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[WebAssembly] Fix fixBrTableIndex removing instruction without checking uses 

Fixes: https://bugs.llvm.org/show_bug.cgi?id=52352
Differential Revision: https://reviews.llvm.org/D113230
This commit is contained in:
Wouter van Oortmerssen 2021-11-04 17:21:00 -07:00
parent 1297c21406
commit 4a0c89a6cf
1 changed files with 6 additions and 2 deletions
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8
llvm/lib/Target/WebAssembly/WebAssemblyFixBrTableDefaults.cpp
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@ -61,9 +61,13 @@ void fixBrTableIndex(MachineInstr &MI, MachineBasicBlock *MBB,
auto ExtMI = MF.getRegInfo().getVRegDef(MI.getOperand(0).getReg());
if (ExtMI->getOpcode() == WebAssembly::I64_EXTEND_U_I32) {
// Unnecessarily extending a 32-bit value to 64, remove it.
assert(MI.getOperand(0).getReg() == ExtMI->getOperand(0).getReg());
auto ExtDefReg = ExtMI->getOperand(0).getReg();
assert(MI.getOperand(0).getReg() == ExtDefReg);
MI.getOperand(0).setReg(ExtMI->getOperand(1).getReg());
ExtMI->eraseFromParent();
if (MF.getRegInfo().use_nodbg_empty(ExtDefReg)) {
// No more users of extend, delete it.
ExtMI->eraseFromParent();
}
} else {
// Incoming 64-bit value that needs to be truncated.
Register Reg32 =