tree 3f221588c3ab7b6013b95c36125015e43d4702db
parent 7a2d408dea60aa1f8d53e123b01277c41b8f83b9
author Arseny Kapoulkine <arseny.kapoulkine@gmail.com> 1580739647 -0800
committer GitHub <noreply@github.com> 1580739647 -0500
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Implement constant folding for many transcendentals (#3166)

* Implement constant folding for many transcendentals

This change adds support for folding of sin/cos/tan/asin/acos/atan,
exp/log/exp2/log2, sqrt, atan2 and pow.

The mechanism allows to use any C function to implement folding in the
future; for now I limited the actual additions to the most commonly used
intrinsics in the shaders.

Unary folder had to be tweaked to work with extended instructions - for
extended instructions, constants.size() == 2 and constants[0] ==
nullptr. This adjustment is similar to the one binary folder already
performs.

Fixes #1390.

* Fix Android build

On old versions of Android NDK, we don't get std::exp2/std::log2
because of partial C++11 support.

We do get ::exp2, but not ::log2 so we need to emulate that.