Files
rust/tests/codegen-llvm
Jonathan Brouwer 66a00ba2ef Rollup merge of #153995 - Flakebi:gpu-use-convergent, r=nnethercote
Use convergent attribute to funcs for GPU targets

On targets with convergent operations, we need to add the convergent attribute to all functions that run convergent operations. Following clang, we can conservatively apply the attribute to all functions when compiling for such a target and rely on LLVM optimizing away the attribute in cases where it is not necessary.

This affects the amdgpu and nvptx targets.

cc @kjetilkjeka, @kulst for nvptx
cc @ZuseZ4

r? @nnethercote, as you already reviewed this in the other PR

Split out from rust-lang/rust#149637, the part here should be uncontroversial.
2026-04-08 14:21:57 +02:00
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The files here use the LLVM FileCheck framework, documented at https://llvm.org/docs/CommandGuide/FileCheck.html.

One extension worth noting is the use of revisions as custom prefixes for FileCheck. If your codegen test has different behavior based on the chosen target or different compiler flags that you want to exercise, you can use a revisions annotation, like so:

// revisions: aaa bbb
// [bbb] compile-flags: --flags-for-bbb

After specifying those variations, you can write different expected, or explicitly unexpected output by using <prefix>-SAME: and <prefix>-NOT:, like so:

// CHECK: expected code
// aaa-SAME: emitted-only-for-aaa
// aaa-NOT:                        emitted-only-for-bbb
// bbb-NOT:  emitted-only-for-aaa
// bbb-SAME:                       emitted-only-for-bbb