| 0,0 → 1,151 |
|---|
| /************************************************************************** |
| * |
| * Copyright 2013 |
| * 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 |
| * |
| * The functions in this file implement arthmetic operations with support |
| * for overflow detection and reporting. |
| * |
| */ |
| |
| #include "lp_bld_arit_overflow.h" |
| |
| #include "lp_bld_type.h" |
| #include "lp_bld_const.h" |
| #include "lp_bld_init.h" |
| #include "lp_bld_intr.h" |
| #include "lp_bld_logic.h" |
| #include "lp_bld_pack.h" |
| #include "lp_bld_debug.h" |
| #include "lp_bld_bitarit.h" |
| |
| #include "util/u_memory.h" |
| #include "util/u_debug.h" |
| #include "util/u_math.h" |
| #include "util/u_string.h" |
| #include "util/u_cpu_detect.h" |
| |
| #include <float.h> |
| |
| |
| static LLVMValueRef |
| build_binary_int_overflow(struct gallivm_state *gallivm, |
| const char *intr_prefix, |
| LLVMValueRef a, |
| LLVMValueRef b, |
| LLVMValueRef *ofbit) |
| { |
| LLVMBuilderRef builder = gallivm->builder; |
| char intr_str[256]; |
| LLVMTypeRef type_ref; |
| LLVMTypeKind type_kind; |
| unsigned type_width; |
| LLVMTypeRef oelems[2]; |
| LLVMValueRef oresult; |
| LLVMTypeRef otype; |
| |
| debug_assert(LLVMTypeOf(a) == LLVMTypeOf(b)); |
| type_ref = LLVMTypeOf(a); |
| type_kind = LLVMGetTypeKind(type_ref); |
| |
| debug_assert(type_kind == LLVMIntegerTypeKind); |
| type_width = LLVMGetIntTypeWidth(type_ref); |
| |
| debug_assert(type_width == 16 || type_width == 32 || type_width == 64); |
| |
| util_snprintf(intr_str, sizeof intr_str, "%s.i%u", |
| intr_prefix, type_width); |
| |
| oelems[0] = type_ref; |
| oelems[1] = LLVMInt1TypeInContext(gallivm->context); |
| |
| otype = LLVMStructTypeInContext(gallivm->context, oelems, 2, FALSE); |
| oresult = lp_build_intrinsic_binary(builder, intr_str, |
| otype, a, b); |
| if (ofbit) { |
| if (*ofbit) { |
| *ofbit = LLVMBuildOr( |
| builder, *ofbit, |
| LLVMBuildExtractValue(builder, oresult, 1, ""), ""); |
| } else { |
| *ofbit = LLVMBuildExtractValue(builder, oresult, 1, ""); |
| } |
| } |
| |
| return LLVMBuildExtractValue(builder, oresult, 0, ""); |
| } |
| |
| /** |
| * Performs unsigned addition of two integers and reports |
| * overflow if detected. |
| * |
| * The values @a and @b must be of the same integer type. If |
| * an overflow is detected the IN/OUT @ofbit parameter is used: |
| * - if it's pointing to a null value, the overflow bit is simply |
| * stored inside the variable it's pointing to, |
| * - if it's pointing to a valid value, then that variable, |
| * which must be of i1 type, is ORed with the newly detected |
| * overflow bit. This is done to allow chaining of a number of |
| * overflow functions together without having to test the |
| * overflow bit after every single one. |
| */ |
| LLVMValueRef |
| lp_build_uadd_overflow(struct gallivm_state *gallivm, |
| LLVMValueRef a, |
| LLVMValueRef b, |
| LLVMValueRef *ofbit) |
| { |
| return build_binary_int_overflow(gallivm, "llvm.uadd.with.overflow", |
| a, b, ofbit); |
| } |
| |
| /** |
| * Performs unsigned multiplication of two integers and |
| * reports overflow if detected. |
| * |
| * The values @a and @b must be of the same integer type. If |
| * an overflow is detected the IN/OUT @ofbit parameter is used: |
| * - if it's pointing to a null value, the overflow bit is simply |
| * stored inside the variable it's pointing to, |
| * - if it's pointing to a valid value, then that variable, |
| * which must be of i1 type, is ORed with the newly detected |
| * overflow bit. This is done to allow chaining of a number of |
| * overflow functions together without having to test the |
| * overflow bit after every single one. |
| */ |
| LLVMValueRef |
| lp_build_umul_overflow(struct gallivm_state *gallivm, |
| LLVMValueRef a, |
| LLVMValueRef b, |
| LLVMValueRef *ofbit) |
| { |
| return build_binary_int_overflow(gallivm, "llvm.umul.with.overflow", |
| a, b, ofbit); |
| } |