From 0f0a12012c227e7160001baf419fe8e28b07779a Mon Sep 17 00:00:00 2001
From: Valentin Clement <clementval@gmail.com>
Date: Tue, 12 Aug 2025 13:22:00 -0700
Subject: [PATCH] [flang][cuda] Add bind name for __double2float_XX interfaces

---
 flang/module/cudadevice.f90                |  8 ++++----
 flang/test/Lower/CUDA/cuda-device-proc.cuf | 10 ++++++++++
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/flang/module/cudadevice.f90 b/flang/module/cudadevice.f90
index 1b3c98b3e3f96..4d287074158ff 100644
--- a/flang/module/cudadevice.f90
+++ b/flang/module/cudadevice.f90
@@ -501,28 +501,28 @@ attributes(device) real(8) function sinpi(x) bind(c,name='__nv_sinpi')
   end interface
 
   interface __double2float_rn
-    attributes(device) real function __double2float_rn(r) bind(c)
+    attributes(device) real function __double2float_rn(r) bind(c, name='__nv_double2float_rn')
       !dir$ ignore_tkr (d) r
       double precision, value :: r
     end function
   end interface
 
   interface __double2float_rz
-    attributes(device) real function __double2float_rz(r) bind(c)
+    attributes(device) real function __double2float_rz(r) bind(c, name='__nv_double2float_rz')
       !dir$ ignore_tkr (d) r
       double precision, value :: r
     end function
   end interface
 
   interface __double2float_ru
-    attributes(device) real function __double2float_ru(r) bind(c)
+    attributes(device) real function __double2float_ru(r) bind(c, name='__nv_double2float_ru')
       !dir$ ignore_tkr (d) r
       double precision, value :: r
     end function
   end interface
 
   interface __double2float_rd
-    attributes(device) real function __double2float_rd(r) bind(c)
+    attributes(device) real function __double2float_rd(r) bind(c, name='__nv_double2float_rd')
       !dir$ ignore_tkr (d) r
       double precision, value :: r
     end function
diff --git a/flang/test/Lower/CUDA/cuda-device-proc.cuf b/flang/test/Lower/CUDA/cuda-device-proc.cuf
index 24600291b788a..43555c0b2b4e8 100644
--- a/flang/test/Lower/CUDA/cuda-device-proc.cuf
+++ b/flang/test/Lower/CUDA/cuda-device-proc.cuf
@@ -58,6 +58,11 @@ attributes(global) subroutine devsub()
   res = __ffs(al)
   res = __brev(ai)
   resl = __brev(al)
+
+  af = __double2float_rn(ad)
+  af = __double2float_rz(ad)
+  af = __double2float_ru(ad)
+  af = __double2float_rd(ad)
 end
 
 ! CHECK-LABEL: func.func @_QPdevsub() attributes {cuf.proc_attr = #cuf.cuda_proc<global>}
@@ -105,6 +110,11 @@ end
 ! CHECK: %{{.*}} = fir.call @__nv_brev(%{{.*}}) proc_attrs<bind_c> fastmath<contract> : (i32) -> i32
 ! CHECK: %{{.*}} = fir.call @__nv_brevll(%{{.*}}) proc_attrs<bind_c> fastmath<contract> : (i64) -> i64
 
+! CHECK: %{{.*}} = fir.call @__nv_double2float_rn(%{{.*}}) proc_attrs<bind_c> fastmath<contract> : (f64) -> f32
+! CHECK: %{{.*}} = fir.call @__nv_double2float_rz(%{{.*}}) proc_attrs<bind_c> fastmath<contract> : (f64) -> f32
+! CHECK: %{{.*}} = fir.call @__nv_double2float_ru(%{{.*}}) proc_attrs<bind_c> fastmath<contract> : (f64) -> f32
+! CHECK: %{{.*}} = fir.call @__nv_double2float_rd(%{{.*}}) proc_attrs<bind_c> fastmath<contract> : (f64) -> f32
+
 subroutine host1()
   integer, device :: a(32)
   integer, device :: ret