Cleanup Altivec and Power7 code paths

This changes the dependency from Altivec to Power7. Internally we needed Power7 but it was cut-in as a pseudo Altivec dependency. Also see http://groups.google.com/forum/#!topic/cryptopp-users/fmEKOG41SG8

1 files changed, 25 insertions, 2 deletions

diff --git a/cpu.h b/cpu.h
index 35710a93..66336489 100644
--- a/cpu.h
+++ b/cpu.h
@@ -407,8 +407,11 @@ void CRYPTOPP_API DetectPowerpcFeatures();
 //! \returns true if the hardware is capable of Altivec at runtime, false otherwise.

 //! \details Altivec instructions are available under most modern PowerPCs.

 //! \details Runtime support requires compile time support. When compiling with GCC, you may

-//!   need to compile with <tt>-mcpu=power8</tt>; while IBM XL C/C++ compilers require

-//!   <tt>-qarch=pwr8 -qaltivec</tt>. Also see PowerPC's <tt>_ALTIVEC_</tt> preprocessor macro.

+//!   need to compile with <tt>-mcpu=power7</tt>; while IBM XL C/C++ compilers require

+//!   <tt>-qarch=pwr7 -qaltivec</tt>. Also see PowerPC's <tt>_ALTIVEC_</tt> preprocessor macro.

+//! \details Atilvec was first available on Power4 platforms. However Crypto++ releies on unaligned

+//!   loads and stores which is a Power7 feature. If the platform lacks Power7 extensions, then the

+//!   GNUmakefile sets <tt>-DCRYPTOPP_DISABLE_ALTIVEC</tt>.

 //! \note This function is only available on PowerPC and PowerPC-64 platforms

 inline bool HasAltivec()

 {

@@ -423,6 +426,26 @@ inline bool HasAltivec()
 //! \details Runtime support requires compile time support. When compiling with GCC, you may

 //!   need to compile with <tt>-mcpu=power8</tt>; while IBM XL C/C++ compilers require

 //!   <tt>-qarch=pwr8 -qaltivec</tt>. Also see PowerPC's <tt>_ALTIVEC_</tt> preprocessor macro.

+//! \details Atilvec was first available on Power4 platforms. However Crypto++ releies on unaligned

+//!   loads and stores which is a Power7 feature. If the platform lacks Power7 extensions, then the

+//!   GNUmakefile sets <tt>-DCRYPTOPP_DISABLE_ALTIVEC</tt>.

+//! \note This function is only available on PowerPC and PowerPC-64 platforms

+inline bool HasPower7()

+{

+	if (!g_PowerpcDetectionDone)

+		DetectPowerpcFeatures();

+	return g_hasPower7;

+}

+

+//! \brief Determine if a PowerPC processor has Power8 available

+//! \returns true if the hardware is capable of Power8 at runtime, false otherwise.

+//! \details Altivec instructions are available under most modern PowerPCs.

+//! \details Runtime support requires compile time support. When compiling with GCC, you may

+//!   need to compile with <tt>-mcpu=power8</tt>; while IBM XL C/C++ compilers require

+//!   <tt>-qarch=pwr8 -qaltivec</tt>. Also see PowerPC's <tt>_ALTIVEC_</tt> preprocessor macro.

+//! \details Atilvec was first available on Power4 platforms. However Crypto++ releies on unaligned

+//!   loads and stores which is a Power7 feature. If the platform lacks Power7 extensions, then the

+//!   GNUmakefile sets <tt>-DCRYPTOPP_DISABLE_ALTIVEC</tt>.

 //! \note This function is only available on PowerPC and PowerPC-64 platforms

 inline bool HasPower8()

 {