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Replace the statically generated hashtables for checking register relationships with just scanning the (typically tiny) static lists.

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At the time I wrote this code (circa 2007), TargetRegisterInfo was using a std::set to perform these queries.  Switching to the static hashtables was an obvious improvement, but in reality there's no reason to do anything other than scan.
With this change, total LLC time on a whole-program 403.gcc is reduced by approximately 1.5%, almost all of which comes from a 15% reduction in LiveVariables time.  It also reduces the binary size of LLC by 86KB, thanks to eliminating a bunch of very large static tables.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133051 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2011-06-15 06:53:50 +00:00
parent 9100a78bce
commit 1e56a2a85f
3 changed files with 12 additions and 134 deletions
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8
lib/Target/TargetRegisterInfo.cpp
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@@ -23,12 +23,8 @@ using namespace llvm;
TargetRegisterInfo::TargetRegisterInfo(const TargetRegisterDesc *D, unsigned NR,
regclass_iterator RCB, regclass_iterator RCE,
const char *const *subregindexnames,
int CFSO, int CFDO,
const unsigned* subregs, const unsigned subregsize,
const unsigned* aliases, const unsigned aliasessize)
: SubregHash(subregs), SubregHashSize(subregsize),
AliasesHash(aliases), AliasesHashSize(aliasessize),
Desc(D), SubRegIndexNames(subregindexnames), NumRegs(NR),
int CFSO, int CFDO)
: Desc(D), SubRegIndexNames(subregindexnames), NumRegs(NR),
RegClassBegin(RCB), RegClassEnd(RCE) {
assert(isPhysicalRegister(NumRegs) &&
"Target has too many physical registers!");