aaron/ispc
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Remove various equality checks between GetInternalMask() and LLVMMaskAllOn

Browse Source 
These were never kicking in, since GetInternalMask() always loads from the
mask storage memory.
This commit is contained in:
Matt Pharr
2012-06-06 10:02:04 -07:00
parent 967bfa9c92
commit 7b6bd90903
2 changed files with 5 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
ctx.cpp
View File

@@ -381,11 +381,6 @@ FunctionEmitContext::GetInternalMask() {
llvm::Value * llvm::Value *
FunctionEmitContext::GetFullMask() { FunctionEmitContext::GetFullMask() {
llvm::Value *internalMask = GetInternalMask();
if (internalMask == LLVMMaskAllOn && functionMaskValue == LLVMMaskAllOn &&
!g->opt.disableMaskAllOnOptimizations)
return LLVMMaskAllOn;
else
return BinaryOperator(llvm::Instruction::And, GetInternalMask(), return BinaryOperator(llvm::Instruction::And, GetInternalMask(),
functionMaskValue, "internal_mask&function_mask"); functionMaskValue, "internal_mask&function_mask");
} }
@@ -673,9 +668,7 @@ FunctionEmitContext::Break(bool doCoherenceCheck) {
// If all of the enclosing 'if' tests in the loop have uniform control // If all of the enclosing 'if' tests in the loop have uniform control
// flow or if we can tell that the mask is all on, then we can just // flow or if we can tell that the mask is all on, then we can just
// jump to the break location. // jump to the break location.
if (inSwitchStatement() == false && if (inSwitchStatement() == false && ifsInCFAllUniform(CFInfo::Loop)) {
(ifsInCFAllUniform(CFInfo::Loop) ||
GetInternalMask() == LLVMMaskAllOn)) {
BranchInst(breakTarget); BranchInst(breakTarget);
if (ifsInCFAllUniform(CFInfo::Loop) && doCoherenceCheck) if (ifsInCFAllUniform(CFInfo::Loop) && doCoherenceCheck)
Warning(currentPos, "Coherent break statement not necessary in " Warning(currentPos, "Coherent break statement not necessary in "
@@ -730,7 +723,7 @@ FunctionEmitContext::Continue(bool doCoherenceCheck) {
} }
AssertPos(currentPos, controlFlowInfo.size() > 0); AssertPos(currentPos, controlFlowInfo.size() > 0);
if (ifsInCFAllUniform(CFInfo::Loop) || GetInternalMask() == LLVMMaskAllOn) { if (ifsInCFAllUniform(CFInfo::Loop)) {
// Similarly to 'break' statements, we can immediately jump to the // Similarly to 'break' statements, we can immediately jump to the
// continue target if we're only in 'uniform' control flow within // continue target if we're only in 'uniform' control flow within
// loop or if we can tell that the mask is all on. // loop or if we can tell that the mask is all on.

11
stmt.cpp
View File

@@ -494,16 +494,7 @@ IfStmt::emitMaskedTrueAndFalse(FunctionEmitContext *ctx, llvm::Value *oldMask,
void void
IfStmt::emitVaryingIf(FunctionEmitContext *ctx, llvm::Value *ltest) const { IfStmt::emitVaryingIf(FunctionEmitContext *ctx, llvm::Value *ltest) const {
llvm::Value *oldMask = ctx->GetInternalMask(); llvm::Value *oldMask = ctx->GetInternalMask();
if (ctx->GetFullMask() == LLVMMaskAllOn && if (doAllCheck) {
!g->opt.disableCoherentControlFlow &&
!g->opt.disableMaskAllOnOptimizations) {
// We can tell that the mask is on statically at compile time; just
// emit code for the 'if test with the mask all on' path
llvm::BasicBlock *bDone = ctx->CreateBasicBlock("cif_done");
emitMaskAllOn(ctx, ltest, bDone);
ctx->SetCurrentBasicBlock(bDone);
}
else if (doAllCheck) {
// We can't tell if the mask going into the if is all on at the // We can't tell if the mask going into the if is all on at the
// compile time. Emit code to check for this and then either run // compile time. Emit code to check for this and then either run
// the code for the 'all on' or the 'mixed' case depending on the // the code for the 'all on' or the 'mixed' case depending on the