From 638d2b5141193e08e22f1aecb592396dbf05856d Mon Sep 17 00:00:00 2001 From: Sandrine Bailleux Date: Wed, 31 Oct 2018 13:37:42 +0100 Subject: [PATCH] compiler_rt: Import lshrdi3.c file Imported from the LLVM compiler_rt library on master branch as of 30 Oct 2018 (SVN revision: r345645). This is to get the __aeabi_llsr() builtin, which is required by a subsequent patch that uses a logical right shift operator in AArch32. Change-Id: I9884139a12855a8a87206fb572aaa7dd35582b09 Signed-off-by: Sandrine Bailleux --- lib/compiler-rt/builtins/lshrdi3.c | 45 ++++++++++++++++++++++++++++++ lib/compiler-rt/compiler-rt.mk | 3 +- 2 files changed, 47 insertions(+), 1 deletion(-) create mode 100644 lib/compiler-rt/builtins/lshrdi3.c diff --git a/lib/compiler-rt/builtins/lshrdi3.c b/lib/compiler-rt/builtins/lshrdi3.c new file mode 100644 index 00000000..67b2a766 --- /dev/null +++ b/lib/compiler-rt/builtins/lshrdi3.c @@ -0,0 +1,45 @@ +/* ===-- lshrdi3.c - Implement __lshrdi3 -----------------------------------=== + * + * The LLVM Compiler Infrastructure + * + * This file is dual licensed under the MIT and the University of Illinois Open + * Source Licenses. See LICENSE.TXT for details. + * + * ===----------------------------------------------------------------------=== + * + * This file implements __lshrdi3 for the compiler_rt library. + * + * ===----------------------------------------------------------------------=== + */ + +#include "int_lib.h" + +/* Returns: logical a >> b */ + +/* Precondition: 0 <= b < bits_in_dword */ + +COMPILER_RT_ABI di_int +__lshrdi3(di_int a, si_int b) +{ + const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT); + udwords input; + udwords result; + input.all = a; + if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */ + { + result.s.high = 0; + result.s.low = input.s.high >> (b - bits_in_word); + } + else /* 0 <= b < bits_in_word */ + { + if (b == 0) + return a; + result.s.high = input.s.high >> b; + result.s.low = (input.s.high << (bits_in_word - b)) | (input.s.low >> b); + } + return result.all; +} + +#if defined(__ARM_EABI__) +AEABI_RTABI di_int __aeabi_llsr(di_int a, si_int b) COMPILER_RT_ALIAS(__lshrdi3); +#endif diff --git a/lib/compiler-rt/compiler-rt.mk b/lib/compiler-rt/compiler-rt.mk index cb5ab31c..49e497eb 100644 --- a/lib/compiler-rt/compiler-rt.mk +++ b/lib/compiler-rt/compiler-rt.mk @@ -31,5 +31,6 @@ ifeq (${ARCH},aarch32) COMPILER_RT_SRCS := lib/compiler-rt/builtins/arm/aeabi_uldivmod.S \ lib/compiler-rt/builtins/udivmoddi4.c \ - lib/compiler-rt/builtins/ctzdi2.c + lib/compiler-rt/builtins/ctzdi2.c \ + lib/compiler-rt/builtins/lshrdi3.c endif -- 2.30.2