[Bug tree-optimization/49094] ARM aligned(1) attribute is sometimes dropped

[sgh at sgh dot dk]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49094

Søren Holm <sgh at sgh dot dk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sgh at sgh dot dk

--- Comment #11 from Søren Holm <sgh at sgh dot dk> 2011-07-30 12:13:56 UTC ---
tst2.c also fails with an alignment related problem. I'm unsue if this should
be reported in another bug.

With "static" on line 33 the code generated is this :

<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
unsigned int aostk_font_strwidth(const struct aostk_font* font, const char*
str) {
        const struct aostk_glyph* g = aostk_get_glyph(font, 0);
        return g->advance.x;
   0:   e5903003        ldr     r3, [r0, #3]
}
   4:   e5d30005        ldrb    r0, [r3, #5]
   8:   e12fff1e        bx      lr
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

The first ldr-instruction is wrong afaik sinct struct aostk_font is packed.

Removing "static" fomr line 33 gives this code :

<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
const struct aostk_glyph* aostk_get_glyph(const struct aostk_font* f, unsigned
int c) {
        return &f->glyphs[0];
   0:   e5d02004        ldrb    r2, [r0, #4]
   4:   e5d03003        ldrb    r3, [r0, #3]
   8:   e1833402        orr     r3, r3, r2, lsl #8
   c:   e5d02005        ldrb    r2, [r0, #5]
  10:   e5d00006        ldrb    r0, [r0, #6]
  14:   e1833802        orr     r3, r3, r2, lsl #16
}
  18:   e1830c00        orr     r0, r3, r0, lsl #24
  1c:   e12fff1e        bx      lr

00000020 <aostk_font_strwidth>:
        const struct aostk_glyph* glyphs;
};


const struct aostk_glyph* aostk_get_glyph(const struct aostk_font* f, unsigned
int c) {
        return &f->glyphs[0];
  20:   e5d02004        ldrb    r2, [r0, #4]
  24:   e5d03003        ldrb    r3, [r0, #3]
  28:   e1833402        orr     r3, r3, r2, lsl #8
  2c:   e5d02005        ldrb    r2, [r0, #5]
  30:   e1833802        orr     r3, r3, r2, lsl #16
  34:   e5d02006        ldrb    r2, [r0, #6]
  38:   e1833c02        orr     r3, r3, r2, lsl #24


unsigned int aostk_font_strwidth(const struct aostk_font* font, const char*
str) {
        const struct aostk_glyph* g = aostk_get_glyph(font, 0);
        return g->advance.x;
}
  3c:   e5d30005        ldrb    r0, [r3, #5]
  40:   e12fff1e        bx      lr
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Notice in aostk_get_glyph that the ldrb-instructions are used instead of ldr.