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f20944de78
For address of an auto or arg, on all non-x86 architectures the assembler backend encodes the actual SP offset in the instruction but leaves the offset in Prog unchanged. When the assembly is printed in compile -S, it shows an offset relative to pseudo FP/SP with an actual hardware SP base register (e.g. R13 on ARM). This is confusing. Unset the base register if it is indeed SP, so the assembly output is consistent. If the base register isn't SP, it should be an error and the error output contains the actual base register. For address loading instructions, the base register isn't set in the compiler on non-x86 architectures. Set it. Normally it is SP and will be unset in the change mentioned above for printing. If it is not, it will be an error and the error output contains the actual base register. No change in generated binary, only printed assembly. Passes "go build -a -toolexec 'toolstash -cmp' std cmd" on all architectures. Fixes #21064. Change-Id: Ifafe8d5f9b437efbe824b63b3cbc2f5f6cdc1fd5 Reviewed-on: https://go-review.googlesource.com/49432 Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com> |
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