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[RegisterBankInfo] Fix the initialization of the map VT to RegBank.

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Prior to this patch we could have read uninitialized memory.

llvm-svn: 270303
This commit is contained in:
Quentin Colombet 2016-05-21 01:41:17 +00:00
parent d7d0f71629
commit a48386a2aa
1 changed files with 4 additions and 1 deletions
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5
include/llvm/CodeGen/GlobalISel/RegisterBankInfo.h
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@ -272,9 +272,12 @@ protected:
/// \post if Force == true then getRegBankForType(SVT) == &RegBank /// \post if Force == true then getRegBankForType(SVT) == &RegBank
void recordRegBankForType(const RegisterBank &RegBank, void recordRegBankForType(const RegisterBank &RegBank,
MVT::SimpleValueType SVT, bool Force = false) { MVT::SimpleValueType SVT, bool Force = false) {
if (!VTToRegBank) if (!VTToRegBank) {
VTToRegBank.reset( VTToRegBank.reset(
new const RegisterBank *[MVT::SimpleValueType::LAST_VALUETYPE]); new const RegisterBank *[MVT::SimpleValueType::LAST_VALUETYPE]);
std::fill(&VTToRegBank[0],
&VTToRegBank[MVT::SimpleValueType::LAST_VALUETYPE], nullptr);
}
assert(SVT < MVT::SimpleValueType::LAST_VALUETYPE && "Out-of-bound access"); assert(SVT < MVT::SimpleValueType::LAST_VALUETYPE && "Out-of-bound access");
// If we want to override the mapping or the mapping does not exits yet, // If we want to override the mapping or the mapping does not exits yet,
// set the register bank for SVT. // set the register bank for SVT.