GCC: obtaining asm + source

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thellier

Posted on: 2019/5/22 10:05 #1

Not too shy to talk

Hello

I was used to do that (on classic 68k) to obtain an asm source from a C sources that is mixed with the original C source

gcc -noixemul -O3 -S fillpoly.c
gcc -Wa,-adhln -g -noixemul -O3 -c fillpoly.c > fillpoly-mixed.c

So I can read the C instruction and how it was converted to asm

But this syntax dont seems to works for GCC/ppc/OS4
Do you know a gcc version that still support this ?

Thanks

For information it was giving a "mixed" source like that

271:fillpoly.c **** Frag[1].L.u=Frag->L.u + du;
1209 .stabd 68,0,271
1210 039a 2428 000C movel a0@(12),d2
1211 039e D48C addl a4,d2
1212 03a0 2142 003C movel d2,a0@(60)

272:fillpoly.c **** Frag[1].L.v=Frag->L.v + dv;
1213 .stabd 68,0,272
1214 03a4 2428 0010 movel a0@(16),d2
1215 03a8 D487 addl d7,d2
1216 03aa 2142 0040 movel d2,a0@(64)

broadblues

Re: GCC: obtaining asm + source

Posted on: 2019/5/22 10:15 #2

Home away from home

Actuall seems to work here.

test.c


int foobar()

{

    int foo = 8;

    int bar = 9;

    

    return foo + bar;

}

gcc -Wa,-adhln -g -O3 -c test.c > test-mixed.c


1                      .file    "test.c"

   9                  .Ltext0:

  10                      .align 2

  11                      .globl foobar

  13                  foobar:

  14                  .LFB2:

  15                      .file 1 "test.c"

   1:test.c        **** int foobar()

   2:test.c        **** {

  16                      .loc 1 2 0

   3:test.c        ****     int foo = 8;

   4:test.c        ****     int bar = 9;

   5:test.c        ****     

   6:test.c        ****     return foo + bar;

   7:test.c        **** }

  17                      .loc 1 7 0

  18 0000 38600011         li %r3,17

  19 0004 4E800020         blr

  20                  .LFE2:

  46                  .Letext0:

Or is that not what you expect?

[edit]
My exsmple was abit trivial so the optimiser removed most of the code with no optrimsiation you get


1                      .file    "test.c"

   9                  .Ltext0:

  10                      .align 2

  11                      .globl foobar

  13                  foobar:

  14                  .LFB2:

  15                      .file 1 "test.c"

   1:test.c        **** int foobar()

   2:test.c        **** {

  16                      .loc 1 2 0

  17 0000 9421FFE0         stwu %r1,-32(%r1)

  18                  .LCFI0:

  19 0004 93E1001C         stw %r31,28(%r1)

  20                  .LCFI1:

  21 0008 7C3F0B78         mr %r31,%r1

  22                  .LCFI2:

   3:test.c        ****     int foo = 8;

  23                      .loc 1 3 0

  24 000c 38000008         li %r0,8

  25 0010 901F000C         stw %r0,12(%r31)

   4:test.c        ****     int bar = 9;

  26                      .loc 1 4 0

  27 0014 38000009         li %r0,9

  28 0018 901F0008         stw %r0,8(%r31)

   5:test.c        ****     

   6:test.c        ****     return foo + bar;

  29                      .loc 1 6 0

  30 001c 813F000C         lwz %r9,12(%r31)

  31 0020 801F0008         lwz %r0,8(%r31)

  32 0024 7C090214         add %r0,%r9,%r0

   7:test.c        **** }

  33                      .loc 1 7 0

  34 0028 7C030378         mr %r3,%r0

  35 002c 81610000         lwz %r11,0(%r1)

  36 0030 83EBFFFC         lwz %r31,-4(%r11)

  37 0034 7D615B78         mr %r1,%r11

  38 0038 4E800020         blr

  39                  .LFE2:

  77                  .Letext0:

This was with gcc 4.2.4 from the SDK.

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broadblues

Re: GCC: obtaining asm + source

Posted on: 2019/5/22 10:23 #3

Home away from home

Also worked with GCC 5.4.0

Blender For OS4.x : Blues : Walker Broad

thellier

Re: GCC: obtaining asm + source

Posted on: 2019/5/22 14:54 #4

Not too shy to talk

So it works too
Thanks

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