https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106418
Bug ID: 106418
Summary: '-fcompare-debug' failure w/ -mcpu=e500mc -O2
-fnon-call-exceptions -fsched-stalled-insns
-fno-reorder-blocks -fno-thread-jumps -fno-tree-dce
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Keywords: compare-debug-failure
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
Target: powerpc-e300c3-linux-gnu
gcc 13.0.0 20220717 snapshot (g:7bcd7f47359b903bf7a193b95d4450d9d69c60ba) fails
-fcompare-debug check when compiling the following testcase w/ -mcpu=e500mc -O2
-fcompare-debug -fnon-call-exceptions -fsched-stalled-insns -fno-reorder-blocks
-fno-thread-jumps -fno-tree-dce:
int n;
__attribute__ ((noinline)) int
return_zero (void)
{
return 0;
}
__attribute__ ((noinline)) int
return_one (void)
{
return 1;
}
__attribute__ ((noinline)) void
empty (int)
{
}
int
foo (int x)
{
if (x)
empty (n);
else if (return_zero () == n)
empty (return_one ());
return 0;
}
% powerpc-e300c3-linux-gnu-gcc-13.0.0 -mcpu=e500mc -O2 -fcompare-debug
-fnon-call-exceptions -fsched-stalled-insns -fno-reorder-blocks
-fno-thread-jumps -fno-tree-dce -c vjbxa62g.c
powerpc-e300c3-linux-gnu-gcc-13.0.0: error: vjbxa62g.c: '-fcompare-debug'
failure
gkd diff:
--- vjbxa62g.c.gkd 2022-07-23 13:54:24.325382258 +0700
+++ vjbxa62g.gk.c.gkd 2022-07-23 13:54:24.350381830 +0700
@@ -188,22 +188,17 @@
(insn:TI # 0 0 (set (reg/i:SI 3 3)
(const_int 0 [0])) "vjbxa62g.c":29:1# {*movsi_internal1}
(nil))
-(insn # 0 0 (unspec_volatile [
+(insn:TI # 0 0 (unspec_volatile [
(const_int 0 [0])
] UNSPECV_BLOCK) "vjbxa62g.c":29:1# {blockage}
(nil))
+(insn # 0 0 (use (reg/i:SI 3 3)) "vjbxa62g.c":29:1#
+ (nil))
(note # 0 0 NOTE_INSN_EPILOGUE_BEG)
-(insn:TI # 0 0 (set (reg:SI 0 0)
+(insn # 0 0 (set (reg:SI 0 0)
(mem/c:SI (plus:SI (reg/f:SI 1 1)
(const_int 36 [0x24])) [ S4 A8])) "vjbxa62g.c":29:1#
{*movsi_internal1}
(nil))
-(insn # 0 0 (use (reg/i:SI 3 3)) "vjbxa62g.c":29:1#
- (nil))
-(insn/f # 0 0 (set (reg:SI 96 lr)
- (reg:SI 0 0)) "vjbxa62g.c":29:1# {*movsi_internal1}
- (expr_list:REG_DEAD (reg:SI 0 0)
- (expr_list:REG_CFA_RESTORE (reg:SI 96 lr)
- (nil))))
(insn:TI # 0 0 (set (reg:SI 31 31)
(mem/c:SI (plus:SI (reg/f:SI 1 1)
(const_int 28 [0x1c])) [ S4 A8])) "vjbxa62g.c":29:1#
{*movsi_internal1}
@@ -218,7 +213,12 @@
(expr_list:REG_CFA_DEF_CFA (reg/f:SI 1 1)
(expr_list:REG_CFA_RESTORE (reg:SI 31 31)
(nil))))
-(jump_insn:TI # 0 0 (simple_return) "vjbxa62g.c":29:1# {simple_return}
+(insn/f:TI # 0 0 (set (reg:SI 96 lr)
+ (reg:SI 0 0)) "vjbxa62g.c":29:1# {*movsi_internal1}
+ (expr_list:REG_DEAD (reg:SI 0 0)
+ (expr_list:REG_CFA_RESTORE (reg:SI 96 lr)
+ (nil))))
+(jump_insn # 0 0 (simple_return) "vjbxa62g.c":29:1# {simple_return}
(nil)
-> simple_return)
(barrier # 0 0)
