Port Sleef to AIX (#629)

Closes #628.

Author: KamathForAIX

Configure.cmake

@@ -197,7 +197,7 @@ elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "arm")
   set(COMPILER_SUPPORTS_NEON32VFPV4 1)
 
   set(CLANG_FLAGS_ENABLE_PURECFMA_SCALAR "-mfpu=vfpv4")
-elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64")
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64" OR CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)")
   set(SLEEF_ARCH_PPC64 ON CACHE INTERNAL "True for PPC64 architecture.")
 
   set(CLANG_FLAGS_ENABLE_PURECFMA_SCALAR "-mvsx")
@@ -626,8 +626,8 @@ if(SLEEF_ARCH_PPC64 AND NOT SLEEF_DISABLE_VSX)
   string (REPLACE ";" " " CMAKE_REQUIRED_FLAGS "${FLAGS_ENABLE_VSX}")
   CHECK_C_SOURCE_COMPILES("
   #include <altivec.h>
-  #ifndef __LITTLE_ENDIAN__
-    #error \"Only VSX(ISA2.07) little-endian mode is supported \"
+  #if !defined(__LITTLE_ENDIAN__) && !defined(_AIX)
+    #error \"Only VSX(ISA2.07) little-endian mode and AIX is supported \"
   #endif
   int main() {
     vector double d;

src/common/quaddef.h

@@ -16,6 +16,9 @@
 #if !defined(Sleef_quad_DEFINED)
 #define Sleef_quad_DEFINED
 typedef struct { uint64_t x, y; } Sleef_uint64_2t;
+#ifdef _AIX
+#undef  SLEEF_FLOAT128_IS_IEEEQP
+#endif
 #if defined(SLEEF_FLOAT128_IS_IEEEQP) || defined(ENABLEFLOAT128)
 typedef __float128 Sleef_quad;
 #define SLEEF_QUAD_C(x) (x ## Q)

src/libm/sleeflibm_header.h.org.in

@@ -63,7 +63,7 @@
 #include <arm_sve.h>
 #endif
 
-#if defined(__VSX__) && defined(__PPC64__) && defined(__LITTLE_ENDIAN__)
+#if (defined(__VSX__) && defined(__PPC64__) && defined(__LITTLE_ENDIAN__)) || defined(_AIX)
 #include <altivec.h>
 typedef __vector double       SLEEF_VECTOR_DOUBLE;
 typedef __vector float        SLEEF_VECTOR_FLOAT;
@@ -175,6 +175,9 @@ typedef struct {
 #if !defined(Sleef_quad_DEFINED)
 #define Sleef_quad_DEFINED
 typedef struct { uint64_t x, y; } Sleef_uint64_2t;
+#ifdef _AIX
+#undef SLEEF_FLOAT128_IS_IEEEQP
+#endif
 #if defined(SLEEF_FLOAT128_IS_IEEEQP) || defined(ENABLEFLOAT128)
 typedef __float128 Sleef_quad;
 #define SLEEF_QUAD_C(x) (x ## Q)