cmd/compile: optimize loads from readonly globals into constants Instead of MOVB go.string."foo"(SB), AX do MOVB $102, AX When we know the global we're loading from is readonly, we can do that read at compile time. I've made this arch-dependent mostly because the cases where this happens often are memory->memory moves, and those don't get decomposed until lowering. Did amd64/386/arm/arm64. Other architectures could follow. Update #26498 Change-Id: I41b1dc831b2cd0a52dac9b97f4f4457888a46389 Reviewed-on: https://go-review.googlesource.com/c/141118 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
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