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Use memset when repeating 128bit zero value

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This commit is contained in:
Tomasz Miąsko 2022-09-09 00:00:00 +00:00
parent 7279106166
commit e4d3abfe77
1 changed files with 1 additions and 1 deletions
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compiler/rustc_codegen_ssa/src/mir/rvalue.rs
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@ -87,7 +87,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
let size = bx.const_usize(dest.layout.size.bytes()); let size = bx.const_usize(dest.layout.size.bytes());
// Use llvm.memset.p0i8.* to initialize all zero arrays // Use llvm.memset.p0i8.* to initialize all zero arrays
if bx.cx().const_to_opt_uint(v) == Some(0) { if bx.cx().const_to_opt_u128(v, false) == Some(0) {
let fill = bx.cx().const_u8(0); let fill = bx.cx().const_u8(0);
bx.memset(start, fill, size, dest.align, MemFlags::empty()); bx.memset(start, fill, size, dest.align, MemFlags::empty());
return bx; return bx;