• Lynn Boger's avatar
    cmd/compile: generate load without DS relocation for go.string on ppc64le · 30311e88
    Lynn Boger authored
    Due to some recent optimizations related to the compare
    instruction, DS-form load instructions started to be used
    to load 8-byte go.strings. This can cause link time errors
    if the go.string is not aligned to 4 bytes.
    
    For DS-form instructions, the value in the offset field must
    be a multiple of 4. If the offset is known at the time the
    rules are processed, a DS-form load will not be chosen. But for
    go.strings, the offset is not known at that time, but a
    relocation is generated indicating that the linker should fill
    in the DS relocation. When the linker tries to fill in the
    relocation, if the offset is not aligned properly, a link error
    will occur.
    
    To fix this, when loading a go.string using MOVDload, the full
    address of the go.string is generated and loaded into the base
    register. Then the go.string is loaded with a 0 offset field.
    
    Added a testcase that reproduces this problem.
    
    Fixes #24799
    
    Change-Id: I6a154e8e1cba64eae290be0fbcb608b75884ecdd
    Reviewed-on: https://go-review.googlesource.com/107855
    Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: 's avatarDavid Chase <drchase@google.com>
    30311e88
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