4a0e84a1be
When we're compiling a resultInArg0 op, we need to clobber the register containing the input value. So we first make a register copy of the input value. We can then clobber either of the two registers the value is in and still have the original input value in a register for future uses. Before this CL, we always clobbered the original, not the copy. But that's not always the right decision - if the original is already in a specific register that it needs to be in later (typically, a return value register), clobber the copy instead. This optimization can remove a mov instruction. It saves 1376 bytes of instructions in cmd/go. Redo of CL 460656, reverted at CL 463475, with a fix for s390x. The new code just ensures that the copied value is in a register which is a valid input register for the instruction. Change-Id: Id570b8a60a6d2da9090de80a90b6bb0266e9e38a Reviewed-on: https://go-review.googlesource.com/c/go/+/463221 Auto-Submit: Keith Randall <khr@golang.org> Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> |
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README.md
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