Viewing file:  alias_bug.c (1.13 KB) -rw-r--r--
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/* { dg-do compile } */
/* { dg-options "-O2 -fno-strict-aliasing -fdump-tree-optimized" } */
typedef unsigned u32;
typedef unsigned short u16;
typedef unsigned char u8;
struct biosregs {
union {
struct {
u32 edi;
u32 esi;
u32 ebp;
u32 _esp;
u32 ebx;
u32 edx;
u32 ecx;
u32 eax;
u32 _fsgs;
u32 _dses;
u32 eflags;
};
struct {
u16 di, hdi;
u16 si, hsi;
u16 bp, hbp;
u16 _sp, _hsp;
u16 bx, hbx;
u16 dx, hdx;
u16 cx, hcx;
u16 ax, hax;
u16 gs, fs;
u16 es, ds;
u16 flags, hflags;
};
struct {
u8 dil, dih, edi2, edi3;
u8 sil, sih, esi2, esi3;
u8 bpl, bph, ebp2, ebp3;
u8 _spl, _sph, _esp2, _esp3;
u8 bl, bh, ebx2, ebx3;
u8 dl, dh, edx2, edx3;
u8 cl, ch, ecx2, ecx3;
u8 al, ah, eax2, eax3;
};
};
};
void initregs(struct biosregs *regs);
void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg);
static u32 *const gp = (u32*) 0x32;
void keyboard_set_repeat(void)
{
struct biosregs ireg;
*gp = 10;
initregs(&ireg);
ireg.ax = 0x0305;
intcall(0x16, &ireg, ((void *)0));
}
/* { dg-final { scan-tree-dump-times "ireg.*ax" 1 "optimized"} } */
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