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tests: Split dont-shuffle-bswaps along opt-levels and arches #142176

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merged 2 commits into from
Jun 13, 2025
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tests: Split dont-shuffle-bswaps along opt-levels and arches #142176

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5906998
tests: Copy dont-shuffle-bswaps per tested opt level
workingjubilee Jun 7, 2025
6b0deb2
tests: Revise dont-shuffle-bswaps-opt3 per tested arch
workingjubilee Jun 7, 2025
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31 changes: 31 additions & 0 deletions tests/codegen/autovec/dont-shuffle-bswaps-opt2.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,31 @@
//@ compile-flags: -Copt-level=2

#![crate_type = "lib"]
#![no_std]

// This test is paired with the arch-specific -opt3.rs test.

// The code is from https://github.com/rust-lang/rust/issues/122805.
// Ensure we do not generate the shufflevector instruction
// to avoid complicating the code.

// CHECK-LABEL: define{{.*}}void @convert(
// CHECK-NOT: shufflevector
#[no_mangle]
pub fn convert(value: [u16; 8]) -> [u8; 16] {
#[cfg(target_endian = "little")]
let bswap = u16::to_be;
#[cfg(target_endian = "big")]
let bswap = u16::to_le;
let addr16 = [
bswap(value[0]),
bswap(value[1]),
bswap(value[2]),
bswap(value[3]),
bswap(value[4]),
bswap(value[5]),
bswap(value[6]),
bswap(value[7]),
];
unsafe { core::mem::transmute::<_, [u8; 16]>(addr16) }
}
30 changes: 14 additions & 16 deletions tests/codegen/dont-shuffle-bswaps.rs → ...degen/autovec/dont-shuffle-bswaps-opt3.rs
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Original file line number Diff line number Diff line change
@@ -1,29 +1,27 @@
//@ revisions: OPT2 OPT3 OPT3_S390X
//@[OPT2] compile-flags: -Copt-level=2
//@[OPT3] compile-flags: -C opt-level=3
// some targets don't do the opt we are looking for
//@[OPT3] only-64bit
//@[OPT3] ignore-s390x
//@[OPT3_S390X] compile-flags: -C opt-level=3 -C target-cpu=z13
//@[OPT3_S390X] only-s390x
//@ revisions: AARCH64 X86_64 Z13
//@ compile-flags: -Copt-level=3
//@[AARCH64] only-aarch64
//@[X86_64] only-x86_64
//@[Z13] only-s390x
//@[Z13] compile-flags: -Ctarget-cpu=z13

#![crate_type = "lib"]
#![no_std]

// This test is paired with the arch-neutral -opt2.rs test

// The code is from https://github.com/rust-lang/rust/issues/122805.
// Ensure we do not generate the shufflevector instruction
// to avoid complicating the code.

// CHECK-LABEL: define{{.*}}void @convert(
// CHECK-NOT: shufflevector

// On higher opt levels, this should just be a bswap:
// OPT3: load <8 x i16>
// OPT3-NEXT: call <8 x i16> @llvm.bswap
// OPT3-NEXT: store <8 x i16>
// OPT3-NEXT: ret void
// OPT3_S390X: load <8 x i16>
// OPT3_S390X-NEXT: call <8 x i16> @llvm.bswap
// OPT3_S390X-NEXT: store <8 x i16>
// OPT3_S390X-NEXT: ret void
// CHECK: load <8 x i16>
// CHECK-NEXT: call <8 x i16> @llvm.bswap
// CHECK-NEXT: store <8 x i16>
// CHECK-NEXT: ret void
#[no_mangle]
pub fn convert(value: [u16; 8]) -> [u8; 16] {
#[cfg(target_endian = "little")]
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