>> IntConstant 14
+## CHECK-DAG: <<Const0x10:i\d+>> IntConstant 16
+## CHECK-DAG: <<Const0x11:i\d+>> IntConstant 17
+## CHECK-DAG: Phi [<<Const0xb>>,<<Const0xd>>] reg:1 is_catch_phi:true
+## CHECK-DAG: Phi [<<Const0xc>>,<<Const0xe>>] reg:2 is_catch_phi:true
+## CHECK-DAG: Phi [<<Const0x10>>,<<Const0x11>>] reg:3 is_catch_phi:true
.method public static testCatchPhiInputs_DefinedInTryBlock(IIII)I
- .registers 7
+ .registers 8
invoke-static {}, LTestCase;->$inline$False()Z
move-result v0
@@ -232,17 +240,24 @@
shr-int/2addr p2, p3
:try_start
- const v1, 0xa # dead catch phi input, defined in entry block
- add-int v2, p0, p1 # dead catch phi input, defined in the dead block
+ const v1, 0xa # dead catch phi input, defined in entry block (HInstruction)
+ add-int v2, p0, p1 # dead catch phi input, defined in the dead block (HInstruction)
+ move v3, v2
+ if-eqz v3, :define_phi
+ const v3, 0xf
+ :define_phi
+ # v3 = Phi [Add, 0xf] # dead catch phi input, defined in the dead block (HPhi)
div-int/2addr p0, v2
:else
const v1, 0xb # live catch phi input
const v2, 0xc # live catch phi input
+ const v3, 0x10 # live catch phi input
div-int/2addr p0, p3
const v1, 0xd # live catch phi input
const v2, 0xe # live catch phi input
+ const v3, 0x11 # live catch phi input
div-int/2addr p0, p1
:try_end
.catchall {:try_start .. :try_end} :catch_all
@@ -252,6 +267,7 @@
:catch_all
sub-int p0, v1, v2 # use catch phi values
+ sub-int p0, p0, v3 # use catch phi values
goto :return
.end method
@@ -260,8 +276,6 @@
# dead try blocks.
## CHECK-START: int TestCase.testCatchPhiInputs_DefinedOutsideTryBlock(int, int, int, int) dead_code_elimination_final (before)
-## CHECK-DAG: <<Arg0:i\d+>> ParameterValue
-## CHECK-DAG: <<Arg1:i\d+>> ParameterValue
## CHECK-DAG: <<Const0xa:i\d+>> IntConstant 10
## CHECK-DAG: <<Const0xb:i\d+>> IntConstant 11
## CHECK-DAG: <<Const0xc:i\d+>> IntConstant 12
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2025-10-21 00:31:29 +0000