tree 77f20c7d94603a206486c823ec1926e25f8da511
parent 4b34ee3de53138c7d924d6b0c3a36c2a3ebf4bfa
author Antonio Maiorano <amaiorano@google.com> 1582744989 -0500
committer Antonio Maiorano <amaiorano@google.com> 1582820420 +0000

Subzero: add support for variadic calls (System V)

For the System V ABI, variadic calls must store the number of floating
point arguments into RAX. This was mostly working by accident for
our calls to printf since RAX is used as a scratch register, and was
often non-zero, which is all that's really needed for printf with float
args to work; however, when RAX would become 0, printf would print the
wrong thing.

Bug: b/149913889
Change-Id: Id4b519c5416927d537fca078109c0dc850f08359
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41668
Tested-by: Antonio Maiorano <amaiorano@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>