tree f16413b6db7a349ed75308be8ac57f0a5c3795ea
parent 105fd0f651d167728e79d101d65fbaf988c6e94e
author Stephen White <senorblanco@chromium.org> 1551296354 -0500
committer Stephen White <senorblanco@chromium.org> 1551297805 +0000

Fix push & pop of XMM registers.

Microsoft's x86-64 calling convention ABI requires registers XMM6-15 to
be preserved by the callee:
https://docs.microsoft.com/en-us/cpp/build/x64-calling-convention?view=vs-2017#calling-convention-defaults

Implement a _pop_reg() analog to _push_reg(), so we can specialize
the XMM treatment. Pass the RegNum all the way down to the specialized
class, because we don't know which registers should be 128-bit at the call site.

Bug chromium:931926
Bug swiftshader:22

Change-Id: I57637c852f0f3bb9a374d61a16a7aaa434ac908d
Reviewed-on: https://swiftshader-review.googlesource.com/c/25468
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Stephen White <senorblanco@chromium.org>