feat(hugr-llvm): Emit rounding operation for FloatOps::fround extension ops

hugr-llvm/src/extension/float.rs

@@ -103,6 +103,17 @@ fn emit_float_op<'c, H: HugrView<Node = Node>>(
                     .as_basic_value_enum(),
             ])
         }),
+        FloatOps::fround => emit_custom_unary_op(context, args, |ctx, v, _| {
+            let float_ty = ctx.iw_context().f64_type().as_basic_type_enum();
+            let func = get_intrinsic(ctx.get_current_module(), "llvm.round.f64", [float_ty])?;
+            Ok(vec![
+                ctx.builder()
+                    .build_call(func, &[v.into()], "")?
+                    .try_as_basic_value()
+                    .unwrap_basic()
+                    .as_basic_value_enum(),
+            ])
+        }),
         // Missing ops, not supported by inkwell
         FloatOps::fmax
         | FloatOps::fmin
@@ -215,6 +226,7 @@ mod test {
     #[case::fmul(FloatOps::fmul)]
     #[case::fdiv(FloatOps::fdiv)]
     #[case::fpow(FloatOps::fpow)]
+    #[case::fround(FloatOps::fround)]
     fn float_operations(mut llvm_ctx: TestContext, #[case] op: FloatOps) {
         let name: &str = op.into();
         let hugr = test_float_op(op);

hugr-llvm/src/extension/snapshots/hugr_llvm__extension__float__test__fround@llvm21.snap

@@ -0,0 +1,21 @@
+---
+source: hugr-llvm/src/extension/float.rs
+assertion_line: 234
+expression: mod_str
+---
+; ModuleID = 'test_context'
+source_filename = "test_context"
+
+define internal double @_hl.main.1(double %0) {
+alloca_block:
+  br label %entry_block
+
+entry_block:                                      ; preds = %alloca_block
+  %1 = call double @llvm.round.f64(double %0)
+  ret double %1
+}
+
+; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
+declare double @llvm.round.f64(double) #0
+
+attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

hugr-llvm/src/extension/snapshots/hugr_llvm__extension__float__test__fround@pre-mem2reg@llvm21.snap

@@ -0,0 +1,30 @@
+---
+source: hugr-llvm/src/extension/float.rs
+assertion_line: 234
+expression: mod_str
+---
+; ModuleID = 'test_context'
+source_filename = "test_context"
+
+define internal double @_hl.main.1(double %0) {
+alloca_block:
+  %"0" = alloca double, align 8
+  %"2_0" = alloca double, align 8
+  %"4_0" = alloca double, align 8
+  br label %entry_block
+
+entry_block:                                      ; preds = %alloca_block
+  store double %0, ptr %"2_0", align 8
+  %"2_01" = load double, ptr %"2_0", align 8
+  %1 = call double @llvm.round.f64(double %"2_01")
+  store double %1, ptr %"4_0", align 8
+  %"4_02" = load double, ptr %"4_0", align 8
+  store double %"4_02", ptr %"0", align 8
+  %"03" = load double, ptr %"0", align 8
+  ret double %"03"
+}
+
+; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
+declare double @llvm.round.f64(double) #0
+
+attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }