From b4387ac00dd6eec6ee1bef4736f02e646fa51428 Mon Sep 17 00:00:00 2001
From: psychocrypt <psychocryptHPC@gmail.com>
Date: Wed, 10 Oct 2018 12:04:30 +0200
Subject: [PATCH] fix right bitshift in `amd_bitalign`
In the current implementation the bit align is using signed integer which results in pulling in
ones in the case the sign bit is set.
- cast to unsigned integer before using bitshift
---
xmrstak/backend/amd/amd_gpu/opencl/cryptonight.cl | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/xmrstak/backend/amd/amd_gpu/opencl/cryptonight.cl b/xmrstak/backend/amd/amd_gpu/opencl/cryptonight.cl
index 7689b5d..9c9bcd0 100644
--- a/xmrstak/backend/amd/amd_gpu/opencl/cryptonight.cl
+++ b/xmrstak/backend/amd/amd_gpu/opencl/cryptonight.cl
@@ -35,8 +35,8 @@ R"===(
inline uint2 amd_bitalign( const uint2 src0, const uint2 src1, const uint src2)
{
uint2 result;
- result.s0 = (uint) (((((long)src0.s0) << 32) | (long)src1.s0) >> (src2));
- result.s1 = (uint) (((((long)src0.s1) << 32) | (long)src1.s1) >> (src2));
+ result.s0 = (uint) (((((ulong)src0.s0) << 32) | (ulong)src1.s0) >> (src2));
+ result.s1 = (uint) (((((ulong)src0.s1) << 32) | (ulong)src1.s1) >> (src2));
return result;
}
#endif
--
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