From 07b068147c09eb7898f3c880bf4b4a7929654453 Mon Sep 17 00:00:00 2001
From: Trevor Gross <tmgross@umich.edu>
Date: Fri, 3 Jan 2025 05:28:39 +0000
Subject: [PATCH] Add tests against MPFR for `scalbn{f}` and `ldexp{f}`

---
 crates/libm-test/src/mpfloat.rs          | 28 ++++++++++++++++++++++++
 crates/libm-test/tests/multiprecision.rs |  4 ----
 2 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/crates/libm-test/src/mpfloat.rs b/crates/libm-test/src/mpfloat.rs
index 4d40858f2..8b8298004 100644
--- a/crates/libm-test/src/mpfloat.rs
+++ b/crates/libm-test/src/mpfloat.rs
@@ -292,6 +292,34 @@ macro_rules! impl_op_for_ty {
                 }
             }
 
+            // `ldexp` and `scalbn` are the same for binary floating point, so just forward all
+            // methods.
+            impl MpOp for crate::op::[<ldexp $suffix>]::Routine {
+                type MpTy = <crate::op::[<scalbn $suffix>]::Routine as MpOp>::MpTy;
+
+                fn new_mp() -> Self::MpTy {
+                    <crate::op::[<scalbn $suffix>]::Routine as MpOp>::new_mp()
+                }
+
+                fn run(this: &mut Self::MpTy, input: Self::RustArgs) -> Self::RustRet {
+                    <crate::op::[<scalbn $suffix>]::Routine as MpOp>::run(this, input)
+                }
+            }
+
+            impl MpOp for crate::op::[<scalbn $suffix>]::Routine {
+                type MpTy = MpFloat;
+
+                fn new_mp() -> Self::MpTy {
+                    new_mpfloat::<Self::FTy>()
+                }
+
+                fn run(this: &mut Self::MpTy, input: Self::RustArgs) -> Self::RustRet {
+                    this.assign(input.0);
+                    *this <<= input.1;
+                    prep_retval::<Self::FTy>(this, Ordering::Equal)
+                }
+            }
+
             impl MpOp for crate::op::[<sincos $suffix>]::Routine {
                 type MpTy = (MpFloat, MpFloat);
 
diff --git a/crates/libm-test/tests/multiprecision.rs b/crates/libm-test/tests/multiprecision.rs
index ade5a2553..4cdba0942 100644
--- a/crates/libm-test/tests/multiprecision.rs
+++ b/crates/libm-test/tests/multiprecision.rs
@@ -54,12 +54,8 @@ libm_macros::for_each_function! {
         // FIXME: MPFR tests needed
         ilogb,
         ilogbf,
-        ldexp,
-        ldexpf,
         remquo,
         remquof,
-        scalbn,
-        scalbnf,
 
         // FIXME: test needed, see
         // https://github.com/rust-lang/libm/pull/311#discussion_r1818273392