[Bug debug/104263] New: [10/11/12 Regression] '-fcompare-debug' failure (length) w/ -O2 -fnon-call-exceptions -fno-inline-small-functions
asolokha at gmx dot com
gcc-bugzilla@gcc.gnu.org
Fri Jan 28 02:51:04 GMT 2022
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104263
Bug ID: 104263
Summary: [10/11/12 Regression] '-fcompare-debug' failure
(length) w/ -O2 -fnon-call-exceptions
-fno-inline-small-functions
Product: gcc
Version: 12.0
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: ---
gcc 12.0.1 20220123 snapshot (g:2da90ad39bf8fa9ee287e040d1f4411cb7a2e7ed) fails
-fcompare-debug check when compiling the following testcase w/ -O2
-fnon-call-exceptions -fno-inline-small-functions:
int n;
int
bar (void)
{
int a;
n = 0;
a = 0;
return n;
}
__attribute__ ((pure, returns_twice)) int
foo (void)
{
n = bar () + 1;
foo ();
return 0;
}
% gcc-12.0.1 -O2 -fcompare-debug -fnon-call-exceptions
-fno-inline-small-functions -gno-statement-frontiers -c ovslsrlb.c
x86_64-pc-linux-gnu-gcc-12.0.1: error: ovslsrlb.c: '-fcompare-debug' failure
(length)
For x86_64 the difference looks like this, though the failure is not
target-specific:
--- ovslsrlb.c.gkd 2022-01-28 09:42:43.969435346 +0700
+++ ovslsrlb.gk.c.gkd 2022-01-28 09:42:43.987435394 +0700
@@ -40,8 +40,8 @@
(note # 0 0 [bb 2] NOTE_INSN_BASIC_BLOCK)
(note # 0 0 NOTE_INSN_PROLOGUE_END)
(note # 0 0 NOTE_INSN_FUNCTION_BEG)
-(insn:TI # 0 0 2 (set (mem/c:SI (symbol_ref:DI ("n") [flags 0x2] <var_decl #
n>) [ MEM[(int *)&n]+0 S4 A32])
- (const_int 1 [0x1])) "ovslsrlb.c":8:5# {*movsi_internal}
+(insn:TI # 0 0 2 (set (mem/c:SI (symbol_ref:DI ("n") [flags 0x2] <var_decl #
n>) [ n+0 S4 A32])
+ (const_int 1 [0x1])) "ovslsrlb.c":17:5# {*movsi_internal}
(nil))
(insn # 0 0 2 (parallel [
(set (reg:DI 0 ax)
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