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Update dynamic target dispatch code to support AVX2.

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This commit is contained in:
Matt Pharr
2012-01-12 08:37:18 -08:00
parent 602209e5a8
commit 652215861e
1 changed files with 53 additions and 25 deletions
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78
builtins/dispatch.ll
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@@ -48,23 +48,42 @@ declare void @abort() noreturn
;; corresponding to one of the Target::ISA enumerant values that gives the
;; most capable ISA that the curremt system can run.
;;
;; #ifdef _MSC_VER
;; extern void __stdcall __cpuid(int info[4], int infoType);
;; #else
;; Note: clang from LLVM 2.9 should be used if this is updated, for maximum
;; backwards compatibility for anyone building ispc with LLVM 2.9.
;;
;; #include <stdint.h>
;; #include <stdlib.h>
;;
;; static void __cpuid(int info[4], int infoType) {
;; __asm__ __volatile__ ("cpuid"
;; : "=a" (info[0]), "=b" (info[1]), "=c" (info[2]), "=d" (info[3])
;; : "0" (infoType));
;; }
;; #endif
;;
;; /* Save %ebx in case it's the PIC register */
;; static void __cpuid_count(int info[4], int level, int count) {
;; __asm__ __volatile__ ("xchg{l}\t{%%}ebx, %1\n\t"
;; "cpuid\n\t"
;; "xchg{l}\t{%%}ebx, %1\n\t"
;; : "=a" (info[0]), "=r" (info[1]), "=c" (info[2]), "=d" (info[3])
;; : "0" (level), "2" (count));
;; }
;;
;; int32_t __get_system_isa() {
;; int info[4];
;; __cpuid(info, 1);
;;
;; /* NOTE: the values returned below must be the same as the
;; corresponding enumerant values in Target::ISA. */
;; if ((info[2] & (1 << 28)) != 0)
;; return 2; // AVX
;; if ((info[2] & (1 << 28)) != 0) {
;; // AVX1 for sure. Do we have AVX2?
;; // Call cpuid with eax=7, ecx=0
;; __cpuid_count(info, 7, 0);
;; if ((info[1] & (1 << 5)) != 0)
;; return 3; // AVX2
;; else
;; return 2; // AVX1
;; }
;; else if ((info[2] & (1 << 19)) != 0)
;; return 1; // SSE4
;; else if ((info[3] & (1 << 26)) != 0)
@@ -76,33 +95,42 @@ declare void @abort() noreturn
%0 = type { i32, i32, i32, i32 }
define i32 @__get_system_isa() nounwind ssp {
%1 = tail call %0 asm sideeffect "cpuid", "={ax},={bx},={cx},={dx},0,~{dirflag},~{fpsr},~{flags}"(i32 1) nounwind
%2 = extractvalue %0 %1, 2
%3 = extractvalue %0 %1, 3
%4 = and i32 %2, 268435456
%5 = icmp eq i32 %4, 0
br i1 %5, label %6, label %13
entry:
%0 = tail call %0 asm sideeffect "cpuid", "={ax},={bx},={cx},={dx},0,~{dirflag},~{fpsr},~{flags}"(i32 1) nounwind
%asmresult9.i = extractvalue %0 %0, 2
%asmresult10.i = extractvalue %0 %0, 3
%and = and i32 %asmresult9.i, 268435456
%cmp = icmp eq i32 %and, 0
br i1 %cmp, label %if.else7, label %if.then
; <label>:6 ; preds = %0
%7 = and i32 %2, 524288
%8 = icmp eq i32 %7, 0
br i1 %8, label %9, label %13
if.then: ; preds = %entry
%1 = tail call %0 asm sideeffect "xchg$(l$)\09$(%$)ebx, $1\0A\09cpuid\0A\09xchg$(l$)\09$(%$)ebx, $1\0A\09", "={ax},=r,={cx},={dx},0,2,~{dirflag},~{fpsr},~{flags}"(i32 7, i32 0) nounwind
%asmresult9.i24 = extractvalue %0 %1, 1
%and4 = lshr i32 %asmresult9.i24, 5
%2 = and i32 %and4, 1
%3 = or i32 %2, 2
br label %return
; <label>:9 ; preds = %6
%10 = and i32 %3, 67108864
%11 = icmp eq i32 %10, 0
br i1 %11, label %12, label %13
if.else7: ; preds = %entry
%and10 = and i32 %asmresult9.i, 524288
%cmp11 = icmp eq i32 %and10, 0
br i1 %cmp11, label %if.else13, label %return
; <label>:12 ; preds = %9
if.else13: ; preds = %if.else7
%and16 = and i32 %asmresult10.i, 67108864
%cmp17 = icmp eq i32 %and16, 0
br i1 %cmp17, label %if.else19, label %return
if.else19: ; preds = %if.else13
tail call void @abort() noreturn nounwind
unreachable
; <label>:13 ; preds = %9, %6, %0
%.0 = phi i32 [ 2, %0 ], [ 1, %6 ], [ 0, %9 ]
ret i32 %.0
return: ; preds = %if.else13, %if.else7, %if.then
%retval.0 = phi i32 [ %3, %if.then ], [ 1, %if.else7 ], [ 0, %if.else13 ]
ret i32 %retval.0
}
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; This function is called by each of the dispatch functions we generate;
;; it sets @__system_best_isa if it is unset.