33da4ce457
For 32 bit equality (Eq32), rather than always zero extending to 64 bits, sign extend for signed types and zero extend for unsigned types. This makes no difference to the equality test (via SUB), however it increases the likelihood of avoiding unnecessary sign or zero extension simply for the purpose of equality testing. While here, replace the Neq* rules with (Not (Eq*)) - this makes no difference to the generated code (as the intermediates get expanded and eliminated), however it means that changes to the equality rules also reflect in the inequality rules. As an example, the following: lw t0,956(t0) slli t0,t0,0x20 srli t0,t0,0x20 li t1,1 bne t1,t0,278fc Becomes: lw t0,1024(t0) li t1,1 bne t1,t0,278b0 Removes almost 1000 instructions from the Go binary on riscv64. Change-Id: Iac60635f494f6db87faa47752bd1cc16e6b5967f Reviewed-on: https://go-review.googlesource.com/c/go/+/516595 Run-TryBot: Joel Sing <joel@sing.id.au> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: M Zhuo <mzh@golangcn.org> Reviewed-by: Michael Knyszek <mknyszek@google.com> |
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The Go Programming Language
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