Hi, The patch fixes ICE when building kernel raid6 neon code.
lib/raid6/neon4.c: In function 'raid6_ neon4_gen_syndrome_real': lib/raid6/neon4.c:113:1: internal compiler error: in dwarf2out_frame_debug_adjust_cfa, at dwarf2cfi.c:1090 } https://bugs.launchpad.net/gcc-linaro/+bug/1268893 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. Boot strap and no make check regression on ARM Chromebook. OK for trunk? Thanks! -Zhenqiang ChangeLog: 2014-01-15 Zhenqiang Chen <zhenqiang.c...@linaro.org> * config/arm/arm.c (arm_emit_vfp_multi_reg_pop): Do not add REG_CFA_ADJUST_CFA NOTE if shrink-wrap is not enabled. diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index 18196b3..1ccb796 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -19890,8 +19890,12 @@ arm_emit_vfp_multi_reg_pop (int first_reg, int num_regs, rtx base_reg) par = emit_insn (par); REG_NOTES (par) = dwarf; - arm_add_cfa_adjust_cfa_note (par, 2 * UNITS_PER_WORD * num_regs, - base_reg, base_reg); + /* REG_CFA_ADJUST_CFA NOTE is added to handle dwarf info issue when + shrink-wrap is enabled. So when shrink-wrap is not enabled, we should + not add the note. */ + if (flag_shrink_wrap) + arm_add_cfa_adjust_cfa_note (par, 2 * UNITS_PER_WORD * num_regs, + base_reg, base_reg); } /* Generate and emit a pattern that will be recognized as LDRD pattern. If even
