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Revert "[Salvage] Change salvage debug info implementation to use DW_OP_LLVM_convert where needed"

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This reverts r360772 due to build issues.
Reverted commit: 17dd4d7403770bd683675e45f5517e0cdb8f9b2b.

llvm-svn: 360773
This commit is contained in:
Stephen Tozer 2019-05-15 13:41:44 +00:00
parent f7c6c7c8aa
commit da241d67bf
3 changed files with 2 additions and 48 deletions
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23
lib/Transforms/Utils/Local.cpp
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@ -1690,27 +1690,8 @@ DIExpression *llvm::salvageDebugInfoImpl(Instruction &I,
// No-op casts and zexts are irrelevant for debug info.
if (CI->isNoopCast(DL) || isa<ZExtInst>(&I))
return SrcDIExpr;
Type *Type = CI->getType();
// Casts other than Trunc or SExt to scalar types cannot be salvaged.
if (Type->isVectorTy() || (!isa<TruncInst>(&I) && !isa<SExtInst>(&I)))
return nullptr;
Value *FromValue = CI->getOperand(0);
unsigned FromTypeBitSize = FromValue->getType()->getScalarSizeInBits();
unsigned ToTypeBitSize = Type->getScalarSizeInBits();
// The result of the cast will be sign extended iff the instruction is a
// SExt; signedness is otherwise irrelevant on the expression stack.
unsigned Encoding =
isa<SExtInst>(&I) ? dwarf::DW_ATE_signed : dwarf::DW_ATE_unsigned;
return applyOps({dwarf::DW_OP_LLVM_convert, FromTypeBitSize, Encoding,
dwarf::DW_OP_LLVM_convert, ToTypeBitSize, Encoding});
}
if (auto *GEP = dyn_cast<GetElementPtrInst>(&I)) {
return nullptr;
} else if (auto *GEP = dyn_cast<GetElementPtrInst>(&I)) {
unsigned BitWidth =
M.getDataLayout().getIndexSizeInBits(GEP->getPointerAddressSpace());
// Rewrite a constant GEP into a DIExpression.

25
test/DebugInfo/salvage-cast-debug-info.ll
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@ -1,25 +0,0 @@
; RUN: opt %s -debugify -early-cse -S | FileCheck %s
define i32 @foo(i64 %nose, i32 %more) {
; CHECK-LABEL: @foo(
; CHECK: call void @llvm.dbg.value(metadata i64 %nose, metadata [[V1:![0-9]+]], metadata !DIExpression(DW_OP_LLVM_convert, 64, DW_ATE_unsigned, DW_OP_LLVM_convert, 32, DW_ATE_unsigned
; CHECK: call void @llvm.dbg.value(metadata i64 %nose.shift, metadata [[V2:![0-9]+]]
; CHECK: call void @llvm.dbg.value(metadata i64 %nose.shift, metadata [[V3:![0-9]+]], metadata !DIExpression(DW_OP_LLVM_convert, 64, DW_ATE_unsigned, DW_OP_LLVM_convert, 32, DW_ATE_unsigned
entry:
%nose.trunc = trunc i64 %nose to i32
%nose.shift = lshr i64 %nose, 32
%nose.trunc.2 = trunc i64 %nose.shift to i32
%add = add nsw i32 %more, 1
ret i32 %add
}
!llvm.module.flags = !{!0, !1}
!llvm.ident = !{!2}
!0 = !{i32 1, !"wchar_size", i32 2}
!1 = !{i32 7, !"PIC Level", i32 2}
!2 = !{!"clang version 9.0.0 "}
; CHECK: [[V1]] = !DILocalVariable(
; CHECK: [[V2]] = !DILocalVariable(
; CHECK: [[V3]] = !DILocalVariable(

2
test/Transforms/InstCombine/cast-mul-select.ll
View File

@ -13,8 +13,6 @@ define i32 @mul(i32 %x, i32 %y) {
; we preserve the debug information in the resulting
; instruction.
; DBGINFO-LABEL: @mul(
; DBGINFO-NEXT: call void @llvm.dbg.value(metadata i32 %x
; DBGINFO-NEXT: call void @llvm.dbg.value(metadata i32 %y
; DBGINFO-NEXT: [[C:%.*]] = mul i32 {{.*}}
; DBGINFO-NEXT: [[D:%.*]] = and i32 {{.*}}
; DBGINFO-NEXT: call void @llvm.dbg.value(metadata i32 [[C]]