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DebugInfo: Don't lose unreferenced non-trivial by-value parameters

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A FastISel optimization was causing us to emit no information for such
parameters & when they go missing we end up emitting a different
function type. By avoiding that shortcut we not only get types correct
(very important) but also location information (handy) - even if it's
only live at the start of a function & may be clobbered later.

Reviewed/discussion by Evan Cheng & Dan Gohman.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184604 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie
2013-06-21 22:56:30 +00:00
parent b37e50b660
commit 1948910e31
5 changed files with 76 additions and 11 deletions
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2
lib/Target/X86/X86FastISel.cpp
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@@ -1732,8 +1732,6 @@ bool X86FastISel::FastLowerArguments() {
const TargetRegisterClass *RC64 = TLI.getRegClassFor(MVT::i64);
for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
I != E; ++I, ++Idx) {
if (I->use_empty())
continue;
bool is32Bit = TLI.getValueType(I->getType()) == MVT::i32;
const TargetRegisterClass *RC = is32Bit ? RC32 : RC64;
unsigned SrcReg = is32Bit ? GPR32ArgRegs[Idx] : GPR64ArgRegs[Idx];