6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-18 11:24:01 +00:00
Code Issues Projects Releases Wiki Activity

Optimize trivial branches in CodeGenPrepare, which often get created from the

Browse Source 
lowering of objectsize intrinsics. Unfortunately, a number of tests were relying
on llc not optimizing trivial branches, so I had to add an option to allow them
to continue to test what they originally tested.

This fixes <rdar://problem/8785296> and <rdar://problem/9112893>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127459 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cameron Zwarich
2011-03-11 04:54:27 +00:00
parent 4a6d735105
commit 592ca3fda9
16 changed files with 31 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
lib/Transforms/Scalar/CodeGenPrepare.cpp
View File

@ -58,6 +58,10 @@ STATISTIC(NumMemoryInsts, "Number of memory instructions whose address "
STATISTIC(NumExtsMoved, "Number of [s|z]ext instructions combined with loads");
STATISTIC(NumExtUses, "Number of uses of [s|z]ext instructions optimized");
static cl::opt<bool> DisableBranchOpts(
"disable-cgp-branch-opts", cl::Hidden, cl::init(false),
cl::desc("Disable branch optimizations in CodeGenPrepare"));
namespace {
class CodeGenPrepare : public FunctionPass {
/// TLI - Keep a pointer of a TargetLowering to consult for determining
@ -130,6 +134,16 @@ bool CodeGenPrepare::runOnFunction(Function &F) {
SunkAddrs.clear();
if (!DisableBranchOpts) {
MadeChange = false;
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
MadeChange |= ConstantFoldTerminator(BB);
if (MadeChange && DT)
DT->DT->recalculate(F);
EverMadeChange |= MadeChange;
}
return EverMadeChange;
}