On Tue, Sep 05, 2023 at 09:31:56PM +0800, Xi Ruoyao wrote:
> On Thu, 2023-08-31 at 20:48 +0800, Yang Yujie wrote:
> > * Support options for LoongArch SIMD extensions:
> > new configure options --with-simd={none,lsx,lasx};
> > new compiler option -msimd={none,lsx,lasx};
> > new driver options -m[no]-l[a]sx.
>
> Hmm... In my build (a cross compiler configured with ../gcc/configure --
> target=loongarch64-linux-gnu --with-system-zlib) I have:
>
> $ cat lasx.c
> int x __attribute__((vector_size(32)));
> int y __attribute__((vector_size(32)));
> void test(void) { x += y; }
> $ gcc/cc1 lasx.c -msimd=lasx -o- -nostdinc -mexplicit-relocs -O2
>
> ... ...
>
> pcalau12i $r12,%pc_hi20(.LANCHOR0)
> addi.d $r12,$r12,%pc_lo12(.LANCHOR0)
> xvld $xr0,$r12,0
> xvld $xr1,$r12,32
> xvadd.w $xr0,$xr0,$xr1
> xvst $xr0,$r12,0
> jr $r1
>
> ... ...
>
> This seems perfectly fine. But:
>
> $ gcc/xgcc -B gcc lasx.c -mlasx -o- -nostdinc -mexplicit-relocs -O2 -S
>
> ... ...
>
> test:
> .LFB0 = .
> pcalau12i $r12,%pc_hi20(.LANCHOR0)
> addi.d $r12,$r12,%pc_lo12(.LANCHOR0)
> addi.d $r3,$r3,-16
> .LCFI0 = .
> st.d $r23,$r3,8
> .LCFI1 = .
> ldptr.w $r7,$r12,0
> ldptr.w $r23,$r12,32
> ldptr.w $r6,$r12,8
>
> ... ... (no SIMD instructions)
>
> Is this a bug in the driver or I missed something?
>
> --
> Xi Ruoyao <xry...@xry111.site>
> School of Aerospace Science and Technology, Xidian University
Maybe you can try deleting gcc/specs first.
It contains a modified version of self_specs that is used for building
the libraries, which purges all user-specified "-m" options.
This file is automatically restored prior to "make check*".
Yujie
