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/**************************************************************************
*
* 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)
{
static const int MAX_INTR_STR = 256;
LLVMBuilderRef builder = gallivm->builder;
char intr_str[MAX_INTR_STR];
LLVMTypeRef type_ref;
LLVMTypeKind type_kind;
LLVMTypeRef oelems[2] = {
LLVMInt32TypeInContext(gallivm->context),
LLVMInt1TypeInContext(gallivm->context)
};
LLVMValueRef oresult;
LLVMTypeRef otype;
debug_assert(LLVMTypeOf(a) == LLVMTypeOf(b));
type_ref = LLVMTypeOf(a);
type_kind = LLVMGetTypeKind(type_ref);
debug_assert(type_kind == LLVMIntegerTypeKind);
switch (LLVMGetIntTypeWidth(type_ref)) {
case 16:
snprintf(intr_str, MAX_INTR_STR - 1, "%s.i16",
intr_prefix);
oelems[0] = LLVMInt16TypeInContext(gallivm->context);
break;
case 32:
snprintf(intr_str, MAX_INTR_STR - 1, "%s.i32",
intr_prefix);
oelems[0] = LLVMInt32TypeInContext(gallivm->context);
break;
case 64:
snprintf(intr_str, MAX_INTR_STR - 1, "%s.i64",
intr_prefix);
oelems[0] = LLVMInt64TypeInContext(gallivm->context);
break;
default:
debug_assert(!"Unsupported integer width in overflow computation!");
}
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);
}
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