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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/111010] [13/14 regression] error: unable to find a
 register to spill compiling GCDAProfiling.c since r13-5092-g4e0b504f26f78f
Date: Fri, 18 Aug 2023 12:12:06 +0000
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X-Bugzilla-Version: 13.2.1
X-Bugzilla-Keywords: ice-on-valid-code, missed-optimization, ra
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111010

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index f3a3305ac4f..d38b9d764d8 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -11511,7 +11511,7 @@
 })

 (define_insn_and_split "*concat<mode><dwi>3_3"
-  [(set (match_operand:<DWI> 0 "nonimmediate_operand" "=3Dro,r,r,&r")
+  [(set (match_operand:<DWI> 0 "nonimmediate_operand" "=3Dro,r,r,!&r")
        (any_or_plus:<DWI>
          (ashift:<DWI>
            (zero_extend:<DWI>

fixes the issue for me, this disparages the &r,m,m alternative since
that makes any reloading difficult(?) and the early-clobber output
makes register pressure even harder to deal with.=