Reland "[NVPTX] Validate user-specified PTX version against SM version" (#179304) Previous commit message: > Original commit message: > >>When users explicitly specify a PTX version via -mattr=+ptxNN that's insufficient for their target SM, we now emit a fatal error. Previously, we silently upgraded the PTX version to the minimum required for the target SM. >> >>When no SM or PTX version is specified, we now use PTX 3.2 (the minimum for the default SM 3.0) instead of PTX 6.0. > >The following commits should fix the failures that arose when I previously tried to land this commit: > >https://github.com/llvm/llvm-project/commit/9fc5fd0ad689eed94f65b1d6d10f9c5642935e68 should address the llvm-nvptx*-nvidia-* build failures: https://github.com/llvm/llvm-project/pull/174834#issuecomment-3742242651 > >https://github.com/llvm/llvm-project/commit/600514a63760c6730e4cd970d2fcead9c5a897b3 should address the MLIR failures --- The previous commit was reverted with d23cb79ba497281de050ef609cb91b91058bf323 because the [mlir-nvidia](https://lab.llvm.org/buildbot/#/builders/138/builds/24797) and [mlir-nvidia-gcc7](https://lab.llvm.org/buildbot/#/builders/116/builds/23929) Buildbots were failing. Those tests failed because MLIR's default SM was 5.0, which caused NVPTX to target PTX ISA v4.0, which did not support the intrinsics used in the failing tests. 243f011577193c99358ccc4142b296d4fa80ea11 should address this by bumping MLIR's default SM to 7.5. Now, using MLIR's new default SM, NVPTX targets the PTX ISA v6.3, which supports the intrinsics used in the failing tests. GitOrigin-RevId: ca93dd399eec6436bebe4c6d727ff6af0ab7b7d4
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