tree 3d111e32742a48157d445a9df7fb48855604d999
parent 4228bb95b5b56f6b0f9ded5c7910bbe773a4c9d2
author Nicolas Capens <capn@google.com> 1644520430 -0500
committer Nicolas Capens <nicolascapens@google.com> 1645107974 +0000

Fix rr::RoundIntClamped() for architectures other than x86 and ARM

Previously we assumed that non-x86 architectures return clamped results
for out-of-range inputs to casting floating-point numbers to integers.
This is true at least for ARM, but not for RISC-V and possibly others.

An implementation which depends on LLVM's fptosi_sat intrinsic has been
added, which requires a recent version of LLVM. When not available, we
fall back to explicitly clamping both the upper and lower bound.

Bug: b/217573066
Bug: b/165000222
Change-Id: Ia5f1f6de395f52852044c7e1f875c1164b18f09b
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/62728
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>