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Auto merge of #106660 - saethlin:destprop-move-codegen, r=tmiasko

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Add a regression test for argument copies with DestinationPropagation

This example, as a codegen test: https://github.com/rust-lang/rust/pull/105813#issuecomment-1367947793

r? `@tmiasko`
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bors 2023-01-11 19:56:44 +00:00
commit 1e4f90061c
1 changed files with 12 additions and 0 deletions
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tests/codegen/move-operands.rs Normal file
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// compile-flags: -C no-prepopulate-passes -Zmir-enable-passes=+DestinationPropagation
#![crate_type = "lib"]
type T = [u8; 256];
#[no_mangle]
pub fn f(a: T, b: fn(_: T, _: T)) {
// CHECK: call void @llvm.memcpy.{{.*}}({{i8\*|ptr}} align 1 %{{.*}}, {{i8\*|ptr}} align 1 %{{.*}}, {{.*}} 256, i1 false)
// CHECK-NOT: call void @llvm.memcpy.{{.*}}({{i8\*|ptr}} align 1 %{{.*}}, {{i8\*|ptr}} align 1 %{{.*}}, {{.*}} 256, i1 false)
b(a, a)
}