Rollup merge of #124003 - WaffleLapkin:dellvmization, r=scottmcm,RalfJung,antoyo

Dellvmize some intrinsics (use `u32` instead of `Self` in some integer intrinsics)

This implements https://github.com/rust-lang/compiler-team/issues/693 minus what was implemented in #123226.

Note: I decided to _not_ change `shl`/... builder methods, as it just doesn't seem worth it.

r? ``@scottmcm``

1 files changed, 19 insertions, 8 deletions

diff --git a/compiler/rustc_codegen_llvm/src/intrinsic.rs b/compiler/rustc_codegen_llvm/src/intrinsic.rs
index 2bed7c1bd1c..ab9f20fdf63 100644
--- a/compiler/rustc_codegen_llvm/src/intrinsic.rs
+++ b/compiler/rustc_codegen_llvm/src/intrinsic.rs
@@ -315,25 +315,32 @@ impl<'ll, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'_, 'll, 'tcx> {
                     Some((width, signed)) => match name {
                         sym::ctlz | sym::cttz => {
                             let y = self.const_bool(false);
-                            self.call_intrinsic(
+                            let ret = self.call_intrinsic(
                                 &format!("llvm.{name}.i{width}"),
                                 &[args[0].immediate(), y],
-                            )
+                            );
+
+                            self.intcast(ret, llret_ty, false)
                         }
                         sym::ctlz_nonzero => {
                             let y = self.const_bool(true);
                             let llvm_name = &format!("llvm.ctlz.i{width}");
-                            self.call_intrinsic(llvm_name, &[args[0].immediate(), y])
+                            let ret = self.call_intrinsic(llvm_name, &[args[0].immediate(), y]);
+                            self.intcast(ret, llret_ty, false)
                         }
                         sym::cttz_nonzero => {
                             let y = self.const_bool(true);
                             let llvm_name = &format!("llvm.cttz.i{width}");
-                            self.call_intrinsic(llvm_name, &[args[0].immediate(), y])
+                            let ret = self.call_intrinsic(llvm_name, &[args[0].immediate(), y]);
+                            self.intcast(ret, llret_ty, false)
+                        }
+                        sym::ctpop => {
+                            let ret = self.call_intrinsic(
+                                &format!("llvm.ctpop.i{width}"),
+                                &[args[0].immediate()],
+                            );
+                            self.intcast(ret, llret_ty, false)
                         }
-                        sym::ctpop => self.call_intrinsic(
-                            &format!("llvm.ctpop.i{width}"),
-                            &[args[0].immediate()],
-                        ),
                         sym::bswap => {
                             if width == 8 {
                                 args[0].immediate() // byte swap a u8/i8 is just a no-op
@@ -355,6 +362,10 @@ impl<'ll, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'_, 'll, 'tcx> {
                             // rotate = funnel shift with first two args the same
                             let llvm_name =
                                 &format!("llvm.fsh{}.i{}", if is_left { 'l' } else { 'r' }, width);
+
+                            // llvm expects shift to be the same type as the values, but rust always uses `u32`
+                            let raw_shift = self.intcast(raw_shift, self.val_ty(val), false);
+
                             self.call_intrinsic(llvm_name, &[val, val, raw_shift])
                         }
                         sym::saturating_add | sym::saturating_sub => {