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Diffstat (limited to 'runtime/ia32/i64_smulh.S')
| -rw-r--r-- | runtime/ia32/i64_smulh.S | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/runtime/ia32/i64_smulh.S b/runtime/ia32/i64_smulh.S deleted file mode 100644 index cc0f0167..00000000 --- a/runtime/ia32/i64_smulh.S +++ /dev/null @@ -1,94 +0,0 @@ -// ***************************************************************** -// -// The Compcert verified compiler -// -// Xavier Leroy, INRIA Paris -// -// Copyright (c) 2016 Institut National de Recherche en Informatique et -// en Automatique. -// -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are met: -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// * Redistributions in binary form must reproduce the above copyright -// notice, this list of conditions and the following disclaimer in the -// documentation and/or other materials provided with the distribution. -// * Neither the name of the <organization> nor the -// names of its contributors may be used to endorse or promote products -// derived from this software without specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT -// HOLDER> BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, -// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, -// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR -// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF -// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING -// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS -// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -// -// ********************************************************************* - -// Helper functions for 64-bit integer arithmetic. IA32 version. - -#include "sysdeps.h" - -// Multiply-high signed - -#define XL 12(%esp) -#define XH 16(%esp) -#define YL 20(%esp) -#define YH 24(%esp) - -// Hacker's Delight section 8.3: -// - compute high 64 bits of the unsigned product X * Y (see i64_umulh.S) -// - subtract X if Y < 0 -// - subtract Y if X < 0 - -FUNCTION(__i64_smulh) - pushl %esi - pushl %edi - movl XL, %eax - mull YL // EDX:EAX = 64-bit product XL.YL - movl %edx, %ecx - xorl %esi, %esi - xorl %edi, %edi // EDI:ESI:ECX accumulatesbits 127:32 of result - movl XH, %eax - mull YL // EDX:EAX = 64-bit product XH.YL - addl %eax, %ecx - adcl %edx, %esi - adcl $0, %edi - movl YH, %eax - mull XL // EDX:EAX = 64-bit product YH.XL - addl %eax, %ecx - adcl %edx, %esi - adcl $0, %edi - movl XH, %eax - mull YH // EDX:EAX = 64-bit product XH.YH - addl %eax, %esi - adcl %edx, %edi -// Here, EDI:ESI is the high 64 bits of the unsigned product X.Y - xorl %eax, %eax - xorl %edx, %edx - cmpl $0, XH - cmovl YL, %eax - cmovl YH, %edx // EDX:EAX = Y if X < 0, = 0 if X >= 0 - subl %eax, %esi - sbbl %edx, %edi // EDI:ESI -= Y if X < 0 - xorl %eax, %eax - xorl %edx, %edx - cmpl $0, YH - cmovl XL, %eax - cmovl XH, %edx // EDX:EAX = X if Y < 0, = 0 if Y >= 0 - subl %eax, %esi - sbbl %edx, %edi // EDI:ESI -= X if Y < 0 -// Now EDI:ESI contains the high 64 bits of the signed product X.Y - movl %esi, %eax - movl %edi, %edx - popl %edi - popl %esi - ret -ENDFUNCTION(__i64_smulh) |