Set CRYPTOPP_L1_CACHE_LINE_SIZE to 128 for PowerPC cpus

1 files changed, 8 insertions, 1 deletions

diff --git a/config_cpu.h b/config_cpu.h
index 27007c85..700c72d8 100644
--- a/config_cpu.h
+++ b/config_cpu.h
@@ -132,6 +132,10 @@
 	/// \brief L1 data cache line size

 	/// \details CRYPTOPP_L1_CACHE_LINE_SIZE should be a lower bound on the L1

 	///  data cache line size. It is used for defense against some timing attacks.

+	/// \details CRYPTOPP_L1_CACHE_LINE_SIZE default value on 32-bit platforms

+	///  is 32, and the default value on 64-bit platforms is 64. On PowerPC the

+	///  default value is 128 since all PowerPC cpu's starting at PPC 970 provide

+	///  it.

 	/// \note The runtime library on some PowerPC platforms misreport the size

 	///  of the cache line size. The runtime library reports 64, while the cpu

 	///  has a cache line size of 128.

@@ -142,8 +146,11 @@
 #else

 	#ifndef CRYPTOPP_L1_CACHE_LINE_SIZE

 		#if defined(CRYPTOPP_BOOL_X32) || defined(CRYPTOPP_BOOL_X64) || defined(CRYPTOPP_BOOL_ARMV8) || \

-			defined(CRYPTOPP_BOOL_PPC64) || defined(CRYPTOPP_BOOL_MIPS64) || defined(CRYPTOPP_BOOL_SPARC64)

+		    defined(CRYPTOPP_BOOL_MIPS64) || defined(CRYPTOPP_BOOL_SPARC64)

 			#define CRYPTOPP_L1_CACHE_LINE_SIZE 64

+		#elif defined(CRYPTOPP_BOOL_PPC32) || defined(CRYPTOPP_BOOL_PPC64)

+			// http://lists.llvm.org/pipermail/llvm-dev/2017-March/110982.html

+			#define CRYPTOPP_L1_CACHE_LINE_SIZE 128

 		#else

 			// L1 cache line size is 32 on Pentium III and earlier

 			#define CRYPTOPP_L1_CACHE_LINE_SIZE 32