maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Shorten instructions if possible. 

Summary:
Generate short versions of branch instructions by default and rely on
relaxation to produce longer versions when needed.

Also produce short versions of arithmetic instructions if immediate
fits into one byte. This was only triggered once on HHVM binary.

(cherry picked from FBD3591466)
This commit is contained in:
Maksim Panchenko 2016-07-19 11:19:18 -07:00
parent 674dbcc0de
commit bf46263eed
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
bolt/BinaryFunction.cpp
View File

@ -480,6 +480,9 @@ bool BinaryFunction::disassemble(ArrayRef<uint8_t> FunctionData) {
break;
}
// Convert instruction to a shorter version that could be relaxed if needed.
MIA->shortenInstruction(Instruction);
if (MIA->isBranch(Instruction) || MIA->isCall(Instruction)) {
uint64_t InstructionTarget = 0;
if (MIA->evaluateBranch(Instruction,