| commit | 5681859e308283628da481c0ddc09a39345b3d46 | [log] [tgz] |
|---|---|---|
| author | Sameer Sahasrabuddhe <sameer.sahasrabuddhe@amd.com> | Tue Apr 15 18:00:01 2025 +0530 |
| committer | Sameer Sahasrabuddhe <sameer.sahasrabuddhe@amd.com> | Fri Apr 18 12:26:21 2025 +0530 |
| tree | ba0c37590c1ac3026adaf1ef43484d12097892b4 | |
| parent | 4ddf344b77cc01282571c643d621af34e6a7d8ad [diff] |
[clang] Redefine `noconvergent` and generate convergence control tokens This introduces the `-fconvergence-control` flag that emits convergence control intrinsics which are then used as the `convergencectrl` operand bundle on convergent calls. This also redefines the `noconvergent` attribute in Clang. The existing simple interpretation is that if a statement is marked `noconvergent`, then every asm call is treated as a non-convergent operation in the emitted LLVM IR. The new semantics introduces a more powerful notion that a `noconvergent` statement may contain convergent operations, but the resulting convergence constraints are limited to the scope of that statement. As a whole the statement itself does not place any convergence constraints on the control flow reaching it. When emitting convergence tokens, this attribute results in a call to the `anchor` intrinsic that determines convergence within the statement.
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