tor-browser

commit b8f574e58bd7f677851c8d2dba9b15ef5371c331
parent 0d38313cbfba7a0521b91fcca779eca3e228cf75
Author: Rong "Mantle" Bao <webmaster@csmantle.top>
Date:   Wed, 15 Oct 2025 16:39:53 +0000

Bug 1984472 - Part 1: Skip saving live registers when OOL-calling from a call instruction. r=spidermonkey-reviewers,jandem

This prepares oolCallVM for later parts in the stack.

Differential Revision: https://phabricator.services.mozilla.com/D268308

Diffstat:
M
js/src/jit/CodeGenerator.cpp
 | 
8
++++++--

1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/js/src/jit/CodeGenerator.cpp b/js/src/jit/CodeGenerator.cpp
@@ -554,11 +554,15 @@ void CodeGenerator::visitOutOfLineCallVM(
   JitSpewFin(JitSpew_Codegen);
 #endif
   perfSpewer().recordInstruction(masm, lir);
-  saveLive(lir);
+  if (!lir->isCall()) {
+    saveLive(lir);
+  }
   ool->args().generate(this);
   callVM<Fn, fn>(lir);
   ool->out().generate(this);
-  restoreLiveIgnore(lir, ool->out().clobbered());
+  if (!lir->isCall()) {
+    restoreLiveIgnore(lir, ool->out().clobbered());
+  }
   masm.jump(ool->rejoin());
 }