https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78325
Bug ID: 78325
Summary: [7 regression] r235825 causes
gcc.target/mips/call-5.c, gcc.target/mips/call-6.c
R_MIPS_JALR failures
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: [email protected]
Target Milestone: ---
Target: mips-linux-gnu
PR rtl-optimization/70890 fix (r235825) causes REG_EQUIV notes to be
removed from PIC call register loads in the MIPS new ABIs for function
calls to local symbols which use GOT_PAGE/GOT_OFST relocations. These
notes are used in `mips_pic_call_symbol_from_set' to determine the
actual symbol referred in call insns and use it to produce a suitable
R_MIPS_JALR relocation. Consequently the relocations are not output
anymore causing these regression test failures:
FAIL: gcc.target/mips/call-5.c -O2 scan-assembler
\\.reloc\t1f,R_MIPS_JALR,staticfunc\n1:\tjalrc?\t
FAIL: gcc.target/mips/call-5.c -O3 -g scan-assembler
\\.reloc\t1f,R_MIPS_JALR,staticfunc\n1:\tjalrc?\t
FAIL: gcc.target/mips/call-5.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none scan-assembler
\\.reloc\t1f,R_MIPS_JALR,staticfunc\n1:\tjalrc?\t
FAIL: gcc.target/mips/call-5.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects scan-assembler
\\.reloc\t1f,R_MIPS_JALR,staticfunc\n1:\tjalrc?\t
FAIL: gcc.target/mips/call-6.c -O2 scan-assembler
\\.reloc\t1f,R_MIPS_JALR,staticfunc\n1:\tjalrc?\t
FAIL: gcc.target/mips/call-6.c -O3 -g scan-assembler
\\.reloc\t1f,R_MIPS_JALR,staticfunc\n1:\tjalrc?\t
FAIL: gcc.target/mips/call-6.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none scan-assembler
\\.reloc\t1f,R_MIPS_JALR,staticfunc\n1:\tjalrc?\t
FAIL: gcc.target/mips/call-6.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects scan-assembler
\\.reloc\t1f,R_MIPS_JALR,staticfunc\n1:\tjalrc?\t
and the linker cannot perform the branch optimisation intended, which
is especially relevant for function calls to local symbols. With
r235825 reverted on top of current trunk these regressions are gone.
