| /************************************************************************** |
| * |
| * Copyright 2009 VMware, Inc. |
| * All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the |
| * "Software"), to deal in the Software without restriction, including |
| * without limitation the rights to use, copy, modify, merge, publish, |
| * distribute, sub license, and/or sell copies of the Software, and to |
| * permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the |
| * next paragraph) shall be included in all copies or substantial portions |
| * of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. |
| * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR |
| * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| * |
| **************************************************************************/ |
| |
| |
| /** |
| * @file |
| * Helper functions for constant building. |
| * |
| * @author Jose Fonseca <jfonseca@vmware.com> |
| */ |
| |
| #include <float.h> |
| |
| #include "util/u_debug.h" |
| |
| #include "lp_bld_type.h" |
| #include "lp_bld_const.h" |
| |
| |
| unsigned |
| lp_mantissa(struct lp_type type) |
| { |
| assert(type.floating); |
| |
| if(type.floating) { |
| switch(type.width) { |
| case 32: |
| return 23; |
| case 64: |
| return 53; |
| default: |
| assert(0); |
| return 0; |
| } |
| } |
| else { |
| if(type.sign) |
| return type.width - 1; |
| else |
| return type.width; |
| } |
| } |
| |
| |
| /** |
| * Shift of the unity. |
| * |
| * Same as lp_const_scale(), but in terms of shifts. |
| */ |
| unsigned |
| lp_const_shift(struct lp_type type) |
| { |
| if(type.floating) |
| return 0; |
| else if(type.fixed) |
| return type.width/2; |
| else if(type.norm) |
| return type.sign ? type.width - 1 : type.width; |
| else |
| return 0; |
| } |
| |
| |
| unsigned |
| lp_const_offset(struct lp_type type) |
| { |
| if(type.floating || type.fixed) |
| return 0; |
| else if(type.norm) |
| return 1; |
| else |
| return 0; |
| } |
| |
| |
| /** |
| * Scaling factor between the LLVM native value and its interpretation. |
| * |
| * This is 1.0 for all floating types and unnormalized integers, and something |
| * else for the fixed points types and normalized integers. |
| */ |
| double |
| lp_const_scale(struct lp_type type) |
| { |
| unsigned long long llscale; |
| double dscale; |
| |
| llscale = (unsigned long long)1 << lp_const_shift(type); |
| llscale -= lp_const_offset(type); |
| dscale = (double)llscale; |
| assert((unsigned long long)dscale == llscale); |
| |
| return dscale; |
| } |
| |
| |
| /** |
| * Minimum value representable by the type. |
| */ |
| double |
| lp_const_min(struct lp_type type) |
| { |
| unsigned bits; |
| |
| if(!type.sign) |
| return 0.0; |
| |
| if(type.norm) |
| return -1.0; |
| |
| if (type.floating) { |
| switch(type.width) { |
| case 32: |
| return -FLT_MAX; |
| case 64: |
| return -DBL_MAX; |
| default: |
| assert(0); |
| return 0.0; |
| } |
| } |
| |
| if(type.fixed) |
| /* FIXME: consider the fractional bits? */ |
| bits = type.width / 2 - 1; |
| else |
| bits = type.width - 1; |
| |
| return (double)-((long long)1 << bits); |
| } |
| |
| |
| /** |
| * Maximum value representable by the type. |
| */ |
| double |
| lp_const_max(struct lp_type type) |
| { |
| unsigned bits; |
| |
| if(type.norm) |
| return 1.0; |
| |
| if (type.floating) { |
| switch(type.width) { |
| case 32: |
| return FLT_MAX; |
| case 64: |
| return DBL_MAX; |
| default: |
| assert(0); |
| return 0.0; |
| } |
| } |
| |
| if(type.fixed) |
| bits = type.width / 2; |
| else |
| bits = type.width; |
| |
| if(type.sign) |
| bits -= 1; |
| |
| return (double)(((unsigned long long)1 << bits) - 1); |
| } |
| |
| |
| double |
| lp_const_eps(struct lp_type type) |
| { |
| if (type.floating) { |
| switch(type.width) { |
| case 32: |
| return FLT_EPSILON; |
| case 64: |
| return DBL_EPSILON; |
| default: |
| assert(0); |
| return 0.0; |
| } |
| } |
| else { |
| double scale = lp_const_scale(type); |
| return 1.0/scale; |
| } |
| } |
| |
| |
| LLVMValueRef |
| lp_build_undef(struct lp_type type) |
| { |
| LLVMTypeRef vec_type = lp_build_vec_type(type); |
| return LLVMGetUndef(vec_type); |
| } |
| |
| |
| LLVMValueRef |
| lp_build_zero(struct lp_type type) |
| { |
| LLVMTypeRef vec_type = lp_build_vec_type(type); |
| return LLVMConstNull(vec_type); |
| } |
| |
| |
| LLVMValueRef |
| lp_build_one(struct lp_type type) |
| { |
| LLVMTypeRef elem_type; |
| LLVMValueRef elems[LP_MAX_VECTOR_LENGTH]; |
| unsigned i; |
| |
| assert(type.length <= LP_MAX_VECTOR_LENGTH); |
| |
| elem_type = lp_build_elem_type(type); |
| |
| if(type.floating) |
| elems[0] = LLVMConstReal(elem_type, 1.0); |
| else if(type.fixed) |
| elems[0] = LLVMConstInt(elem_type, 1LL << (type.width/2), 0); |
| else if(!type.norm) |
| elems[0] = LLVMConstInt(elem_type, 1, 0); |
| else if(type.sign) |
| elems[0] = LLVMConstInt(elem_type, (1LL << (type.width - 1)) - 1, 0); |
| else { |
| /* special case' -- 1.0 for normalized types is more easily attained if |
| * we start with a vector consisting of all bits set */ |
| LLVMTypeRef vec_type = LLVMVectorType(elem_type, type.length); |
| LLVMValueRef vec = LLVMConstAllOnes(vec_type); |
| |
| #if 0 |
| if(type.sign) |
| /* TODO: Unfortunately this caused "Tried to create a shift operation |
| * on a non-integer type!" */ |
| vec = LLVMConstLShr(vec, lp_build_int_const_scalar(type, 1)); |
| #endif |
| |
| return vec; |
| } |
| |
| for(i = 1; i < type.length; ++i) |
| elems[i] = elems[0]; |
| |
| return LLVMConstVector(elems, type.length); |
| } |
| |
| |
| LLVMValueRef |
| lp_build_const_scalar(struct lp_type type, |
| double val) |
| { |
| LLVMTypeRef elem_type = lp_build_elem_type(type); |
| LLVMValueRef elems[LP_MAX_VECTOR_LENGTH]; |
| unsigned i; |
| |
| assert(type.length <= LP_MAX_VECTOR_LENGTH); |
| |
| if(type.floating) { |
| elems[0] = LLVMConstReal(elem_type, val); |
| } |
| else { |
| double dscale = lp_const_scale(type); |
| |
| elems[0] = LLVMConstInt(elem_type, val*dscale + 0.5, 0); |
| } |
| |
| for(i = 1; i < type.length; ++i) |
| elems[i] = elems[0]; |
| |
| return LLVMConstVector(elems, type.length); |
| } |
| |
| |
| LLVMValueRef |
| lp_build_int_const_scalar(struct lp_type type, |
| long long val) |
| { |
| LLVMTypeRef elem_type = lp_build_int_elem_type(type); |
| LLVMValueRef elems[LP_MAX_VECTOR_LENGTH]; |
| unsigned i; |
| |
| assert(type.length <= LP_MAX_VECTOR_LENGTH); |
| |
| for(i = 0; i < type.length; ++i) |
| elems[i] = LLVMConstInt(elem_type, val, type.sign ? 1 : 0); |
| |
| return LLVMConstVector(elems, type.length); |
| } |
| |
| |
| LLVMValueRef |
| lp_build_const_aos(struct lp_type type, |
| double r, double g, double b, double a, |
| const unsigned char *swizzle) |
| { |
| const unsigned char default_swizzle[4] = {0, 1, 2, 3}; |
| LLVMTypeRef elem_type; |
| LLVMValueRef elems[LP_MAX_VECTOR_LENGTH]; |
| unsigned i; |
| |
| assert(type.length % 4 == 0); |
| assert(type.length <= LP_MAX_VECTOR_LENGTH); |
| |
| elem_type = lp_build_elem_type(type); |
| |
| if(swizzle == NULL) |
| swizzle = default_swizzle; |
| |
| if(type.floating) { |
| elems[swizzle[0]] = LLVMConstReal(elem_type, r); |
| elems[swizzle[1]] = LLVMConstReal(elem_type, g); |
| elems[swizzle[2]] = LLVMConstReal(elem_type, b); |
| elems[swizzle[3]] = LLVMConstReal(elem_type, a); |
| } |
| else { |
| double dscale = lp_const_scale(type); |
| |
| elems[swizzle[0]] = LLVMConstInt(elem_type, r*dscale + 0.5, 0); |
| elems[swizzle[1]] = LLVMConstInt(elem_type, g*dscale + 0.5, 0); |
| elems[swizzle[2]] = LLVMConstInt(elem_type, b*dscale + 0.5, 0); |
| elems[swizzle[3]] = LLVMConstInt(elem_type, a*dscale + 0.5, 0); |
| } |
| |
| for(i = 4; i < type.length; ++i) |
| elems[i] = elems[i % 4]; |
| |
| return LLVMConstVector(elems, type.length); |
| } |
| |
| |
| LLVMValueRef |
| lp_build_const_mask_aos(struct lp_type type, |
| const boolean cond[4]) |
| { |
| LLVMTypeRef elem_type = LLVMIntType(type.width); |
| LLVMValueRef masks[LP_MAX_VECTOR_LENGTH]; |
| unsigned i, j; |
| |
| assert(type.length <= LP_MAX_VECTOR_LENGTH); |
| |
| for(j = 0; j < type.length; j += 4) |
| for(i = 0; i < 4; ++i) |
| masks[j + i] = LLVMConstInt(elem_type, cond[i] ? ~0 : 0, 0); |
| |
| return LLVMConstVector(masks, type.length); |
| } |