[Bug target/46187] New: Invalid instruction suffix generated by %z
us15 at os dot inf.tu-dresden.de
gcc-bugzilla@gcc.gnu.org
Tue Oct 26 15:01:00 GMT 2010
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46187
Summary: Invalid instruction suffix generated by %z
Product: gcc
Version: 4.4.5
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: us15@os.inf.tu-dresden.de
Created attachment 22163
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22163
Testcase
The testcase compiled with -Os should produce something like the following:
4004cc: f0 80 6c 24 ff 01 lock subb $0x1,-0x1(%rsp)
4004d5: f0 66 83 6c 24 fc 02 lock subw $0x2,-0x4(%rsp)
4004df: f0 48 83 6c 24 f0 03 lock subq $0x3,-0x10(%rsp)
This works correctly on 4.5.1 and 4.6.0. Older compilers fail as shown below.
The code is supposed to emit the correct instruction suffix for SUB using %z
when n is an immediate value that does not give the operand size away. Is there
another way to achieve the same effect?
g++-gcc-4.1.2 -Os testcase.cc -o testcase
testcase.cc: In function 'int main()':
testcase.cc:20: internal compiler error: in print_operand, at
config/i386/i386.c:7226
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
g++-gcc-4.2.4 -Os testcase.cc -o testcase
testcase.cc: In function 'int main()':
testcase.cc:20: internal compiler error: in print_operand, at
config/i386/i386.c:7791
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
g++-gcc-4.3.5 -Os testcase.cc -o testcase
testcase.cc: Assembler messages:
testcase.cc:5: Error: invalid instruction suffix for `sub'
testcase.cc:5: Error: no such instruction: `subll $3,-16(%rsp)'
g++-gcc-4.4.5 -Os testcase.cc -o testcase
testcase.cc: Assembler messages:
testcase.cc:5: Error: invalid instruction suffix for `sub'
testcase.cc:5: Error: no such instruction: `subll $3,-16(%rsp)'
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