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2012 May 24
4
[LLVMdev] use AVX automatically if present
I wonder why AVX is not used automatically if available at the host
machine. In contrast to that, SSE41 instructions (like pmulld) are
automatically used if the host machine supports SSE41.
E.g.
$ cat avx.ll
define void @_fun1(<8 x float>*, <8 x float>*) {
_L1:
%x = load <8 x float>* %0
%y = load <8 x float>* %1
%z = fadd <8 x float> %x, %y
store <8 x float> %z, <8 x float>* %0
ret void
}
$ llc -o - avx.ll
.file "avx.ll"
.text...
2012 May 24
0
[LLVMdev] use AVX automatically if present
...ent LLVM-3.1 and in principle my
llc knows about avx as I have shown in the second example. But avx does
not seem to be used by default.
On Thu, 24 May 2012, Henning Thielemann wrote:
> $ llc -o - -mattr avx avx.ll
> .file "avx.ll"
> .text
> .globl _fun1
> .align 16, 0x90
> .type _fun1, at function
> _fun1: # @_fun1
> .cfi_startproc
> # BB#0: # %_L1
> pushq %rbp
> .Ltmp2:
> .cfi_def_cfa_offset 16
> .Ltmp3:
>...
2012 May 24
2
[LLVMdev] use AVX automatically if present
...about avx as I have shown in the second example. But avx
> does not seem to be used by default.
>
>
> On Thu, 24 May 2012, Henning Thielemann wrote:
>
> > $ llc -o - -mattr avx avx.ll
> > .file "avx.ll"
> > .text
> > .globl _fun1
> > .align 16, 0x90
> > .type _fun1, at function
> > _fun1: # @_fun1
> > .cfi_startproc
> > # BB#0: # %_L1
> > pushq %rbp
> > .Ltmp2:
> > .cfi_def...