1 /*===---- bmiintrin.h - Implementation of BMI2 intrinsics on PowerPC -------=== 2 * 3 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 * See https://llvm.org/LICENSE.txt for license information. 5 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 * 7 *===-----------------------------------------------------------------------=== 8 */ 9 10 #if !defined X86GPRINTRIN_H_ 11 #error "Never use <bmi2intrin.h> directly; include <x86gprintrin.h> instead." 12 #endif 13 14 #ifndef BMI2INTRIN_H_ 15 #define BMI2INTRIN_H_ 16 17 extern __inline unsigned int 18 __attribute__((__gnu_inline__, __always_inline__, __artificial__)) 19 _bzhi_u32(unsigned int __X, unsigned int __Y) { 20 return ((__X << (32 - __Y)) >> (32 - __Y)); 21 } 22 23 extern __inline unsigned int 24 __attribute__((__gnu_inline__, __always_inline__, __artificial__)) 25 _mulx_u32(unsigned int __X, unsigned int __Y, unsigned int *__P) { 26 unsigned long long __res = (unsigned long long)__X * __Y; 27 *__P = (unsigned int)(__res >> 32); 28 return (unsigned int)__res; 29 } 30 31 #ifdef __PPC64__ 32 extern __inline unsigned long long 33 __attribute__((__gnu_inline__, __always_inline__, __artificial__)) 34 _bzhi_u64(unsigned long long __X, unsigned long long __Y) { 35 return ((__X << (64 - __Y)) >> (64 - __Y)); 36 } 37 38 /* __int128 requires base 64-bit. */ 39 extern __inline unsigned long long 40 __attribute__((__gnu_inline__, __always_inline__, __artificial__)) 41 _mulx_u64(unsigned long long __X, unsigned long long __Y, 42 unsigned long long *__P) { 43 unsigned __int128 __res = (unsigned __int128)__X * __Y; 44 *__P = (unsigned long long)(__res >> 64); 45 return (unsigned long long)__res; 46 } 47 48 #ifdef _ARCH_PWR7 49 /* popcount and bpermd require power7 minimum. */ 50 extern __inline unsigned long long 51 __attribute__((__gnu_inline__, __always_inline__, __artificial__)) 52 _pdep_u64(unsigned long long __X, unsigned long long __M) { 53 unsigned long __result = 0x0UL; 54 const unsigned long __mask = 0x8000000000000000UL; 55 unsigned long __m = __M; 56 unsigned long __c, __t; 57 unsigned long __p; 58 59 /* The pop-count of the mask gives the number of the bits from 60 source to process. This is also needed to shift bits from the 61 source into the correct position for the result. */ 62 __p = 64 - __builtin_popcountl(__M); 63 64 /* The loop is for the number of '1' bits in the mask and clearing 65 each mask bit as it is processed. */ 66 while (__m != 0) { 67 __c = __builtin_clzl(__m); 68 __t = __X << (__p - __c); 69 __m ^= (__mask >> __c); 70 __result |= (__t & (__mask >> __c)); 71 __p++; 72 } 73 return __result; 74 } 75 76 extern __inline unsigned long long 77 __attribute__((__gnu_inline__, __always_inline__, __artificial__)) 78 _pext_u64(unsigned long long __X, unsigned long long __M) { 79 unsigned long __p = 0x4040404040404040UL; // initial bit permute control 80 const unsigned long __mask = 0x8000000000000000UL; 81 unsigned long __m = __M; 82 unsigned long __c; 83 unsigned long __result; 84 85 /* if the mask is constant and selects 8 bits or less we can use 86 the Power8 Bit permute instruction. */ 87 if (__builtin_constant_p(__M) && (__builtin_popcountl(__M) <= 8)) { 88 /* Also if the pext mask is constant, then the popcount is 89 constant, we can evaluate the following loop at compile 90 time and use a constant bit permute vector. */ 91 long __i; 92 for (__i = 0; __i < __builtin_popcountl(__M); __i++) { 93 __c = __builtin_clzl(__m); 94 __p = (__p << 8) | __c; 95 __m ^= (__mask >> __c); 96 } 97 __result = __builtin_bpermd(__p, __X); 98 } else { 99 __p = 64 - __builtin_popcountl(__M); 100 __result = 0; 101 /* We could a use a for loop here, but that combined with 102 -funroll-loops can expand to a lot of code. The while 103 loop avoids unrolling and the compiler commons the xor 104 from clearing the mask bit with the (m != 0) test. The 105 result is a more compact loop setup and body. */ 106 while (__m != 0) { 107 unsigned long __t; 108 __c = __builtin_clzl(__m); 109 __t = (__X & (__mask >> __c)) >> (__p - __c); 110 __m ^= (__mask >> __c); 111 __result |= (__t); 112 __p++; 113 } 114 } 115 return __result; 116 } 117 118 /* these 32-bit implementations depend on 64-bit pdep/pext 119 which depend on _ARCH_PWR7. */ 120 extern __inline unsigned int 121 __attribute__((__gnu_inline__, __always_inline__, __artificial__)) 122 _pdep_u32(unsigned int __X, unsigned int __Y) { 123 return _pdep_u64(__X, __Y); 124 } 125 126 extern __inline unsigned int 127 __attribute__((__gnu_inline__, __always_inline__, __artificial__)) 128 _pext_u32(unsigned int __X, unsigned int __Y) { 129 return _pext_u64(__X, __Y); 130 } 131 #endif /* _ARCH_PWR7 */ 132 #endif /* __PPC64__ */ 133 134 #endif /* BMI2INTRIN_H_ */ 135