From b65945e7fb8d0f6cf911d371926d25e7ea82db62 Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Tue, 11 Oct 2022 15:57:09 +0200
Subject: [PATCH] i386: Fix up RTL checking ICE [PR107185]

On Tue, Oct 11, 2022 at 04:03:16PM +0800, liuhongt via Gcc-patches wrote:
> gcc/ChangeLog:
>
>       * config/i386/i386.md (*notxor<mode>_1): New post_reload
>       define_insn_and_split.
>       (*notxorqi_1): Ditto.

> --- a/gcc/config/i386/i386.md
> +++ b/gcc/config/i386/i386.md
> @@ -10826,6 +10826,39 @@ (define_insn "*<code><mode>_1"
>     (set_attr "type" "alu, alu, msklog")
>     (set_attr "mode" "<MODE>")])
>
> +(define_insn_and_split "*notxor<mode>_1"
> +  [(set (match_operand:SWI248 0 "nonimmediate_operand" "=rm,r,?k")
> +     (not:SWI248
> +       (xor:SWI248
> +         (match_operand:SWI248 1 "nonimmediate_operand" "%0,0,k")
> +         (match_operand:SWI248 2 "<general_operand>" "r<i>,<m>,k"))))
> +   (clobber (reg:CC FLAGS_REG))]
> +  "ix86_binary_operator_ok (XOR, <MODE>mode, operands)"
> +  "#"
> +  "&& reload_completed"
> +  [(parallel
> +    [(set (match_dup 0)
> +       (xor:SWI248 (match_dup 1) (match_dup 2)))
> +     (clobber (reg:CC FLAGS_REG))])
> +   (set (match_dup 0)
> +     (not:SWI248 (match_dup 1)))]
> +{
> +  if (MASK_REGNO_P (REGNO (operands[0])))

This causes --enable-checking=yes,rtl,extra regression on
gcc.dg/store_merging_13.c test on x86_64-linux:
.../gcc/testsuite/gcc.dg/store_merging_13.c: In function 'f13':
.../gcc/testsuite/gcc.dg/store_merging_13.c:189:1: internal compiler error: RTL check: expected code 'reg', have 'mem' in rhs_regno, at rtl.h:1932
0x7b0c8f rtl_check_failed_code1(rtx_def const*, rtx_code, char const*, int, char const*)
        ../../gcc/rtl.cc:916
0x8e74be rhs_regno
        ../../gcc/rtl.h:1932
0x9785fd rhs_regno
        ./genrtl.h:120
0x9785fd gen_split_260(rtx_insn*, rtx_def**)
        ../../gcc/config/i386/i386.md:10846
0x23596dc split_insns(rtx_def*, rtx_insn*)
        ../../gcc/config/i386/i386.md:16392
0xfccd5a try_split(rtx_def*, rtx_insn*, int)
        ../../gcc/emit-rtl.cc:3799
0x132e9d8 split_insn
        ../../gcc/recog.cc:3384
0x13359d5 split_all_insns()
        ../../gcc/recog.cc:3488
0x1335ae8 execute
        ../../gcc/recog.cc:4412
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

Fixed thusly.

2022-10-11  Jakub Jelinek  <jakub@redhat.com>

	PR target/107185
	* config/i386/i386.md (*notxor<mode>_1): Use MASK_REG_P (x) instead of
	MASK_REGNO_P (REGNO (x)).
---
 gcc/config/i386/i386.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 9390dd5be88..8e847520491 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -10843,7 +10843,7 @@
    (set (match_dup 0)
 	(not:SWI248 (match_dup 0)))]
 {
-  if (MASK_REGNO_P (REGNO (operands[0])))
+  if (MASK_REG_P (operands[0]))
     {
       emit_insn (gen_kxnor<mode> (operands[0], operands[1], operands[2]));
       DONE;