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asmmemfuncs.h
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#ifndef _ASMMEMFUNCS_H_
#define _ASMMEMFUNCS_H_
#define memset32(_dst, _c, _count) \
({ uint32_t *dst = (_dst); uint32_t c = (_c); int count = (_count); uint32_t dummy0, dummy1, dummy2; \
__asm__ __volatile__ ( \
" cmp %[count], #4\n" \
" blt 2f\n" \
" mov %[dummy0], %[c]\n" \
" tst %[dst], #4\n" \
" strne %[c], [%[dst]], #4\n" \
" subne %[count], %[count], #1\n" \
" tst %[dst], #8\n" \
" stmneia %[dst]!, {%[dummy0], %[c]}\n" \
" subne %[count], %[count], #2\n" \
" mov %[dummy1], %[c]\n" \
" mov %[dummy2], %[c]\n" \
"1:\n"\
" subs %[count], %[count], #4\n" \
" stmgeia %[dst]!, {%[dummy0], %[dummy1], %[dummy2], %[c]}\n" \
" bge 1b\n" \
" add %[count], %[count], #4\n" \
"2:\n"\
" subs %[count], %[count], #1\n" \
" strge %[c], [%[dst]], #4\n" \
" subs %[count], %[count], #1\n" \
" strge %[c], [%[dst]], #4\n" \
" subs %[count], %[count], #1\n" \
" strge %[c], [%[dst]], #4\n" \
"\n" \
: [dst] "+&r" (dst), [count] "+&r" (count), [dummy0] "=&r" (dummy0), [dummy1] "=&r" (dummy1), [dummy2] "=&r" (dummy2), [c] "+&r" (c) \
: \
: "cc", "memory" \
); _dst; \
})
#define memset16(_dst, _c, _count) \
({ uint16_t *dst = (_dst); uint16_t c = (_c); int count = (_count); uint32_t dummy0, dummy1, dummy2; \
__asm__ __volatile__ ( \
" cmp %[count], #2\n" \
" blt 3f\n" \
/* Alignment is known to be at least 16-bit */ \
" tst %[dst], #2\n" \
" strneh %[c], [%[dst]], #2\n" \
" subne %[count], %[count], #1\n" \
/* Now we are 32-bit aligned (need to upgrade 'c' to 32-bit )*/ \
" orr %[c], %[c], %[c], asl #16\n" \
" mov %[dummy0], %[c]\n" \
" cmp %[count], #8\n" \
" blt 2f\n" \
" tst %[dst], #4\n" \
" strne %[c], [%[dst]], #4\n" \
" subne %[count], %[count], #2\n" \
" tst %[dst], #8\n" \
" stmneia %[dst]!, {%[dummy0], %[c]}\n" \
" subne %[count], %[count], #4\n" \
/* Now we are 128-bit aligned */ \
" mov %[dummy1], %[c]\n" \
" mov %[dummy2], %[c]\n" \
"1:\n" /* Copy 4 32-bit values per loop iteration */ \
" subs %[count], %[count], #8\n" \
" stmgeia %[dst]!, {%[dummy0], %[dummy1], %[dummy2], %[c]}\n" \
" bge 1b\n" \
" add %[count], %[count], #8\n" \
"2:\n" /* Copy up to 3 remaining 32-bit values */ \
" tst %[count], #4\n" \
" stmneia %[dst]!, {%[dummy0], %[c]}\n" \
" tst %[count], #2\n" \
" strne %[c], [%[dst]], #4\n" \
" and %[count], %[count], #1\n" \
"3:\n" /* Copy up to 1 remaining 16-bit value */ \
" subs %[count], %[count], #1\n" \
" strgeh %[c], [%[dst]], #2\n" \
"\n" \
: [dst] "+&r" (dst), [count] "+&r" (count), [dummy0] "=&r" (dummy0), [dummy1] "=&r" (dummy1), [dummy2] "=&r" (dummy2), [c] "+&r" (c) \
: \
: "cc", "memory" \
); _dst;\
})
#define memcpy32(_dst, _src, _count) \
({ uint32_t *dst = (_dst); uint32_t *src = (_src); int count = (_count); \
__asm__ __volatile__ ( \
" cmp %[count], #4\n" \
" blt 2f\n" \
" tst %[dst], #4\n" \
" ldrne r4, [%[src]], #4\n" \
" strne r4, [%[dst]], #4\n" \
" subne %[count], %[count], #1\n" \
" tst %[dst], #8\n" \
" ldmneia %[src]!, {r4-r5}\n" \
" stmneia %[dst]!, {r4-r5}\n" \
" subne %[count], %[count], #2\n" \
"1:\n" \
" subs %[count], %[count], #4\n" \
" ldmgeia %[src]!, {r4-r7}\n" \
" stmgeia %[dst]!, {r4-r7}\n" \
" bge 1b\n" \
" add %[count], %[count], #4\n" \
"2:\n" \
" tst %[count], #2\n" \
" ldmneia %[src]!, {r4-r5}\n" \
" stmneia %[dst]!, {r4-r5}\n" \
" tst %[count], #1\n" \
" ldrne r4, [%[src]], #4\n" \
" strne r4, [%[dst]], #4\n" \
"\n" \
: [dst] "+&r" (dst), [src] "+&r" (src), [count] "+&r" (count) \
: \
: "r4", "r5", "r6", "r7", "cc", "memory" \
); _dst; \
})
#define memcpy16(_dst, _src, _count) \
({ uint16_t *dst = (_dst); uint16_t *src = (_src); int count = (_count); uint32_t dummy0; \
__asm__ __volatile__ ( \
" cmp %[count], #2\n" \
" blt 6f\n" \
/* Alignment is known to be at least 16-bit */ \
" tst %[dst], #2\n" \
" ldrneh r4, [%[src]], #2\n" \
" strneh r4, [%[dst]], #2\n" \
" subne %[count], %[count], #1\n" \
/* Now destination address is 32-bit aligned, still need to check whether */ \
/* source is 32-bit aligned or not */ \
" tst %[src], #2\n" \
" bne 3f\n" \
/* Both destination and source are 32-bit aligned */ \
" cmp %[count], #8\n" \
" blt 2f\n" \
" tst %[dst], #4\n" \
" ldrne r4, [%[src]], #4\n" \
" strne r4, [%[dst]], #4\n" \
" subne %[count], %[count], #2\n" \
" tst %[dst], #8\n" \
" ldmneia %[src]!, {r4-r5}\n" \
" stmneia %[dst]!, {r4-r5}\n" \
" subne %[count], %[count], #4\n" \
/* Destination address is 128-bit aligned, source address is 32-bit aligned */ \
"1: subs %[count], %[count], #8\n" \
" ldmgeia %[src]!, {r4-r7}\n" \
" stmgeia %[dst]!, {r4-r7}\n" \
" bge 1b\n" \
" add %[count], %[count], #8\n" \
/* Copy up to 3 remaining aligned 32-bit values */ \
"2: tst %[count], #4\n" \
" ldmneia %[src]!, {r4-r5}\n" \
" stmneia %[dst]!, {r4-r5}\n" \
" tst %[count], #2\n" \
" ldrne r4, [%[src]], #4\n" \
" strne r4, [%[dst]], #4\n" \
" and %[count], %[count], #1\n" \
" b 6f\n" \
/* Destination is 32-bit aligned, but source is only 16-bit aligned */ \
"3: cmp %[count], #8\n" \
" blt 5f\n" \
" tst %[dst], #4\n" \
" ldrneh r4, [%[src]], #2\n" \
" ldrneh r5, [%[src]], #2\n" \
" orrne r4, r4, r5, asl #16\n" \
" strne r4, [%[dst]], #4\n" \
" subne %[count], %[count], #2\n" \
" tst %[dst], #8\n" \
" ldrneh r4, [%[src]], #2\n" \
" ldrne r5, [%[src]], #4\n" \
" ldrneh r6, [%[src]], #2\n" \
" orrne r4, r4, r5, asl #16\n" \
" movne r5, r5, lsr #16\n" \
" orrne r5, r5, r6, asl #16\n" \
" stmneia %[dst]!, {r4-r5}\n" \
" subne %[count], %[count], #4\n" \
/* Destination is 128-bit aligned, but source is only 16-bit aligned */ \
"4: subs %[count], %[count], #8\n" \
" ldrgeh r4, [%[src]], #2\n" \
" ldmgeia %[src]!, {r5-r7}\n" \
" ldrgeh %[dummy0], [%[src]], #2\n" \
" orrge r4, r4, r5, asl #16\n" \
" movge r5, r5, lsr #16\n" \
" orrge r5, r5, r6, asl #16\n" \
" movge r6, r6, lsr #16\n" \
" orrge r6, r6, r7, asl #16\n" \
" movge r7, r7, lsr #16\n" \
" orrge r7, r7, %[dummy0], asl #16\n" \
" stmgeia %[dst]!, {r4-r7}\n" \
" bge 4b\n" \
" add %[count], %[count], #8\n" \
/* Copy up to 6 remaining 16-bit values (to 32-bit aligned destination) */ \
"5: subs %[count], %[count], #2\n" \
" ldrgeh r4, [%[src]], #2\n" \
" ldrgeh r5, [%[src]], #2\n" \
" orrge r4, r4, r5, asl #16\n" \
" strge r4, [%[dst]], #4\n" \
" bge 5b\n" \
" add %[count], %[count], #2\n" \
/* Copy the last remaining 16-bit value if any */ \
"6: subs %[count], %[count], #1\n" \
" ldrgeh r4, [%[src]], #2\n" \
" strgeh r4, [%[dst]], #2\n" \
"\n" \
: [dst] "+&r" (dst), [src] "+&r" (src), [count] "+&r" (count), [dummy0] "=&r" (dummy0) \
: \
: "r4", "r5", "r6", "r7", "cc", "memory" \
); _dst; \
})
#endif