[HLSL] Implement the `faceforward` intrinsic#135878

Merged

kmpeng merged 6 commits intollvm:mainfrom

kmpeng:faceforward-intrinsic

Apr 24, 2025

Commits on Apr 24, 2025

create int_spv_faceforward intrinsic, create faceforward lowering & map to int_spv_faceforward, create SPIR-V backend test case
kmpeng
committed
implemented `faceforward` in `hlsl.Intrinsics.h` and its spir-v target built-in, added codegen and sema tests
kmpeng
committed
address PR comments - move repeated code to helper function, remove -x specification in tests, clarify faceforward desc
kmpeng
committed
address PR comments - removed faceforward_vec_impl, only check first arg is float in sema spirv checks, add half tests to codegen spirv test
kmpeng
committed
Change target env to spv1.4 and add FIXME comment
kmpeng
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fix spirv tests
kmpeng
committed