tree ec3d4150f5f692c9250ecdfe9ec97ea3c7b488b6
parent b57a3aaee927a7412dffffac064d833e1d87dc7d
author Nicolas Capens <capn@google.com> 1641420260 -0500
committer Nicolas Capens <nicolascapens@google.com> 1641827172 +0000

Optimize mirror addressing mode

The previous implementation required a total of 8 instructions. The new
version only takes 6.

Note that the previously used Frac() function includes a Min() operation
which ensures that it never returns results greater or equal to 1.0. It
also handles Inf values. The new mirror addressing implementation has an
explicit Min() which serves similar purposes.

Bug: b/194635449
Change-Id: I3f16beb0ecd93e5bafccacd7b5823710c6ace55e
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/61168
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>