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| author | Michal Simek <monstr@monstr.eu> | 2010-08-12 16:28:53 +0400 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2010-10-21 09:51:42 +0400 |
| commit | 4e07dba7cb8c9c76a52d0e32b69f13bb583a9674 (patch) | |
| tree | 2f12579e642d5eea3c28f4b7c51a35a465b5e2a2 /arch/microblaze/lib/mulsi3.S | |
| parent | cec051671dc2bb72cc2870aa149d7101ea494b8b (diff) | |
| download | linux-4e07dba7cb8c9c76a52d0e32b69f13bb583a9674.tar.xz | |
microblaze: Add libgcc function directly to kernel
Replaced libgcc functions with asm optimized implementation.
Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/lib/mulsi3.S')
| -rw-r--r-- | arch/microblaze/lib/mulsi3.S | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/microblaze/lib/mulsi3.S b/arch/microblaze/lib/mulsi3.S new file mode 100644 index 000000000000..90bd7b93afe6 --- /dev/null +++ b/arch/microblaze/lib/mulsi3.S @@ -0,0 +1,46 @@ +#include <linux/linkage.h> + +/* + * Multiply operation for 32 bit integers. + * Input : Operand1 in Reg r5 + * Operand2 in Reg r6 + * Output: Result [op1 * op2] in Reg r3 + */ + .text + .globl __mulsi3 + .type __mulsi3, @function + .ent __mulsi3 + +__mulsi3: + .frame r1, 0, r15 + add r3, r0, r0 + beqi r5, result_is_zero /* multiply by zero */ + beqi r6, result_is_zero /* multiply by zero */ + bgeid r5, r5_pos + xor r4, r5, r6 /* get the sign of the result */ + rsubi r5, r5, 0 /* make r5 positive */ +r5_pos: + bgei r6, r6_pos + rsubi r6, r6, 0 /* make r6 positive */ +r6_pos: + bri l1 +l2: + add r5, r5, r5 +l1: + srl r6, r6 + addc r7, r0, r0 + beqi r7, l2 + bneid r6, l2 + add r3, r3, r5 + blti r4, negateresult + rtsd r15, 8 + nop +negateresult: + rtsd r15, 8 + rsub r3, r3, r0 +result_is_zero: + rtsd r15, 8 + addi r3, r0, 0 + +.size __mulsi3, . - __mulsi3 +.end __mulsi3 |