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cb767247ca
Instead of making asmcgocall call asmcgocall_errno, make both load args into registers and call a shared assembly function. On amd64, this costs 1 word in the asmcgocall_errno path but saves 3 words in the asmcgocall path, and the latter is what happens on critical nosplit paths on Windows. On arm, this fixes build failures: asmcgocall was writing the arguments for asmcgocall_errno into the wrong place on the stack. Passing them in registers avoids the decision entirely. On 386, this isn't really needed, since the nosplit paths have twice as many words to work with, but do it for consistency. Update #8635 Fixes arm build (except GOARM=5). TBR=iant CC=golang-codereviews https://golang.org/cl/134390043 |
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