Hi, As test case in PR106091 shows, rs6000 specific pass swaps doesn't preserve the reg_note REG_EH_REGION when replacing some load insn at the end of basic block, it causes the flow info verification to fail unexpectedly. Since memory reference rtx may trap, this patch is to ensure we copy REG_EH_REGION reg_note while replacing swapped aligned load or store.
Bootstrapped and regtested on powerpc64-linux-gnu P7 & P8, and powerpc64le-linux-gnu P9 & P10. Richi, could you help to review this patch from a point view of non-call-exceptions expert? I'm going to install it if it looks good to you. Thanks! ----- PR target/106091 gcc/ChangeLog: * config/rs6000/rs6000-p8swap.cc (replace_swapped_aligned_store): Copy REG_EH_REGION when replacing one store insn having it. (replace_swapped_aligned_load): Likewise. gcc/testsuite/ChangeLog: * gcc.target/powerpc/pr106091.c: New test. --- gcc/config/rs6000/rs6000-p8swap.cc | 20 ++++++++++++++++++-- gcc/testsuite/gcc.target/powerpc/pr106091.c | 15 +++++++++++++++ 2 files changed, 33 insertions(+), 2 deletions(-) create mode 100644 gcc/testsuite/gcc.target/powerpc/pr106091.c diff --git a/gcc/config/rs6000/rs6000-p8swap.cc b/gcc/config/rs6000/rs6000-p8swap.cc index 275702fee1b..19fbbfb67dc 100644 --- a/gcc/config/rs6000/rs6000-p8swap.cc +++ b/gcc/config/rs6000/rs6000-p8swap.cc @@ -1690,7 +1690,15 @@ replace_swapped_aligned_store (swap_web_entry *insn_entry, gcc_assert ((GET_CODE (new_body) == SET) && MEM_P (SET_DEST (new_body))); - set_block_for_insn (new_insn, BLOCK_FOR_INSN (store_insn)); + basic_block bb = BLOCK_FOR_INSN (store_insn); + set_block_for_insn (new_insn, bb); + /* Handle REG_EH_REGION note. */ + if (cfun->can_throw_non_call_exceptions && BB_END (bb) == store_insn) + { + rtx note = find_reg_note (store_insn, REG_EH_REGION, NULL_RTX); + if (note) + add_reg_note (new_insn, REG_EH_REGION, XEXP (note, 0)); + } df_insn_rescan (new_insn); df_insn_delete (store_insn); @@ -1784,7 +1792,15 @@ replace_swapped_aligned_load (swap_web_entry *insn_entry, rtx swap_insn) gcc_assert ((GET_CODE (new_body) == SET) && MEM_P (SET_SRC (new_body))); - set_block_for_insn (new_insn, BLOCK_FOR_INSN (def_insn)); + basic_block bb = BLOCK_FOR_INSN (def_insn); + set_block_for_insn (new_insn, bb); + /* Handle REG_EH_REGION note. */ + if (cfun->can_throw_non_call_exceptions && BB_END (bb) == def_insn) + { + rtx note = find_reg_note (def_insn, REG_EH_REGION, NULL_RTX); + if (note) + add_reg_note (new_insn, REG_EH_REGION, XEXP (note, 0)); + } df_insn_rescan (new_insn); df_insn_delete (def_insn); diff --git a/gcc/testsuite/gcc.target/powerpc/pr106091.c b/gcc/testsuite/gcc.target/powerpc/pr106091.c new file mode 100644 index 00000000000..61ce8cf4733 --- /dev/null +++ b/gcc/testsuite/gcc.target/powerpc/pr106091.c @@ -0,0 +1,15 @@ +/* { dg-options "-O -fnon-call-exceptions -fno-tree-dce -fno-tree-forwprop -w" } */ + +/* Verify there is no ICE. */ + +typedef short __attribute__ ((__vector_size__ (64))) V; +V v, w; + +inline V foo (V a, V b); + +V +foo (V a, V b) +{ + b &= v < b; + return (V){foo (b, w)[3], (V){}[3]}; +} -- 2.25.1