http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55433
Bug #: 55433
Summary: [4.8 Regression] ICE on excessive reloads
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
The 9-line stand-alone test case at the end of this report fails as show below
on MacOS (at least versions 10.6 and 10.8) on x86-64 machines when targeting
the ILP32 ABI. It notably does NOT fail on Linux/x86-64.
This was seen in SVN r193679 (on MacOSX 10.6) and r193709 (on MacOSX 10.8).
--cut--
$ gcc -m32 -O1 -fpreprocessed -c testcase.c
testcase.c: In function 'test':
testcase.c:10:1: internal compiler error: Max. number of generated reload insns
per insn is achieved (90)
}
^
testcase.c:9:1: internal compiler error: Abort trap
gcc: internal compiler error: Abort trap (program cc1)
Abort trap
--cut--
Note that while the error message is the same as bug 55247, I have confirmed
that the test case attached to that bug report has NOT regressed. Therefore, I
believe this is a different bug (though possibly related).
Some additional data:
+ -m32 is required (no bug seen w/ -m64)
+ Linux host is fine (w/ -m32 and -m64)
+ -O1 is sufficient, but -O2 and -O3 fail in the same manner
+ removing "unsigned" from the typedef eliminates the problem
+ adding -mno-sse to the command line eliminates the problem
The testcase:
typedef unsigned long long tick_t; // NOTE: no bug if "unsigned" is removed
extern int foo(void);
extern tick_t tick(void);
double test(void) {
struct { tick_t ticks; } st;
st.ticks = tick();
foo(); // NOTE: no bug if this call is removed
return (double)st.ticks;
}
