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Date: Thu, 28 Feb 2019 12:07:36 +1100 (AEDT)
From: Damian McGuckin <damianm@....com.au>
To: musl@...ts.openwall.com
Subject: Re: FE Exception triggered by comparison
On Wed, 27 Feb 2019, Markus Wichmann wrote:
> On Thu, Feb 28, 2019 at 03:09:54AM +1100, Damian McGuckin wrote:
>> .ident "GCC: (GNU) 4.8.5 20150623 (Red Hat 4.8.5-36)"
>
> You might want to consider upgrading:
Done. But the subroutine call is still hanging around. What am I doing
wrong.
Yours is:
> .globl main
> .type main, @function
> main:
> .LFB17:
> .cfi_startproc
> pxor %xmm0, %xmm0
> subq $8, %rsp
> .cfi_def_cfa_offset 16
> movabsq $9218868437227405312, %rdx
> divsd %xmm0, %xmm0
> leaq .LC0(%rip), %rsi
> leaq .LC3(%rip), %rdi
> movq %xmm0, %rax
> btrq $63, %rax
> cmpq %rdx, %rax
> leaq .LC1(%rip), %rax
> cmovbe %rax, %rsi
> xorl %eax, %eax
> call printf@PLT
> xorl %eax, %eax
> addq $8, %rsp
> .cfi_def_cfa_offset 8
> ret
> .cfi_endproc
> .LFE17:
> .size main, .-main
> .ident "GCC: (Debian 8.2.0-14) 8.2.0"
> .section .note.GNU-stack,"",@progbits
>
> That sufficiently efficient for you?
It would be if I could achieve it. What options do I need? I use
gcc -S -O3 -msse4.2 -mfma mynan.c
See below:
.file "mynan.c"
.text
.section .rodata.str1.1,"aMS",@progbits,1
.LC0:
.string "yes"
.LC1:
.string "no!"
.LC3:
.string "what %s\n"
.section .text.startup,"ax",@progbits
.p2align 4,,15
.globl main
.type main, @function
main:
.LFB14:
.cfi_startproc
vxorpd %xmm0, %xmm0, %xmm0
subq $8, %rsp
.cfi_def_cfa_offset 16
vdivsd %xmm0, %xmm0, %xmm0
call __isnan
movl $.LC0, %esi
movl $.LC3, %edi
testl %eax, %eax
movl $.LC1, %eax
cmove %rax, %rsi
xorl %eax, %eax
call printf
xorl %eax, %eax
addq $8, %rsp
.cfi_def_cfa_offset 8
ret
.cfi_endproc
.LFE14:
.size main, .-main
.ident "GCC: (GNU) 8.2.1 20180905 (Red Hat 8.2.1-3)"
.section .note.GNU-stack,"",@progbits
It is the standard package with devtools-8 under CentOS.
Thanks - Damian
Pacific Engineering Systems International, 277-279 Broadway, Glebe NSW 2037
Ph:+61-2-8571-0847 .. Fx:+61-2-9692-9623 | unsolicited email not wanted here
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