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re PR target/47192 (m68k target - gcc uses stack frame after it has been unlinked when compiling with -Os)

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PR target/47192
	* config/m68k/m68k.c (m68k_expand_epilogue): Emit a scheduling
	barrier prior to deallocating the stack.

	PR target/47192
	* gcc.target/m68k/pr47192.c: New test.

From-SVN: r242575
This commit is contained in:
Jeff Law 2016-11-17 16:39:08 -07:00 • committed by Jeff Law
parent e080b2818b
commit f2b6aad987
4 changed files with 49 additions and 0 deletions
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6
gcc/ChangeLog
View file

@ -1,3 +1,9 @@
2016-11-17 Jeff Law <law@redhat.com>
PR target/47192
* config/m68k/m68k.c (m68k_expand_epilogue): Emit a scheduling
barrier prior to deallocating the stack.
2016-11-17 Andrew Burgess <andrew.burgess@embecosm.com>
* config/arc/arc.md (cmem bit/sign-extend peephole2): New peephole

2
gcc/config/m68k/m68k.c
View file

@ -1205,6 +1205,7 @@ m68k_expand_epilogue (bool sibcall_p)
stack-based restore. */
emit_move_insn (gen_rtx_REG (Pmode, A1_REG),
GEN_INT (-(current_frame.offset + fsize)));
emit_insn (gen_blockage ());
emit_insn (gen_addsi3 (stack_pointer_rtx,
gen_rtx_REG (Pmode, A1_REG),
frame_pointer_rtx));
@ -1306,6 +1307,7 @@ m68k_expand_epilogue (bool sibcall_p)
current_frame.fpu_mask, false, false);
}
emit_insn (gen_blockage ());
if (frame_pointer_needed)
emit_insn (gen_unlink (frame_pointer_rtx));
else if (fsize_with_regs)

5
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,8 @@
2016-11-17 Jeff Law <law@redhat.com>
PR target/47192
* gcc.target/m68k/pr47192.c: New test.
2016-11-17 Toma Tabacu <toma.tabacu@imgtec.com>
* gcc.target/mips/branch-cost-1.c (dg-options): Use (HAS_MOVN)

36
gcc/testsuite/gcc.target/m68k/pr47192.c Normal file
View file

@ -0,0 +1,36 @@
/* { dg-do compile } */
/* { dg-options "-O2 -mcpu=51qe -fdisable-ipa-pure-const -fdump-rtl-pro_and_epilogue" } */
/* { dg-final { scan-rtl-dump-times "unspec_volatile" 1 "pro_and_epilogue"} } */
char F(short *ty);
short V(char cmd)
{
static short st256;
static short stc;
short sc;
short scd;
short d;
F(&sc);
if (cmd == 4)
{
st256 = 0;
d = 0;
}
else
{
scd = sc - stc;
if (scd < -128)
{
scd += 256;
}
d = st256 >> 8;
st256 -= d << 8;
}
stc = sc;
return d;
}