https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65604
Bug ID: 65604
Summary: MIPS -fno-delayed-branch generates incorrect code with
-mcheck-zero-division
Product: gcc
Version: 4.9.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: azonenberg at drawersteak dot com
When compiling code that performs integer division on MIPS with
-fno-delayed-branch and -mcheck-zero-division enabled, the generated code still
uses delay slots.
Example disassembly:
400002e8: 14400002 bnez v0,400002f4 <main+0x124>
400002ec: 0062001a div zero,v1,v0
400002f0: 0007000d break 0x7
400002f4: 00001810 mfhi v1
Expected result: Code generated with -fno-delayed-branch will run correctly on
a MIPS-like processor that does not have delay slots
Actual result: The divide is never executed on processors without delay slots
since the branch jumps.
I first noticed the issue on mips-elf-gcc 4.9.2 and have not yet tested to see
what other version(s) it is present in.
