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[RS4GC] Add support for 'freeze' instruction to findBaseDefiningValue 

Because this instruction is a noop, we can simply go through it in
search of the base.
This commit is contained in:
Max Kazantsev 2022-05-06 20:42:30 +07:00
parent 07a83b5564
commit 5a08e81779
2 changed files with 28 additions and 0 deletions
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3
llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
View File

@ -560,6 +560,9 @@ static BaseDefiningValueResult findBaseDefiningValue(Value *I) {
// The base of this GEP is the base
return findBaseDefiningValue(GEP->getPointerOperand());
if (auto *Freeze = dyn_cast<FreezeInst>(I))
return findBaseDefiningValue(Freeze->getOperand(0));
if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(I)) {
switch (II->getIntrinsicID()) {
default:

25
llvm/test/Transforms/RewriteStatepointsForGC/pr55308.ll Normal file
View File

@ -0,0 +1,25 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=rewrite-statepoints-for-gc -S < %s | FileCheck %s
define void @test() gc "statepoint-example" personality i32* ()* @zot{
; CHECK-LABEL: @test(
; CHECK-NEXT: bb:
; CHECK-NEXT: [[TMP:%.*]] = freeze i8 addrspace(1)* undef
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i8, i8 addrspace(1)* [[TMP]], i64 16
; CHECK-NEXT: [[TMP4:%.*]] = bitcast i8 addrspace(1)* [[TMP3]] to i32 addrspace(1)*
; CHECK-NEXT: [[STATEPOINT_TOKEN:%.*]] = call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 2882400000, i32 0, void ()* elementtype(void ()) @wibble, i32 0, i32 0, i32 0, i32 0) [ "deopt"() ]
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds i32, i32 addrspace(1)* [[TMP4]], i64 undef
; CHECK-NEXT: ret void
;
bb:
%tmp = freeze i8 addrspace(1)* undef
%tmp3 = getelementptr inbounds i8, i8 addrspace(1)* %tmp, i64 16
%tmp4 = bitcast i8 addrspace(1)* %tmp3 to i32 addrspace(1)*
call void @wibble() #3 [ "deopt"() ]
%tmp5 = getelementptr inbounds i32, i32 addrspace(1)* %tmp4, i64 undef
ret void
}
declare i32* @zot()
declare void @wibble()