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[WebAssembly] iterate stack in DebugFixup from the top. 

Differential Revision: https://reviews.llvm.org/D80045
This commit is contained in:
Wouter van Oortmerssen 2020-05-15 16:09:20 -07:00
parent 1907f28b47
commit 10e2e7de0c
1 changed files with 2 additions and 3 deletions
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5
llvm/lib/Target/WebAssembly/WebAssemblyDebugFixup.cpp
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@ -86,9 +86,9 @@ bool WebAssemblyDebugFixup::runOnMachineFunction(MachineFunction &MF) {
// Search for register rather than assume it is on top (which it
// typically is if it appears right after the def), since
// DBG_VALUE's may shift under some circumstances.
size_t Depth = 0;
for (auto &Elem : Stack) {
for (auto &Elem : reverse(Stack)) {
if (MO.getReg() == Elem.Reg) {
auto Depth = static_cast<unsigned>(&Elem - &Stack[0]);
LLVM_DEBUG(dbgs() << "Debug Value VReg " << MO.getReg()
<< " -> Stack Relative " << Depth << "\n");
MO.ChangeToTargetIndex(WebAssembly::TI_OPERAND_STACK, Depth);
@ -98,7 +98,6 @@ bool WebAssemblyDebugFixup::runOnMachineFunction(MachineFunction &MF) {
Elem.DebugValue = &MI;
break;
}
Depth++;
}
// If the Reg was not found, we have a DBG_VALUE outside of its
// def-use range, and we leave it unmodified as reg, which means