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Unified Diff: src/hydrogen-uint32-analysis.cc

Issue 54393002: Fix uint32-to-smi conversion in Lithium (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: your wish is my command Created 7 years, 2 months ago
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Index: src/hydrogen-uint32-analysis.cc
diff --git a/src/hydrogen-uint32-analysis.cc b/src/hydrogen-uint32-analysis.cc
index 835a198d4d8b53f42d06542806f3381116ea1869..8de887d6f805271aa355f782fddc1987932e3738 100644
--- a/src/hydrogen-uint32-analysis.cc
+++ b/src/hydrogen-uint32-analysis.cc
@@ -35,8 +35,17 @@ bool HUint32AnalysisPhase::IsSafeUint32Use(HValue* val, HValue* use) {
// Operations that operate on bits are safe.
if (use->IsBitwise() || use->IsShl() || use->IsSar() || use->IsShr()) {
return true;
- } else if (use->IsChange() || use->IsSimulate()) {
- // Conversions and deoptimization have special support for unt32.
+ } else if (use->IsSimulate()) {
+ // Deoptimization has special support for uint32.
+ return true;
+ } else if (use->IsChange()) {
+ // Conversions have special support for uint32.
+ // This ASSERT guards that the conversion in question is actually
+ // implemented. Do not extend the whitelist without adding
+ // support to LChunkBuilder::DoChange().
+ ASSERT(HChange::cast(use)->to().IsDouble() ||
+ HChange::cast(use)->to().IsSmi() ||
+ HChange::cast(use)->to().IsTagged());
return true;
} else if (use->IsStoreKeyed()) {
HStoreKeyed* store = HStoreKeyed::cast(use);
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