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The computed value is only used when the register is equal to zero, so we can fully precompute it and materialize the constant instead. In other words, we change from ``` return reg == 0 ? (reg | 1ULL << 63) : reg; ``` to ``` return reg == 0 ? 1ULL << 63 : reg; ``` The number of instructions remains the same, but we eliminate an unnecessary dependency on the register value. Before: 0xb241037a orr x26, x27, #0x8000000000000000 0xeb1f037f cmp x27, xzr 0x9a9a137b csel x27, x27, x26, ne After: 0xd2f0001a mov x26, #-0x8000000000000000 ; =-9223372036854775808 0xeb1f037f cmp x27, xzr 0x9a9a137b csel x27, x27, x26, ne |
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| .. | ||
| Android | ||
| Core | ||
| DSPSpy | ||
| DSPTool | ||
| PCH | ||
| UnitTests | ||
| VSProps | ||
| .clang-format | ||
| CMakeLists.txt | ||
| dolphin-emu.sln | ||