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Add clock() function to standard library.

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Also corrected the declaration of num_cores() to return a
uniform value.
This commit is contained in:
Matt Pharr
2012-01-22 13:05:27 -08:00
parent 1f0f2ec05f
commit d805e8b183
3 changed files with 39 additions and 4 deletions
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16
builtins/util.m4
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@@ -1811,6 +1811,22 @@ ok:
ret void
}
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; read hw clock
define i64 @__clock() nounwind uwtable ssp {
entry:
tail call void asm sideeffect "xorl %eax,%eax \0A cpuid", "~{rax},~{rbx},~{rcx},~{rdx},~{dirflag},~{fpsr},~{flags}"() nounwind
%0 = tail call { i32, i32 } asm sideeffect "rdtsc", "={ax},={dx},~{dirflag},~{fpsr},~{flags}"() nounwind
%asmresult = extractvalue { i32, i32 } %0, 0
%asmresult1 = extractvalue { i32, i32 } %0, 1
%conv = zext i32 %asmresult1 to i64
%shl = shl nuw i64 %conv, 32
%conv2 = zext i32 %asmresult to i64
%or = or i64 %shl, %conv2
ret i64 %or
}
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; stdlib transcendentals
;;