diff options
| -rw-r--r-- | chromium/v8/src/compiler/x64/instruction-selector-x64.cc | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/chromium/v8/src/compiler/x64/instruction-selector-x64.cc b/chromium/v8/src/compiler/x64/instruction-selector-x64.cc index b3dfb91991f..b9495417d54 100644 --- a/chromium/v8/src/compiler/x64/instruction-selector-x64.cc +++ b/chromium/v8/src/compiler/x64/instruction-selector-x64.cc @@ -1116,7 +1116,9 @@ void InstructionSelector::VisitChangeInt32ToInt64(Node* node) { opcode = load_rep.IsSigned() ? kX64Movsxwq : kX64Movzxwq; break; case MachineRepresentation::kWord32: - opcode = load_rep.IsSigned() ? kX64Movsxlq : kX64Movl; + // ChangeInt32ToInt64 must interpret its input as a _signed_ 32-bit + // integer, so here we must sign-extend the loaded value in any case. + opcode = kX64Movsxlq; break; default: UNREACHABLE(); |