http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59896
Bug ID: 59896
Summary: Thumb-1 LRA unable to generate reloads for jump_insn
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: terry.guo at arm dot com
Created attachment 31903
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31903&action=edit
A preprocessed test case
Use trunk gcc to compile attached case with command "arm-none-eabi-gcc -mthumb
-O2 -S dtoa.i", we will get below error:
/home/build/work/GCC-4-9-build/src/newlib/newlib/libc/stdlib/dtoa.c: In
function '_dtoa_r':
/home/build/work/GCC-4-9-build/src/newlib/newlib/libc/stdlib/dtoa.c:862:1:
error: unable to generate reloads for:
(jump_insn 424 2763 425 32 (parallel [
(set (pc)
(if_then_else (ge (plus:SI (reg:SI 491 [ D.6302 ])
(const_int -1 [0xffffffffffffffff]))
(const_int 0 [0]))
(label_ref:SI 427)
(pc)))
(set (reg/v:SI 178 [ s2 ])
(plus:SI (reg:SI 491 [ D.6302 ])
(const_int -1 [0xffffffffffffffff])))
(clobber (reg:SI 833))
])
/home/build/work/GCC-4-9-build/src/newlib/newlib/libc/stdlib/dtoa.c:369 225
{*addsi3_cbranch}
(expr_list:REG_UNUSED (reg:SI 833)
(expr_list:REG_DEAD (reg:SI 491 [ D.6302 ])
(int_list:REG_BR_PROB 7300 (nil))))
-> 427)
/home/build/work/GCC-4-9-build/src/newlib/newlib/libc/stdlib/dtoa.c:862:1:
internal compiler error: in curr_insn_transform, at lra-constraints.c:3220
0xaa7a9b _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/myssd/terguo01/toolchain-build/thumb1-uxtb/src/gcc/gcc/rtl-error.c:109
0x9a9f71 curr_insn_transform
/myssd/terguo01/toolchain-build/thumb1-uxtb/src/gcc/gcc/lra-constraints.c:3220
0x9acb2a lra_constraints(bool)
/myssd/terguo01/toolchain-build/thumb1-uxtb/src/gcc/gcc/lra-constraints.c:4115
0x999647 lra(_IO_FILE*)
/myssd/terguo01/toolchain-build/thumb1-uxtb/src/gcc/gcc/lra.c:2339
0x947791 do_reload
/myssd/terguo01/toolchain-build/thumb1-uxtb/src/gcc/gcc/ira.c:5457
0x947ada rest_of_handle_reload
/myssd/terguo01/toolchain-build/thumb1-uxtb/src/gcc/gcc/ira.c:5598
0x947b24 execute
/myssd/terguo01/toolchain-build/thumb1-uxtb/src/gcc/gcc/ira.c:5627
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
The gcc version is:
gcc version 4.9.0 20140120 (experimental)
If we disable LRA, there is no such issue.
