0d586d06a7
r303188 removed all the uses of aliases for EABI functions from compiler-rt, because some of them had mismatched calling conventions. Obviously, we can't use aliases for functions which don't have the same calling convention, but that's only an issue for floating-point functions with the hardfloat ABI. In other cases, the stubs increase size and reduce performance for no benefit. This patch adds back the aliases, with appropriate checks to make sure they're only used in cases where the calling convention matches. llvm-svn: 314851
59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/* ===-- muldi3.c - Implement __muldi3 -------------------------------------===
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*
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* The LLVM Compiler Infrastructure
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*
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* This file is dual licensed under the MIT and the University of Illinois Open
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* Source Licenses. See LICENSE.TXT for details.
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*
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* ===----------------------------------------------------------------------===
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*
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* This file implements __muldi3 for the compiler_rt library.
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*
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* ===----------------------------------------------------------------------===
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*/
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#include "int_lib.h"
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/* Returns: a * b */
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static
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di_int
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__muldsi3(su_int a, su_int b)
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{
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dwords r;
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const int bits_in_word_2 = (int)(sizeof(si_int) * CHAR_BIT) / 2;
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const su_int lower_mask = (su_int)~0 >> bits_in_word_2;
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r.s.low = (a & lower_mask) * (b & lower_mask);
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su_int t = r.s.low >> bits_in_word_2;
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r.s.low &= lower_mask;
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t += (a >> bits_in_word_2) * (b & lower_mask);
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r.s.low += (t & lower_mask) << bits_in_word_2;
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r.s.high = t >> bits_in_word_2;
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t = r.s.low >> bits_in_word_2;
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r.s.low &= lower_mask;
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t += (b >> bits_in_word_2) * (a & lower_mask);
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r.s.low += (t & lower_mask) << bits_in_word_2;
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r.s.high += t >> bits_in_word_2;
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r.s.high += (a >> bits_in_word_2) * (b >> bits_in_word_2);
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return r.all;
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}
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/* Returns: a * b */
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COMPILER_RT_ABI di_int
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__muldi3(di_int a, di_int b)
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{
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dwords x;
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x.all = a;
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dwords y;
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y.all = b;
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dwords r;
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r.all = __muldsi3(x.s.low, y.s.low);
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r.s.high += x.s.high * y.s.low + x.s.low * y.s.high;
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return r.all;
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}
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#if defined(__ARM_EABI__)
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AEABI_RTABI di_int __aeabi_lmul(di_int a, di_int b) COMPILER_RT_ALIAS(__muldi3);
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#endif
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