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RISC-V: Improvements of inline assembly uses #1921

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Merged
merged 1 commit into from
Sep 15, 2025
Merged

RISC-V: Improvements of inline assembly uses #1921

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21 changes: 18 additions & 3 deletions crates/core_arch/src/riscv64/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,12 @@ pub use zk::*;
#[unstable(feature = "riscv_ext_intrinsics", issue = "114544")]
pub unsafe fn hlv_wu(src: *const u32) -> u32 {
let value: u32;
asm!(".insn i 0x73, 0x4, {}, {}, 0x681", out(reg) value, in(reg) src, options(readonly, nostack));
asm!(
".insn i 0x73, 0x4, {}, {}, 0x681",
lateout(reg) value,
in(reg) src,
options(readonly, nostack, preserves_flags)
);
value
}

Expand All @@ -38,7 +43,12 @@ pub unsafe fn hlv_wu(src: *const u32) -> u32 {
#[unstable(feature = "riscv_ext_intrinsics", issue = "114544")]
pub unsafe fn hlv_d(src: *const i64) -> i64 {
let value: i64;
asm!(".insn i 0x73, 0x4, {}, {}, 0x6C0", out(reg) value, in(reg) src, options(readonly, nostack));
asm!(
".insn i 0x73, 0x4, {}, {}, 0x6C0",
lateout(reg) value,
in(reg) src,
options(readonly, nostack, preserves_flags)
);
value
}

Expand All @@ -53,5 +63,10 @@ pub unsafe fn hlv_d(src: *const i64) -> i64 {
#[inline]
#[unstable(feature = "riscv_ext_intrinsics", issue = "114544")]
pub unsafe fn hsv_d(dst: *mut i64, src: i64) {
asm!(".insn r 0x73, 0x4, 0x37, x0, {}, {}", in(reg) dst, in(reg) src, options(nostack));
asm!(
".insn r 0x73, 0x4, 0x37, x0, {}, {}",
in(reg) dst,
in(reg) src,
options(nostack, preserves_flags)
);
}
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