https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55212
--- Comment #248 from Kazumoto Kojima <kkojima at gcc dot gnu.org> --- Created attachment 59102 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59102&action=edit a reduced C test case for the wrong code problem c#192 typedef struct { int c[64]; } obj; extern void bar (int, int, int, int, obj *); void foo (obj *p) { obj bobj = *p; bar (0, 0, 0, 0, &bobj); } With "-O2 -m4 -mlra -ffixed-r7 -ffixed-r8 -ffixed-r9 -ffixed-r10 -ffixed-r11 -ffixed-r12 -ffixed-r13", it's compiled to foo: mov.l r14,@-r15 ! 32 [c=4 l=2] movsi_ie/8 mov r4,r5 ! 23 [c=4 l=2] movsi_ie/1 sts.l pr,@-r15 ! 33 [c=4 l=2] movsi_ie/10 mov.w .L6,r1 ! 34 [c=10 l=2] *movhi/0 mov #31,r6 ! 11 [c=4 l=2] movsi_ie/2 mov.l .L4,r14 ! 29 [c=10 l=2] movsi_ie/0 mov #0,r7 ! 16 [c=4 l=2] movsi_ie/2 sub r1,r15 ! 35 [c=4 l=2] *subsi3_internal mov r15,r4 ! 30 [c=4 l=2] movsi_ie/1 jsr @r14 ! 12 [c=1 l=2] block_lump_real_i4/0 add #4,r4 ! 31 [c=4 l=2] *addsi3_compact_lra/0 mov.l .L5,r1 ! 27 [c=10 l=2] movsi_ie/0 mov #0,r6 ! 17 [c=4 l=2] movsi_ie/2 mov.l r4,@r15 ! 14 [c=4 l=2] movsi_ie/8 mov #0,r5 ! 18 [c=4 l=2] movsi_ie/2 jsr @r1 ! 20 [c=0 l=2] calli mov #0,r4 ! 19 [c=4 l=2] movsi_ie/2 r4 clobbered by block_lump_real_i4 is wrongly used as the 5-th argument of the bar function. ffixed-reg options are used to make register starvation.
