| 1 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 2 | // See https://llvm.org/LICENSE.txt for license information. |
| 3 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 4 | |
| 5 | #include "../assembly.h" |
| 6 | |
| 7 | // di_int __muldi3(di_int a, di_int b); |
| 8 | |
| 9 | #ifdef __i386__ |
| 10 | |
| 11 | .text |
| 12 | .balign 4 |
| 13 | DEFINE_COMPILERRT_FUNCTION(__muldi3) |
| 14 | pushl %ebx |
| 15 | movl 16(%esp), %eax // b.lo |
| 16 | movl 12(%esp), %ecx // a.hi |
| 17 | imull %eax, %ecx // b.lo * a.hi |
| 18 | |
| 19 | movl 8(%esp), %edx // a.lo |
| 20 | movl 20(%esp), %ebx // b.hi |
| 21 | imull %edx, %ebx // a.lo * b.hi |
| 22 | |
| 23 | mull %edx // EDX:EAX = a.lo * b.lo |
| 24 | addl %ecx, %ebx // EBX = (a.lo*b.hi + a.hi*b.lo) |
| 25 | addl %ebx, %edx |
| 26 | |
| 27 | popl %ebx |
| 28 | retl |
| 29 | END_COMPILERRT_FUNCTION(__muldi3) |
| 30 | |
| 31 | #endif // __i386__ |
| 32 | |
| 33 | NO_EXEC_STACK_DIRECTIVE |
| 34 | |
| 35 | |