Files
rust/tests/codegen-llvm
bors 8da2d28cbd Auto merge of #142531 - ohadravid:better-storage-calls-copy-prop, r=tmiasko,cjgillot,saethlin
Remove fewer Storage calls in CopyProp and GVN



Modify the CopyProp and GVN MIR optimization passes to remove fewer `Storage{Live,Dead}` calls, allowing for better optimizations by LLVM - see rust-lang/rust#141649.

### Details

The idea is to use a new `MaybeUninitializedLocals` analysis and remove only the storage calls of locals that are maybe-uninit when accessed in a new location.
2026-04-18 09:16:07 +00:00
..
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2026-02-24 08:33:15 +00:00
2026-03-31 09:06:31 +02:00

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