[Bug target/59837] New: [ARM] ICE when building linux-linaro-tracking

["zhenqiang.chen at linaro dot org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59837

            Bug ID: 59837
           Summary: [ARM] ICE when building linux-linaro-tracking
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhenqiang.chen at linaro dot org

Created attachment 31849
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31849&action=edit
testcase

arm-linux-gnueabi-gcc neon.c -Os -fno-omit-frame-pointer -mapcs
-mabi=aapcs-linux -mfloat-abi=softfp -mfpu=neon -g -S -marm

neon.c: In function âraid6_neon4_gen_syndrome_realâ:
neon.c:79:1: internal compiler error: in dwarf2out_frame_debug_adjust_cfa, at
dwarf2cfi.c:1090

Root cause:
When expanding epilogue, REG_CFA_ADJUST_CFA NOTE is added to handle dwarf info
issue for shrink-wrap. But for TARGET_APCS_FRAME, shrink-wrap is disabled. And
not all dwarf info in arm_expand_epilogue_apcs_frame are correctly updated.
arm_emit_vfp_multi_reg_pop is called by both arm_expand_epilogue_apcs_frame and
arm_expand_epilogue. So we should not add the NOTE in
arm_emit_vfp_multi_reg_pop if shrink-wrap is not enabled.