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26fa5c2c30
Instead of not generating the function at all on big endian (which makes the CHECK lines fail), instead use to_le() on big endian, so that we essentially perform a bswap for both endiannesses.
59 lines
1.8 KiB
Rust
59 lines
1.8 KiB
Rust
//@ revisions: OPT2 OPT3WINX64 OPT3LINX64
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//@ [OPT2] compile-flags: -O
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//@ [OPT3LINX64] compile-flags: -C opt-level=3
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//@ [OPT3WINX64] compile-flags: -C opt-level=3
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//@ [OPT3LINX64] only-linux
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//@ [OPT3WINX64] only-windows
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//@ [OPT3LINX64] only-x86_64
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//@ [OPT3WINX64] only-x86_64
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//@ min-llvm-version: 18.1.3
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#![crate_type = "lib"]
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#![no_std]
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// The code is from https://github.com/rust-lang/rust/issues/122805.
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// Ensure we do not generate the shufflevector instruction
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// to avoid complicating the code.
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// CHECK-LABEL: define{{.*}}void @convert(
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// CHECK-NOT: shufflevector
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// OPT2: store i16
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// OPT2-NEXT: getelementptr inbounds i8, {{.+}} 2
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// OPT2-NEXT: store i16
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// OPT2-NEXT: getelementptr inbounds i8, {{.+}} 4
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// OPT2-NEXT: store i16
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// OPT2-NEXT: getelementptr inbounds i8, {{.+}} 6
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// OPT2-NEXT: store i16
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// OPT2-NEXT: getelementptr inbounds i8, {{.+}} 8
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// OPT2-NEXT: store i16
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// OPT2-NEXT: getelementptr inbounds i8, {{.+}} 10
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// OPT2-NEXT: store i16
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// OPT2-NEXT: getelementptr inbounds i8, {{.+}} 12
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// OPT2-NEXT: store i16
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// OPT2-NEXT: getelementptr inbounds i8, {{.+}} 14
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// OPT2-NEXT: store i16
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// OPT3LINX64: load <8 x i16>
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// OPT3LINX64-NEXT: call <8 x i16> @llvm.bswap
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// OPT3LINX64-NEXT: store <8 x i16>
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// OPT3WINX64: load <8 x i16>
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// OPT3WINX64-NEXT: call <8 x i16> @llvm.bswap
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// OPT3WINX64-NEXT: store <8 x i16>
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// CHECK-NEXT: ret void
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#[no_mangle]
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pub fn convert(value: [u16; 8]) -> [u8; 16] {
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#[cfg(target_endian = "little")]
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let bswap = u16::to_be;
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#[cfg(target_endian = "big")]
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let bswap = u16::to_le;
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let addr16 = [
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bswap(value[0]),
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bswap(value[1]),
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bswap(value[2]),
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bswap(value[3]),
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bswap(value[4]),
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bswap(value[5]),
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bswap(value[6]),
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bswap(value[7]),
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];
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unsafe { core::mem::transmute::<_, [u8; 16]>(addr16) }
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}
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