tree 96d1f4f9a475c6a91e0cff3b7b6f57968afec182
parent 6287c18b1d249152563f0cb2d5cb0c6d0eb9e3d6
author Nicolas Capens <capn@google.com> 1598454277 -0400
committer Nicolas Capens <nicolascapens@google.com> 1599067342 +0000

Skip texel address sample offset if zero

The SPIR-V spec states that the Sample operand of OpImageTexelPointer
"must be a valid <id> for the value 0 if the OpTypeImage has MS of 0."

This change optimizes for this common case by no performing texel
address sample offset and bounds check calculations.

Bug: b/163142358
Change-Id: I75932c264d45df1012fa8451fc4c57671191b59b
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/47808
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>