http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56890
Bug #: 56890
Summary: Invalid fdtox %f8, %f9 on Sparc 64 Bits with -O2
Classification: Unclassified
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: [email protected]
ReportedBy: [email protected]
Created attachment 29835
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29835
Minimal test case (only for -O2)
gcc 4.7.2
config.nice:
Will attach minimal C test case and assembler file.
GCC flags: gcc -m64 -O2
Error message:
/usr/ccs/bin/as: "test.s", line 29: error: invalid (misaligned) register
Problematic assembler line:
fdtox %f8, %f9
Sun assembler version:
/usr/ccs/bin/as: SunOS 5.10 118683-08 Patch 07/05/2012
It seems the second argument needs an even register number.
Another reporter also ran into the problem with GCC 4.6.3, but this works here,
so maybe a problem with one of the helper libraries mpc, gmp, mpfr?
Bug also reported for FreeBSD/sparc64.
A slightly bigger test case closer to the original code (also attached) also
gives an error when compiling only with "-O" or "-O1" instead of "-O2":
test.c: In function 'buggy':
test.c:13:1: error: insn does not satisfy its constraints:
(insn 103 38 39 3 (set (reg:HI 40 %f8 [151])
(reg:HI 42 %f10)) test.c:6 58 {*movhi_insn}
(nil))
test.c:13:1: internal compiler error: in reload_cse_simplify_operands, at
postreload.c:403
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
Original bug report was against the Apache Web Server:
https://issues.apache.org/bugzilla/show_bug.cgi?id=52900
Regards,
Rainer
