- Add support for `@llvm.exp2()`:
- LLVM: `float` -> PTX: `ex2.approx{.ftz}.f32`
- LLVM: `half` -> PTX: `ex2.approx.f16`
- LLVM: `<2 x half>` -> PTX: `ex2.approx.f16x2`
- LLVM: `bfloat` -> PTX: `ex2.approx.ftz.bf16`
- LLVM: `<2 x bfloat>` -> PTX: `ex2.approx.ftz.bf16x2`
- Any operations with non-native vector widths are expanded. On
targets not supporting f16/bf16, values are promoted to f32.
- Add *CONDITIONAL* support for `@llvm.log2()` [^1]:
- LLVM: `float` -> PTX: `lg2.approx{.ftz}.f32`
- Support for f16/bf16 is emulated by promoting values to f32.
[1]: CUDA implements `exp2()` with `ex2.approx` but `log2()` is
implemented differently, so this is off by default. To enable, use the
flag `-nvptx-approx-log2f32`.
3ba339b5e7