diff options
| author | Jordan Rupprecht <rupprecht@google.com> | 2019-05-14 21:58:59 +0000 |
|---|---|---|
| committer | Jordan Rupprecht <rupprecht@google.com> | 2019-05-14 21:58:59 +0000 |
| commit | b6bc976d7be8ee56d3be4b6dbd2f3ab0a4021c86 (patch) | |
| tree | f5ed5db8cb5d237a073ea00c4d4cd63153a16a6c /lib/builtins/i386/ashrdi3.S | |
| parent | 05342ccc9cff16425c0a831fddd510879544a0bf (diff) | |
| parent | 098ca93185735ec3687106d0967a70fc99a85059 (diff) | |
| download | compiler-rt-google/stable.tar.gz | |
Creating branches/google/stable and tags/google/stable/2019-05-14 from r360103google/stable
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/branches/google/stable@360714 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/builtins/i386/ashrdi3.S')
| -rw-r--r-- | lib/builtins/i386/ashrdi3.S | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/lib/builtins/i386/ashrdi3.S b/lib/builtins/i386/ashrdi3.S index 206369f36..3cca4782a 100644 --- a/lib/builtins/i386/ashrdi3.S +++ b/lib/builtins/i386/ashrdi3.S @@ -1,5 +1,6 @@ -// This file is dual licensed under the MIT and the University of Illinois Open -// Source Licenses. See LICENSE.TXT for details. +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception #include "../assembly.h" @@ -22,10 +23,10 @@ DEFINE_COMPILERRT_FUNCTION(__ashrdi3) #endif psrlq %xmm2, %xmm0 // unsigned shift input by count - + testl %eax, %eax // check the sign-bit of the input jns 1f // early out for positive inputs - + // If the input is negative, we need to construct the shifted sign bit // to or into the result, as xmm does not have a signed right shift. pcmpeqb %xmm1, %xmm1 // -1ULL @@ -35,7 +36,7 @@ DEFINE_COMPILERRT_FUNCTION(__ashrdi3) psubq %xmm1, %xmm2 // 64 - count psllq %xmm2, %xmm1 // -1 << (64 - count) = leading sign bits por %xmm1, %xmm0 - + // Move the result back to the general purpose registers and return 1: movd %xmm0, %eax psrlq $32, %xmm0 @@ -51,14 +52,14 @@ DEFINE_COMPILERRT_FUNCTION(__ashrdi3) movl 12(%esp), %ecx // Load count movl 8(%esp), %edx // Load high movl 4(%esp), %eax // Load low - + testl $0x20, %ecx // If count >= 32 jnz 1f // goto 1 shrdl %cl, %edx, %eax // right shift low by count sarl %cl, %edx // right shift high by count ret - + 1: movl %edx, %eax // Move high to low sarl $31, %edx // clear high sarl %cl, %eax // shift low by count - 32 |