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Re: To Melzzzzz

Cross-posted to 2 groups.

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On Sun, 29 Jun 2014 10:47:51 -0700
Ramine <ramine@1.1> wrote:

> 
> Hello,
> 
> Look for example at the assembler source code of
> SparseCompRow.c that you will find inside the
> scimark2 source code benchmark, look carefully
> at the follwing assembler code, and you will notice
> that it is auto-vectorizing, i am using just using
> -O1 level optimization and the -S flag to generate
> the assembler code, here it is:
> 
> 
> ===
> 
> 
> .file	"SparseCompRow.c"
> 	.text
> 	.globl	SparseCompRow_num_flops
> 	.def	SparseCompRow_num_flops;	.scl
> 2;	.type	32;	.endef .seh_proc
> SparseCompRow_num_flops SparseCompRow_num_flops:
> 	.seh_endprologue
> 	movl	%edx, %eax
> 	sarl	$31, %edx
> 	idivl	%ecx
> 	imull	%eax, %ecx
> 	cvtsi2sd	%ecx, %xmm0
> 	addsd	%xmm0, %xmm0
> 	cvtsi2sd	%r8d, %xmm1
> 	mulsd	%xmm1, %xmm0
> 	ret
> 	.seh_endproc
> 	.globl	SparseCompRow_matmult
> 	.def	SparseCompRow_matmult;	.scl
> 2;	.type	32;	.endef .seh_proc
> SparseCompRow_matmult SparseCompRow_matmult:
> 	pushq	%r13
> 	.seh_pushreg	%r13
> 	pushq	%r12
> 	.seh_pushreg	%r12
> 	pushq	%rbp
> 	.seh_pushreg	%rbp
> 	pushq	%rdi
> 	.seh_pushreg	%rdi
> 	pushq	%rsi
> 	.seh_pushreg	%rsi
> 	pushq	%rbx
> 	.seh_pushreg	%rbx
> 	.seh_endprologue
> 	movl	%ecx, %edi
> 	movq	%rdx, %rbp
> 	movq	%r8, %rdx
> 	movq	%r9, %rsi
> 	movq	88(%rsp), %r9
> 	movq	96(%rsp), %rcx
> 	movl	104(%rsp), %r13d
> 	movl	$0, %r12d
> 	xorpd	%xmm2, %xmm2
> 	movapd	%xmm2, %xmm3
> 	testl	%r13d, %r13d
> 	jg	.L15
> 	jmp	.L2
> .L12:
> 	movl	(%rsi,%rbx,4), %eax
> 	movl	4(%rsi,%rbx,4), %r8d
> 	cmpl	%r8d, %eax
> 	jge	.L10
> 	movapd	%xmm2, %xmm0
> .L6:
> 	movslq	%eax, %r10
> 	movslq	(%r9,%r10,4), %r11
> 	movsd	(%rcx,%r11,8), %xmm1
> 	mulsd	(%rdx,%r10,8), %xmm1
> 	addsd	%xmm1, %xmm0
> 	addl	$1, %eax
> 	cmpl	%r8d, %eax
> 	jne	.L6
> 	jmp	.L5
> .L10:
> 	movapd	%xmm3, %xmm0
> .L5:
> 	movsd	%xmm0, 0(%rbp,%rbx,8)
> 	addq	$1, %rbx
> 	cmpl	%ebx, %edi
> 	jg	.L12
> .L8:
> 	addl	$1, %r12d
> 	cmpl	%r13d, %r12d
> 	jne	.L15
> 	jmp	.L2
> .L15:
> 	movl	$0, %ebx
> 	testl	%edi, %edi
> 	jg	.L12
> 	.p2align 4,,4
> 	jmp	.L8
> .L2:
> 	popq	%rbx
> 	popq	%rsi
> 	popq	%rdi
> 	popq	%rbp
> 	popq	%r12
> 	popq	%r13
> 	ret
> 	.seh_endproc
> 
> ==

No this is just scalar code. It does not use mulpd/addpd rather
mulsd/addsd.
It is scalar instruction for simd.



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To Melzzzzz Ramine <ramine@1.1> - 2014-06-28 15:51 -0700
  Re: To Melzzzzz Melzzzzz <mel@zzzzz.invalid> - 2014-06-29 04:10 +0200
    Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 10:33 -0700
      Re: To Melzzzzz Melzzzzz <mel@zzzzz.com> - 2014-06-29 16:39 +0200
        Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 10:47 -0700
          Re: To Melzzzzz Melzzzzz <mel@zzzzz.com> - 2014-06-29 17:00 +0200
            Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 11:14 -0700
              Re: To Melzzzzz Melzzzzz <mel@zzzzz.com> - 2014-06-29 17:20 +0200
              Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 11:23 -0700
                Re: To Melzzzzz Melzzzzz <mel@zzzzz.com> - 2014-06-29 17:31 +0200
                Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 11:32 -0700
                Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 11:38 -0700
    Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 10:41 -0700
      Re: To Melzzzzz Melzzzzz <mel@zzzzz.invalid> - 2014-06-29 16:46 +0200
        Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 10:54 -0700

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