diff options
Diffstat (limited to 'third_party/libaeabi-cortexm0/core/cortex-m0/lmul.S')
| -rw-r--r-- | third_party/libaeabi-cortexm0/core/cortex-m0/lmul.S | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/third_party/libaeabi-cortexm0/core/cortex-m0/lmul.S b/third_party/libaeabi-cortexm0/core/cortex-m0/lmul.S new file mode 100644 index 0000000000..ab04fd488f --- /dev/null +++ b/third_party/libaeabi-cortexm0/core/cortex-m0/lmul.S @@ -0,0 +1,65 @@ +/* Runtime ABI for the ARM Cortex-M0 + * lmul.S: 64 bit multiplication + * + * Copyright (c) 2013 Jörg Mische <bobbl@gmx.de> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT + * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + + + + .syntax unified + .text + .thumb + .cpu cortex-m0 + + + +@ long long __aeabi_lmul(long long r1:r0, long long r3:r2) +@ +@ Multiply r1:r0 and r3:r2 and return the product in r1:r0 +@ Can also be used for unsigned long product +@ + .thumb_func + .section .text.__aeabi_lmul + .global __aeabi_lmul +__aeabi_lmul: + + push {r4, lr} + muls r1, r2 + muls r3, r0 + adds r1, r3 + + lsrs r3, r0, #16 + lsrs r4, r2, #16 + muls r3, r4 + adds r1, r3 + + lsrs r3, r0, #16 + uxth r0, r0 + uxth r2, r2 + muls r3, r2 + muls r4, r0 + muls r0, r2 + + movs r2, #0 + adds r3, r4 + adcs r2, r2 + lsls r2, #16 + adds r1, r2 + + lsls r2, r3, #16 + lsrs r3, #16 + adds r0, r2 + adcs r1, r3 + pop {r4, pc} |