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
40 lines
1.4 KiB
C
40 lines
1.4 KiB
C
/* ===-- divsi3.c - Implement __divsi3 -------------------------------------===
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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 __divsi3 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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COMPILER_RT_ABI si_int
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__divsi3(si_int a, si_int b)
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{
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const int bits_in_word_m1 = (int)(sizeof(si_int) * CHAR_BIT) - 1;
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si_int s_a = a >> bits_in_word_m1; /* s_a = a < 0 ? -1 : 0 */
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si_int s_b = b >> bits_in_word_m1; /* s_b = b < 0 ? -1 : 0 */
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a = (a ^ s_a) - s_a; /* negate if s_a == -1 */
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b = (b ^ s_b) - s_b; /* negate if s_b == -1 */
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s_a ^= s_b; /* sign of quotient */
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/*
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* On CPUs without unsigned hardware division support,
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* this calls __udivsi3 (notice the cast to su_int).
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* On CPUs with unsigned hardware division support,
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* this uses the unsigned division instruction.
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*/
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return ((su_int)a/(su_int)b ^ s_a) - s_a; /* negate if s_a == -1 */
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}
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#if defined(__ARM_EABI__)
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AEABI_RTABI si_int __aeabi_idiv(si_int a, si_int b) COMPILER_RT_ALIAS(__divsi3);
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#endif
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