https://github.com/shader-slang/slang
Revision b1317cd16ab9c827596a28ccf4258ef1bb672d92 authored by Tim Foley on 09 March 2020, 16:02:36 UTC, committed by GitHub on 09 March 2020, 16:02:36 UTC
The only big catch that I ran into with this batch was that I found the `float.getPi()` function was being emitted to the output GLSL even when that function wasn't being used. This seems to have been a latent problem in the earlier PR, but was only surfaced in the tests once a Slang->GLSL test started using another intrinsic that led to the `float : __BuiltinFloatingPointType` witness table being live in the IR. The fix for the gotcha here was to add a late IR pass that basically empties out all witness tables in the IR, so that functions that are only referenced by witness tables can then be removed as dead code. This pass is something we should *not* apply if/when we start supporting real dynamic dispatch through witness tables, but that is a problem to be solved on another day. The remaining tricky pieces of this change were: * Needed to remember to mark functions as target intrinsics on HLSL and/or GLSL as appropriate (hopefully I caught all the cases) so they don't get emitted as source there. * The `msad4` function in HLSL is very poorly documented, so filling in its definition was tricky. I made my best effort based on how it is described on MSDN, but it is likely that if anybody wants to rely on this function they will need us to vet our results with some tests.
1 parent 4760829
Tip revision: b1317cd16ab9c827596a28ccf4258ef1bb672d92 authored by Tim Foley on 09 March 2020, 16:02:36 UTC
Yet more definitions moved into the stdlib (#1263)
Yet more definitions moved into the stdlib (#1263)
Tip revision: b1317cd
slang.sln
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