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Add initial support for 'goto' statements.

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ispc now supports goto, but only under uniform control flow--i.e.
it must be possible for the compiler to statically determine that
all program instances will follow the goto.  An error is issued at
compile time if a goto is used when this is not the case.
This commit is contained in:
Matt Pharr
2012-01-05 12:20:44 -08:00
parent 48e9d4af39
commit 78c6d3c02f
20 changed files with 408 additions and 15 deletions
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13
func.cpp
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@@ -290,8 +290,10 @@ Function::emitCode(FunctionEmitContext *ctx, llvm::Function *function,
llvm::BasicBlock *bbAllOn = ctx->CreateBasicBlock("all_on");
llvm::BasicBlock *bbNotAll = ctx->CreateBasicBlock("not_all_on");
ctx->BranchInst(bbAllOn, bbNotAll, allOn);
// Set up basic blocks for goto targets
ctx->InitializeLabelMap(code);
ctx->BranchInst(bbAllOn, bbNotAll, allOn);
// all on: we've determined dynamically that the mask is all
// on. Set the current mask to "all on" explicitly so that
// codegen for this path can be improved with this knowledge in
@@ -322,12 +324,19 @@ Function::emitCode(FunctionEmitContext *ctx, llvm::Function *function,
// above
ctx->SetCurrentBasicBlock(bbSomeOn);
ctx->SetFunctionMask(mask);
// Set up basic blocks for goto targets again; we want to have
// one set of them for gotos in the 'all on' case, and a
// distinct set for the 'mixed mask' case.
ctx->InitializeLabelMap(code);
code->EmitCode(ctx);
if (ctx->GetCurrentBasicBlock())
ctx->ReturnInst();
}
else
// Set up basic blocks for goto targets
ctx->InitializeLabelMap(code);
// No check, just emit the code
code->EmitCode(ctx);
}