Initial import.

git-svn-id: svn://mattst88.com/svn/x86_64-assembly/trunk@1 a323887f-d61c-418c-83a5-2e06a2a01087

1 files changed, 67 insertions, 0 deletions

diff --git a/benchmark.asm b/benchmark.asm
new file mode 100644
index 0000000..e45848e
--- /dev/null
+++ b/benchmark.asm
@@ -0,0 +1,67 @@
+format ELF64
+
+extrn	printf
+extrn	puts
+extrn	scanf
+public	main
+
+section '.text' executable
+
+main:
+	push	rbp
+	mov	rbp,rsp
+
+        finit
+
+        ; to determine how many clocks it takes to count clocks
+        cpuid                   ; force all previous instructions to complete
+        rdtsc                   ; read time stamp counter
+        shl     rdx,32          ; shift rdx left 32 places
+        or      rax,rdx         ; timestamp in rax
+        mov     r11,rax         ; r11 stores the first timestamp
+        
+        ; get the second timestamp
+        cpuid                   ; force all previous instructions to complete
+        rdtsc                   ; read time stamp counter
+        shl     rdx,32          ; shift rdx left 32 places
+        or      rax,rdx         ; timestamp in rax
+
+        sub     rax,r11         ; get difference in timestamps
+        mov     r11,rax         ; r11 stores clocks required to count clocks
+
+        ; begin benchmarking
+        cpuid
+        rdtsc
+        shl     rdx,32
+        or      rax,rdx
+        mov     r10,rax         ; r10 stores first timestamp
+
+        ; code to benchmark goes here
+        nop
+        nop
+
+        ; end code to benchmark
+
+        ; end benchmarking, take timestamp
+        cpuid
+        rdtsc
+        shl     rdx,32
+        or      rax,rdx         ; rax stores second timestamp
+
+        sub     rax,r10         ; get difference in timestamps
+        sub     rax,r11         ; subtract out time to count clocks
+
+        ; print results
+        mov     rsi,rax         ; rsi is first argument (the number of clocks)
+        mov     edi,msg         ; rdi is second argument (location of msg)
+        xor     eax,eax         ; eax = 0 (number of floating point arguments)
+        call    printf          ; call printf and print results
+
+	leave
+	ret
+
+section '.data' writable align 16
+
+msg     db      "%lu clock cycles",0xA,0
+
+