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| author | Paolo Bonzini <pbonzini@redhat.com> | 2011-12-23 16:17:26 +0100 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2012-01-13 10:21:02 -0600 |
| commit | 8600361542d64572ad24e04bc25c1ac42000d6d6 (patch) | |
| tree | 39bce9f699a881a4aebb096b7cede1fa36d10e6f /arch_init.c | |
| parent | 1ba1f2e319afdcb485963cd3f426fdffd1b725f2 (diff) | |
| download | qemu-8600361542d64572ad24e04bc25c1ac42000d6d6.zip qemu-8600361542d64572ad24e04bc25c1ac42000d6d6.tar.gz qemu-8600361542d64572ad24e04bc25c1ac42000d6d6.tar.bz2 | |
vectorize is_dup_page
is_dup_page is already proceeding in 32-bit chunks. Changing it
to 16 bytes using Altivec or SSE is easy.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'arch_init.c')
| -rw-r--r-- | arch_init.c | 28 |
1 files changed, 22 insertions, 6 deletions
diff --git a/arch_init.c b/arch_init.c index 66f7a3f..95ac682 100644 --- a/arch_init.c +++ b/arch_init.c @@ -95,14 +95,30 @@ const uint32_t arch_type = QEMU_ARCH; #define RAM_SAVE_FLAG_EOS 0x10 #define RAM_SAVE_FLAG_CONTINUE 0x20 -static int is_dup_page(uint8_t *page, uint8_t ch) +#ifdef __ALTIVEC__ +#include <altivec.h> +#define VECTYPE vector unsigned char +#define SPLAT(p) vec_splat(vec_ld(0, p), 0) +#define ALL_EQ(v1, v2) vec_all_eq(v1, v2) +#elif defined __SSE2__ +#include <emmintrin.h> +#define VECTYPE __m128i +#define SPLAT(p) _mm_set1_epi8(*(p)) +#define ALL_EQ(v1, v2) (_mm_movemask_epi8(_mm_cmpeq_epi8(v1, v2)) == 0xFFFF) +#else +#define VECTYPE unsigned long +#define SPLAT(p) (*(p) * (~0UL / 255)) +#define ALL_EQ(v1, v2) ((v1) == (v2)) +#endif + +static int is_dup_page(uint8_t *page) { - uint32_t val = ch << 24 | ch << 16 | ch << 8 | ch; - uint32_t *array = (uint32_t *)page; + VECTYPE *p = (VECTYPE *)page; + VECTYPE val = SPLAT(page); int i; - for (i = 0; i < (TARGET_PAGE_SIZE / 4); i++) { - if (array[i] != val) { + for (i = 0; i < TARGET_PAGE_SIZE / sizeof(VECTYPE); i++) { + if (!ALL_EQ(val, p[i])) { return 0; } } @@ -134,7 +150,7 @@ static int ram_save_block(QEMUFile *f) p = memory_region_get_ram_ptr(mr) + offset; - if (is_dup_page(p, *p)) { + if (is_dup_page(p)) { qemu_put_be64(f, offset | cont | RAM_SAVE_FLAG_COMPRESS); if (!cont) { qemu_put_byte(f, strlen(block->idstr)); |