43 lines
1.9 KiB
Diff
43 lines
1.9 KiB
Diff
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diff --git a/js/src/jit/riscv64/CodeGenerator-riscv64.cpp b/js/src/jit/riscv64/CodeGenerator-riscv64.cpp
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--- a/js/src/jit/riscv64/CodeGenerator-riscv64.cpp
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+++ b/js/src/jit/riscv64/CodeGenerator-riscv64.cpp
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@@ -1103,22 +1103,29 @@
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masm.xor64(ToRegister64(lhs), ToRegister64(lhs));
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return;
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case 1:
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// nop
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return;
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+ case 2:
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+ masm.add(output.reg, ToRegister64(lhs).reg, ToRegister64(lhs).reg);
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+ return;
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default:
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if (constant > 0) {
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- if (mozilla::IsPowerOfTwo(static_cast<uint32_t>(constant + 1))) {
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- masm.move64(ToRegister64(lhs), output);
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- masm.lshift64(Imm32(FloorLog2(constant + 1)), output);
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- masm.sub64(ToRegister64(lhs), output);
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+ if (mozilla::IsPowerOfTwo(static_cast<uint64_t>(constant + 1))) {
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+ ScratchRegisterScope scratch(masm);
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+ masm.movePtr(ToRegister64(lhs).reg, scratch);
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+ masm.slli(output.reg, ToRegister64(lhs).reg,
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+ FloorLog2(constant + 1));
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+ masm.sub64(scratch, output);
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return;
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} else if (mozilla::IsPowerOfTwo(
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- static_cast<uint32_t>(constant - 1))) {
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- masm.move64(ToRegister64(lhs), output);
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- masm.lshift64(Imm32(FloorLog2(constant - 1u)), output);
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- masm.add64(ToRegister64(lhs), output);
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+ static_cast<uint64_t>(constant - 1))) {
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+ int32_t shift = mozilla::FloorLog2(constant - 1);
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+ ScratchRegisterScope scratch(masm);
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+ masm.movePtr(ToRegister64(lhs).reg, scratch);
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+ masm.slli(output.reg, ToRegister64(lhs).reg, shift);
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+ masm.add64(scratch, output);
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return;
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}
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// Use shift if constant is power of 2.
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int32_t shift = mozilla::FloorLog2(constant);
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if (int64_t(1) << shift == constant) {
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