From 65b82e2c4b4a8f78935d9149bddb2dff47256ebe Mon Sep 17 00:00:00 2001
From: Valentin Clement <clementval@gmail.com>
Date: Thu, 14 Aug 2025 10:09:12 -0700
Subject: [PATCH] [flang][cuda] Add interfaces for __uint2float_rX functions

---
 flang/module/cudadevice.f90              | 30 +++++++++++++++++++++++-
 flang/test/Lower/CUDA/cuda-libdevice.cuf | 24 +++++++++++++++++++
 2 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/flang/module/cudadevice.f90 b/flang/module/cudadevice.f90
index 4f3625a8b07af..18ec90fe3dc36 100644
--- a/flang/module/cudadevice.f90
+++ b/flang/module/cudadevice.f90
@@ -576,8 +576,36 @@ attributes(device) real(8) function sinpi(x) bind(c,name='__nv_sinpi')
     end function
   end interface
 
+  interface __uint2float_rd
+    attributes(device) real function __uint2float_rd(i) bind(c, name='__nv_uint2float_rd')
+      !dir$ ignore_tkr (d) i
+      integer, value :: i
+    end function
+  end interface
+
+  interface __uint2float_rn
+    attributes(device) real function __uint2float_rn(i) bind(c, name='__nv_uint2float_rn')
+      !dir$ ignore_tkr (d) i
+      integer, value :: i
+    end function
+  end interface
+
+  interface __uint2float_ru
+    attributes(device) real function __uint2float_ru(i) bind(c, name='__nv_uint2float_ru')
+      !dir$ ignore_tkr (d) i
+      integer, value :: i
+    end function
+  end interface
+
+  interface __uint2float_rz
+    attributes(device) real function __uint2float_rz(i) bind(c, name='__nv_uint2float_rz')
+      !dir$ ignore_tkr (d) i
+      integer, value :: i
+    end function
+  end interface
+
   interface __uint2double_rn
-    attributes(device) double precision function __uint2double_rn(i) bind(c)
+    attributes(device) double precision function __uint2double_rn(i) bind(c, name='__nv_uint2double_rn')
       !dir$ ignore_tkr (d) i
       integer, value :: i
     end function
diff --git a/flang/test/Lower/CUDA/cuda-libdevice.cuf b/flang/test/Lower/CUDA/cuda-libdevice.cuf
index 10e4c2757d825..f5f630c6ff056 100644
--- a/flang/test/Lower/CUDA/cuda-libdevice.cuf
+++ b/flang/test/Lower/CUDA/cuda-libdevice.cuf
@@ -19,3 +19,27 @@ end subroutine
 
 ! CHECK-LABEL: _QPtest_usad
 ! CHECK: %{{.*}} = fir.call @__nv_usad(%{{.*}}, %{{.*}}, %{{.*}}) proc_attrs<bind_c> fastmath<contract> : (i32, i32, i32) -> i32
+
+attributes(global) subroutine test_uint2float_rX()
+  real :: res
+  integer :: i
+  res = __uint2float_rd(i)
+  res = __uint2float_rn(i)
+  res = __uint2float_ru(i)
+  res = __uint2float_rz(i)
+end subroutine
+
+! CHECK-LABEL: _QPtest_uint2float_rx
+! CHECK: %{{.*}} = fir.call @__nv_uint2float_rd(%{{.*}}) proc_attrs<bind_c> fastmath<contract> : (i32) -> f32
+! CHECK: %{{.*}} = fir.call @__nv_uint2float_rn(%{{.*}}) proc_attrs<bind_c> fastmath<contract> : (i32) -> f32
+! CHECK: %{{.*}} = fir.call @__nv_uint2float_ru(%{{.*}}) proc_attrs<bind_c> fastmath<contract> : (i32) -> f32
+! CHECK: %{{.*}} = fir.call @__nv_uint2float_rz(%{{.*}}) proc_attrs<bind_c> fastmath<contract> : (i32) -> f32
+
+attributes(global) subroutine test_uint2double_rn()
+  double precision :: res
+  integer :: i
+  res = __uint2double_rn(i)
+end subroutine
+
+! CHECK-LABEL: _QPtest_uint2double_rn
+! CHECK: %{{.*}} = fir.call @__nv_uint2double_rn(%{{.*}}) proc_attrs<bind_c> fastmath<contract> : (i32) -> f64