[llvm] r265158 - [InstCombine] Don't sink an instr after a catchswitch
David Majnemer via llvm-commits
llvm-commits at lists.llvm.org
Fri Apr 1 10:28:17 PDT 2016
Author: majnemer
Date: Fri Apr 1 12:28:17 2016
New Revision: 265158
URL: http://llvm.org/viewvc/llvm-project?rev=265158&view=rev
Log:
[InstCombine] Don't sink an instr after a catchswitch
A catchswitch is a terminator, instructions cannot be inserted after it.
Added:
llvm/trunk/test/Transforms/InstCombine/sink-into-catchswitch.ll
Modified:
llvm/trunk/lib/Transforms/InstCombine/InstructionCombining.cpp
Modified: llvm/trunk/lib/Transforms/InstCombine/InstructionCombining.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/InstCombine/InstructionCombining.cpp?rev=265158&r1=265157&r2=265158&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/InstCombine/InstructionCombining.cpp (original)
+++ llvm/trunk/lib/Transforms/InstCombine/InstructionCombining.cpp Fri Apr 1 12:28:17 2016
@@ -2724,12 +2724,15 @@ static bool TryToSinkInstruction(Instruc
&DestBlock->getParent()->getEntryBlock())
return false;
+ // Do not sink into catchswitch blocks.
+ if (isa<CatchSwitchInst>(DestBlock->getTerminator()))
+ return false;
+
// Do not sink convergent call instructions.
if (auto *CI = dyn_cast<CallInst>(I)) {
if (CI->isConvergent())
return false;
}
-
// We can only sink load instructions if there is nothing between the load and
// the end of block that could change the value.
if (I->mayReadFromMemory()) {
@@ -2823,6 +2826,7 @@ bool InstCombiner::run() {
if (UserIsSuccessor && UserParent->getSinglePredecessor()) {
// Okay, the CFG is simple enough, try to sink this instruction.
if (TryToSinkInstruction(I, UserParent)) {
+ DEBUG(dbgs() << "IC: Sink: " << *I << '\n');
MadeIRChange = true;
// We'll add uses of the sunk instruction below, but since sinking
// can expose opportunities for it's *operands* add them to the
Added: llvm/trunk/test/Transforms/InstCombine/sink-into-catchswitch.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/sink-into-catchswitch.ll?rev=265158&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/sink-into-catchswitch.ll (added)
+++ llvm/trunk/test/Transforms/InstCombine/sink-into-catchswitch.ll Fri Apr 1 12:28:17 2016
@@ -0,0 +1,45 @@
+; RUN: opt -instcombine -S < %s | FileCheck %s
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc18.0.0"
+
+%struct.B = type { i64, i64 }
+
+define void @test1(%struct.B* %p) personality i32 (...)* @__CxxFrameHandler3 {
+invoke.cont:
+ %0 = bitcast %struct.B* %p to <2 x i64>*
+ %1 = load <2 x i64>, <2 x i64>* %0, align 8
+ %2 = extractelement <2 x i64> %1, i32 0
+ invoke void @throw()
+ to label %unreachable unwind label %catch.dispatch
+
+catch.dispatch: ; preds = %invoke.cont
+ %cs = catchswitch within none [label %invoke.cont1] unwind label %ehcleanup
+
+invoke.cont1: ; preds = %catch.dispatch
+ %catch = catchpad within %cs [i8* null, i32 64, i8* null]
+ invoke void @throw() [ "funclet"(token %catch) ]
+ to label %unreachable unwind label %ehcleanup
+
+ehcleanup: ; preds = %invoke.cont1, %catch.dispatch
+ %phi = phi i64 [ %2, %catch.dispatch ], [ 9, %invoke.cont1 ]
+ %cleanup = cleanuppad within none []
+ call void @release(i64 %phi) [ "funclet"(token %cleanup) ]
+ cleanupret from %cleanup unwind to caller
+
+unreachable: ; preds = %invoke.cont1, %invoke.cont
+ unreachable
+}
+
+; CHECK-LABEL: define void @test1(
+; CHECK: %[[bc:.*]] = bitcast %struct.B* %p to <2 x i64>*
+; CHECK: %[[ld:.*]] = load <2 x i64>, <2 x i64>* %[[bc]], align 8
+; CHECK: %[[ee:.*]] = extractelement <2 x i64> %[[ld]], i32 0
+
+; CHECK: %[[phi:.*]] = phi i64 [ %[[ee]], {{.*}} ], [ 9, {{.*}} ]
+; CHECK: call void @release(i64 %[[phi]])
+
+declare i32 @__CxxFrameHandler3(...)
+
+declare void @throw()
+
+declare void @release(i64)
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