From accfbcba62b44d364774954805757fa1dc28760c Mon Sep 17 00:00:00 2001
From: Matt Pharr <matt@pharr.org>
Date: Wed, 31 Aug 2022 15:57:58 -0700
Subject: [PATCH] Attempt to enable compute 5.2 for NVIDIA GPU support

Issue #292.
---
 cmake/checkcuda.cu    | 2 +-
 src/pbrt/util/float.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/cmake/checkcuda.cu b/cmake/checkcuda.cu
index cc6463d..f12b790 100644
--- a/cmake/checkcuda.cu
+++ b/cmake/checkcuda.cu
@@ -5,7 +5,7 @@
 
 int main(int argc, char **argv){
     cudaDeviceProp dP;
-    float min_cc = 5.3;  // We need half floats...
+    float min_cc = 5.2;
 
     int rc = cudaGetDeviceProperties(&dP, 0);
     if(rc != cudaSuccess) {
diff --git a/src/pbrt/util/float.h b/src/pbrt/util/float.h
index b318442..f0df1fb 100644
--- a/src/pbrt/util/float.h
+++ b/src/pbrt/util/float.h
@@ -499,7 +499,7 @@ class Half {
 
     PBRT_CPU_GPU
     bool operator==(const Half &v) const {
-#ifdef PBRT_IS_GPU_CODE
+#if defined(PBRT_IS_GPU_CODE) && __CUDA_ARCH__ >= 530
         return __ushort_as_half(h) == __ushort_as_half(v.h);
 #else
         if (Bits() == v.Bits())
-- 
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