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Add option to turn off codegen improvements when mask 'all on' is statically known.

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This commit is contained in:
Matt Pharr
2011-12-11 16:16:36 -08:00
parent 20536bb339
commit 46bfef3fce
7 changed files with 88 additions and 33 deletions
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22
stmt.cpp
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@@ -868,7 +868,9 @@ lSafeToRunWithAllLanesOff(Stmt *stmt) {
void
IfStmt::emitVaryingIf(FunctionEmitContext *ctx, llvm::Value *ltest) const {
llvm::Value *oldMask = ctx->GetInternalMask();
if (ctx->GetFullMask() == LLVMMaskAllOn && !g->opt.disableCoherentControlFlow) {
if (ctx->GetFullMask() == LLVMMaskAllOn &&
!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");
@@ -952,9 +954,11 @@ IfStmt::emitMaskAllOn(FunctionEmitContext *ctx, llvm::Value *ltest,
// code emitted here can operate with the knowledge that the mask is
// definitely all on (until it modifies the mask itself).
assert(!g->opt.disableCoherentControlFlow);
ctx->SetInternalMask(LLVMMaskAllOn);
if (!g->opt.disableMaskAllOnOptimizations)
ctx->SetInternalMask(LLVMMaskAllOn);
llvm::Value *oldFunctionMask = ctx->GetFunctionMask();
ctx->SetFunctionMask(LLVMMaskAllOn);
if (!g->opt.disableMaskAllOnOptimizations)
ctx->SetFunctionMask(LLVMMaskAllOn);
// First, check the value of the test. If it's all on, then we jump to
// a basic block that will only have code for the true case.
@@ -1156,9 +1160,11 @@ void DoStmt::EmitCode(FunctionEmitContext *ctx) const {
// IfStmt::emitCoherentTests()), and then emit the code for the
// loop body.
ctx->SetCurrentBasicBlock(bAllOn);
ctx->SetInternalMask(LLVMMaskAllOn);
if (!g->opt.disableMaskAllOnOptimizations)
ctx->SetInternalMask(LLVMMaskAllOn);
llvm::Value *oldFunctionMask = ctx->GetFunctionMask();
ctx->SetFunctionMask(LLVMMaskAllOn);
if (!g->opt.disableMaskAllOnOptimizations)
ctx->SetFunctionMask(LLVMMaskAllOn);
if (bodyStmts)
bodyStmts->EmitCode(ctx);
assert(ctx->GetCurrentBasicBlock());
@@ -1379,9 +1385,11 @@ ForStmt::EmitCode(FunctionEmitContext *ctx) const {
// the runtime test has passed, make this fact clear for code
// generation at compile time here.)
ctx->SetCurrentBasicBlock(bAllOn);
ctx->SetInternalMask(LLVMMaskAllOn);
if (!g->opt.disableMaskAllOnOptimizations)
ctx->SetInternalMask(LLVMMaskAllOn);
llvm::Value *oldFunctionMask = ctx->GetFunctionMask();
ctx->SetFunctionMask(LLVMMaskAllOn);
if (!g->opt.disableMaskAllOnOptimizations)
ctx->SetFunctionMask(LLVMMaskAllOn);
if (stmts)
stmts->EmitCode(ctx);
assert(ctx->GetCurrentBasicBlock());