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Replace MathFloor/Round by HChange if the input representation does not match the output representation

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R=svenpanne@chromium.org

Review URL: https://chromiumcodereview.appspot.com/22398009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16129 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
verwaest@chromium.org 2013-08-09 12:03:40 +00:00
parent 19659646ca
commit d435819e36
1 changed files with 18 additions and 2 deletions
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20
src/hydrogen-instructions.cc
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@ -1291,7 +1291,15 @@ HValue* HUnaryMathOperation::Canonicalize() {
// If the input is integer32 then we replace the round instruction
// with its input.
if (val->representation().IsSmiOrInteger32()) return val;
if (val->representation().IsSmiOrInteger32()) {
if (!val->representation().Equals(representation())) {
HChange* result = new(block()->zone()) HChange(
val, representation(), false, false, false);
result->InsertBefore(this);
return result;
}
return val;
}
}
if (op() == kMathFloor) {
@ -1300,7 +1308,15 @@ HValue* HUnaryMathOperation::Canonicalize() {
// If the input is integer32 then we replace the floor instruction
// with its input.
if (val->representation().IsSmiOrInteger32()) return val;
if (val->representation().IsSmiOrInteger32()) {
if (!val->representation().Equals(representation())) {
HChange* result = new(block()->zone()) HChange(
val, representation(), false, false, false);
result->InsertBefore(this);
return result;
}
return val;
}
if (val->IsDiv() && (val->UseCount() == 1)) {
HDiv* hdiv = HDiv::cast(val);