[PATCH] D60641: [DebugInfo at O2] Prevent Instcombine from dropping debug info when removing zexts (fixes PR41475)
Wolfgang Pieb via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Apr 15 10:40:13 PDT 2019
This revision was automatically updated to reflect the committed changes.
Closed by commit rL358431: [DEBUGINFO] Prevent Instcombine from dropping debuginfo when removing zexts (authored by wolfgangp, committed by ).
Herald added a project: LLVM.
Changed prior to commit:
https://reviews.llvm.org/D60641?vs=194968&id=195226#toc
Repository:
rL LLVM
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D60641/new/
https://reviews.llvm.org/D60641
Files:
llvm/trunk/lib/Transforms/Utils/Local.cpp
llvm/trunk/test/Transforms/InstCombine/cast-mul-select.ll
Index: llvm/trunk/lib/Transforms/Utils/Local.cpp
===================================================================
--- llvm/trunk/lib/Transforms/Utils/Local.cpp
+++ llvm/trunk/lib/Transforms/Utils/Local.cpp
@@ -1666,11 +1666,10 @@
};
if (auto *CI = dyn_cast<CastInst>(&I)) {
- if (!CI->isNoopCast(DL))
- return nullptr;
-
- // No-op casts are irrelevant for debug info.
- return SrcDIExpr;
+ // No-op casts and zexts are irrelevant for debug info.
+ if (CI->isNoopCast(DL) || isa<ZExtInst>(&I))
+ return SrcDIExpr;
+ return nullptr;
} else if (auto *GEP = dyn_cast<GetElementPtrInst>(&I)) {
unsigned BitWidth =
M.getDataLayout().getIndexSizeInBits(GEP->getPointerAddressSpace());
Index: llvm/trunk/test/Transforms/InstCombine/cast-mul-select.ll
===================================================================
--- llvm/trunk/test/Transforms/InstCombine/cast-mul-select.ll
+++ llvm/trunk/test/Transforms/InstCombine/cast-mul-select.ll
@@ -170,3 +170,12 @@
unreachable
}
+; Check that we don't drop debug info when a zext is removed.
+define i1 @foo(i1 zeroext %b) {
+; DBGINFO-LABEL: @foo(
+; DBGINFO-NEXT: call void @llvm.dbg.value(metadata i1 %b
+; DBGINFO-NEXT: ret i1 %b
+
+ %frombool = zext i1 %b to i8
+ ret i1 %b
+}
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