diff options
Diffstat (limited to 'inlineasm.h')
| -rw-r--r-- | inlineasm.h | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/inlineasm.h b/inlineasm.h index af466d3..fc048ca 100644 --- a/inlineasm.h +++ b/inlineasm.h @@ -26,7 +26,7 @@ static uint64_t rdtsc() "rdtsc ;" : "=A" (rdtsc) ); - + return rdtsc; } @@ -42,12 +42,12 @@ static uint64_t memmeasure(char* memory, uint64_t offset) "shl $32, %%rdx ;" "add %%rax, %%rdx ;" "mov %%rdx, %%rdi ;" - + // here be magic dragons and memory access (read segfaults) ahead - // TODO: evaluate if more cmp types (like w and l) do make sense + // TODO: evaluate if more cmp types (like w and l) do make sense "cmpb $0x23, (%%rbx) ;" "cmpb $0x42, (%%rbx,%%rcx) ;" - + "rdtsc ;" "shl $32, %%rdx ;" "add %%rdx, %%rax ;" @@ -55,7 +55,7 @@ static uint64_t memmeasure(char* memory, uint64_t offset) : : "b" (memory), "c" (offset) ); } - + // this implementation only uses the lower part of the values retured by // rdtsc to save instrucions. it is not significantly faster than the // accurate one but it has fewer instrucions and by that is less likely @@ -66,12 +66,12 @@ static uint64_t optmemmeasure(char* memory, uint64_t offset) asm( "rdtsc ;" "mov %%eax, %%edi ;" - + // here be magic dragons and memory access (read segfaults) ahead - // TODO: evaluate if more cmp types (like w and l) do make sense + // TODO: evaluate if more cmp types (like w and l) do make sense "cmpb $0x23, (%%rbx) ;" "cmpb $0x42, (%%rbx,%%rcx) ;" - + "rdtsc ;" "sub %%edi, %%eax ;" : : "b" (memory), "c" (offset) |