tor-browser

commit 0bccc18ab3e52a71db292af7f2ed045ffe113bfd
parent bd5d1fccbe09f332b8cd9a8cbbbda61fa6c48377
Author: André Bargull <andre.bargull@gmail.com>
Date:   Fri, 24 Oct 2025 14:58:56 +0000

Bug 1996090 - Part 1: Use at-start allocations for LModPowTwoI on riscv64. r=spidermonkey-reviewers,jandem

Differential Revision: https://phabricator.services.mozilla.com/D269848

Diffstat:
M
js/src/jit/riscv64/CodeGenerator-riscv64.cpp
 | 
10
++++------
M
js/src/jit/riscv64/Lowering-riscv64.cpp
 | 
2
+-

2 files changed, 5 insertions(+), 7 deletions(-)
diff --git a/js/src/jit/riscv64/CodeGenerator-riscv64.cpp b/js/src/jit/riscv64/CodeGenerator-riscv64.cpp
@@ -1184,22 +1184,20 @@ void CodeGenerator::visitModPowTwoI(LModPowTwoI* ins) {
   MMod* mir = ins->mir();
   Label negative, done;
 
-  masm.move32(in, out);
-  masm.ma_b(in, in, &done, Assembler::Zero, ShortJump);
   // Switch based on sign of the lhs.
   // Positive numbers are just a bitmask
   masm.ma_b(in, in, &negative, Assembler::Signed, ShortJump);
   {
-    masm.and32(Imm32((1 << ins->shift()) - 1), out);
+    masm.ma_and(out, in, Imm32((1 << ins->shift()) - 1));
     masm.ma_branch(&done, ShortJump);
   }
 
   // Negative numbers need a negate, bitmask, negate
   {
     masm.bind(&negative);
-    masm.neg32(out);
-    masm.and32(Imm32((1 << ins->shift()) - 1), out);
-    masm.neg32(out);
+    masm.negw(out, in);
+    masm.ma_and(out, out, Imm32((1 << ins->shift()) - 1));
+    masm.negw(out, out);
   }
   if (mir->canBeNegativeDividend()) {
     if (!mir->isTruncated()) {
diff --git a/js/src/jit/riscv64/Lowering-riscv64.cpp b/js/src/jit/riscv64/Lowering-riscv64.cpp
@@ -226,7 +226,7 @@ void LIRGeneratorRiscv64::lowerModI(MMod* mod) {
     int32_t shift = FloorLog2(rhs);
     if (rhs > 0 && 1 << shift == rhs) {
       LModPowTwoI* lir =
-          new (alloc()) LModPowTwoI(useRegister(mod->lhs()), shift);
+          new (alloc()) LModPowTwoI(useRegisterAtStart(mod->lhs()), shift);
       if (mod->fallible()) {
         assignSnapshot(lir, mod->bailoutKind());
       }