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[RegisterBankInfo] Change the semantic of recordRegBankForType.

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Now, recordRegBankForType records only the first register bank that
covers a type instead of the last. This behavior can, nevertheless, be
override with the additional Force parameter to force the update.

llvm-svn: 265741
This commit is contained in:
Quentin Colombet 2016-04-07 23:02:00 +00:00
parent 841beedad7
commit c7b62134f9
1 changed files with 12 additions and 7 deletions
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19
include/llvm/CodeGen/GlobalISel/RegisterBankInfo.h
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@ -196,7 +196,7 @@ protected:
/// be mapped to \p ID. Although this done by default, targets may want to
/// disable it, espicially if a given type may be mapped on different
/// register bank. Indeed, in such case, this method only records the
/// last register bank where the type matches.
/// first register bank where the type matches.
/// This information is only used to provide default mapping
/// (see getInstrMappingImpl).
///
@ -227,18 +227,23 @@ protected:
return VTToRegBank.get()[SVT];
}
/// Add \p SVT to the type that \p RegBank covers.
/// Record \p RegBank as the register bank that covers \p SVT.
/// If a record was already set for \p SVT, the mapping is not
/// updated, unless \p Force == true
///
/// \post If \p SVT was covered by another register bank before that call,
/// then this information is gone.
/// \post getRegBankForType(SVT) == &RegBank
/// \post if getRegBankForType(SVT)@pre == nullptr then
/// getRegBankForType(SVT) == &RegBank
/// \post if Force == true then getRegBankForType(SVT) == &RegBank
void recordRegBankForType(const RegisterBank &RegBank,
MVT::SimpleValueType SVT) {
MVT::SimpleValueType SVT, bool Force = false) {
if (!VTToRegBank)
VTToRegBank.reset(
new const RegisterBank *[MVT::SimpleValueType::LAST_VALUETYPE]);
assert(SVT < MVT::SimpleValueType::LAST_VALUETYPE && "Out-of-bound access");
VTToRegBank.get()[SVT] = &RegBank;
// If we want to override the mapping or the mapping does not exits yet,
// set the register bank for SVT.
if (Force || !getRegBankForType(SVT))
VTToRegBank.get()[SVT] = &RegBank;
}
/// Try to get the mapping of \p MI.