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Add foreach_unique iteration construct.

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Idea via Ingo Wald / IVL compiler.
This commit is contained in:
Matt Pharr
2012-06-20 10:03:44 -07:00
parent fae47e0dfc
commit 3bc66136b2
17 changed files with 488 additions and 6 deletions
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12
ast.cpp
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@@ -92,6 +92,7 @@ WalkAST(ASTNode *node, ASTPreCallBackFunc preFunc, ASTPostCallBackFunc postFunc,
DoStmt *dos;
ForStmt *fs;
ForeachStmt *fes;
ForeachUniqueStmt *fus;
CaseStmt *cs;
DefaultStmt *defs;
SwitchStmt *ss;
@@ -137,6 +138,10 @@ WalkAST(ASTNode *node, ASTPreCallBackFunc preFunc, ASTPostCallBackFunc postFunc,
postFunc, data);
fes->stmts = (Stmt *)WalkAST(fes->stmts, preFunc, postFunc, data);
}
else if ((fus = dynamic_cast<ForeachUniqueStmt *>(node)) != NULL) {
fus->expr = (Expr *)WalkAST(fus->expr, preFunc, postFunc, data);
fus->stmts = (Stmt *)WalkAST(fus->stmts, preFunc, postFunc, data);
}
else if ((cs = dynamic_cast<CaseStmt *>(node)) != NULL)
cs->stmts = (Stmt *)WalkAST(cs->stmts, preFunc, postFunc, data);
else if ((defs = dynamic_cast<DefaultStmt *>(node)) != NULL)
@@ -385,12 +390,17 @@ lCheckAllOffSafety(ASTNode *node, void *data) {
return false;
}
if (dynamic_cast<ForeachStmt *>(node) != NULL) {
if (dynamic_cast<ForeachStmt *>(node) != NULL ||
dynamic_cast<ForeachUniqueStmt *>(node) != NULL) {
// foreach() statements also shouldn't be run with an all-off mask.
// Since they re-establish an 'all on' mask, this would be pretty
// unintuitive. (More generally, it's possibly a little strange to
// allow foreach() in the presence of any non-uniform control
// flow...)
//
// Similarly, the implementation foreach_unique assumes as a
// precondition that the mask won't be all off going into it, so
// we'll enforce that here...
*okPtr = false;
return false;
}