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Unify LLVM ctlz/cttz intrinsic generation

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This commit is contained in:
Tobias Decking
2025-07-25 17:56:10 +02:00
parent b56aaec52b
commit 948c7952b8
1 changed files with 9 additions and 19 deletions
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28
compiler/rustc_codegen_llvm/src/intrinsic.rs
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@@ -382,26 +382,16 @@ impl<'ll, 'tcx> IntrinsicCallBuilderMethods<'tcx> for Builder<'_, 'll, 'tcx> {
let width = size.bits();
let llty = self.type_ix(width);
match name {
sym::ctlz | sym::cttz => {
let y = self.const_bool(false);
let ret = self.call_intrinsic(
format!("llvm.{name}"),
&[llty],
&[args[0].immediate(), y],
);
self.intcast(ret, result.layout.llvm_type(self), false)
}
sym::ctlz_nonzero => {
let y = self.const_bool(true);
sym::ctlz | sym::ctlz_nonzero | sym::cttz | sym::cttz_nonzero => {
let y =
self.const_bool(name == sym::ctlz_nonzero || name == sym::cttz_nonzero);
let llvm_name = if name == sym::ctlz || name == sym::ctlz_nonzero {
"llvm.ctlz"
} else {
"llvm.cttz"
};
let ret =
self.call_intrinsic("llvm.ctlz", &[llty], &[args[0].immediate(), y]);
self.intcast(ret, result.layout.llvm_type(self), false)
}
sym::cttz_nonzero => {
let y = self.const_bool(true);
let ret =
self.call_intrinsic("llvm.cttz", &[llty], &[args[0].immediate(), y]);
self.call_intrinsic(llvm_name, &[llty], &[args[0].immediate(), y]);
self.intcast(ret, result.layout.llvm_type(self), false)
}
sym::ctpop => {