| commit | bf7b94d40739428fda3d798b4add833054f7d012 | |
| author | Jozef Lawrynowicz <jozef.l@mittosystems.com> | |
| Sun, 15 Nov 2020 21:03:14 +0000 (15 21:03 +0000) | ||
| committer | Jozef Lawrynowicz <jozef.l@mittosystems.com> | |
| Wed, 18 Nov 2020 11:05:27 +0000 (18 11:05 +0000) | ||
| tree | af1a2afd2aaa765b753f3b65ead1c8d815516618 | treesnapshot (tar.gz zip) |
| parent | e045b85836091f2461263a3c3f4f1972b3753f9d | commitdiff |
MSP430: Add 64-bit hardware multiply support
Hardware multipliers that support widening 32-bit multiplication can
be used to perform a 64-bit * 64-bit multiplication more efficiently
than a software implementation.
The following equation is used to perform 64-bit multiplication for
devices with "32bit" or "f5series" hardware multiply versions:
64bit_result = (low32_op0 * lop32_op1)
+ ((low32_op0 * high32_op1) << 32)
+ ((high32_op0 * low32_op1) << 32)
libgcc/ChangeLog:
* config/msp430/lib2hw_mul.S (mult64_hw): New.
(if MUL_32): Use mult64_hw for __muldi3.
(if MUL_F5): Use mult64_hw for __muldi3.
* config/msp430/lib2mul.c (__muldi3): New.
* config/msp430/t-msp430 (LIB2FUNCS_EXCLUDE): Define.
Hardware multipliers that support widening 32-bit multiplication can
be used to perform a 64-bit * 64-bit multiplication more efficiently
than a software implementation.
The following equation is used to perform 64-bit multiplication for
devices with "32bit" or "f5series" hardware multiply versions:
64bit_result = (low32_op0 * lop32_op1)
+ ((low32_op0 * high32_op1) << 32)
+ ((high32_op0 * low32_op1) << 32)
libgcc/ChangeLog:
* config/msp430/lib2hw_mul.S (mult64_hw): New.
(if MUL_32): Use mult64_hw for __muldi3.
(if MUL_F5): Use mult64_hw for __muldi3.
* config/msp430/lib2mul.c (__muldi3): New.
* config/msp430/t-msp430 (LIB2FUNCS_EXCLUDE): Define.
| libgcc/config/msp430/lib2hw_mul.S | diffblobblamehistory | |
| libgcc/config/msp430/lib2mul.c | diffblobblamehistory | |
| libgcc/config/msp430/t-msp430 | diffblobblamehistory |