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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/109610] [14 regression] gcc.target/powerpc/dform-3.c
 fails after r14-172-g0368d169492017
Date: Wed, 26 Apr 2023 06:41:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109610

--- Comment #5 from Hongtao.liu <crazylht at gmail dot com> ---
One solution is add an peephole for handle such redudancy.

+;; Peephole to catch memory loads to VSX_REG and then moves to GENERAL_REG=
S.
+(define_peephole2
+  [(set (match_operand:VSX_M 0 "vsx_register_operand")
+       (match_operand:VSX_M 1 "memory_operand"))
+   (set (match_operand:VSX_M 2 "int_reg_operand")
+       (match_dup 0))]
+  "TARGET_POWERPC64 && VECTOR_MEM_VSX_P (<MODE>mode)
+  && peep2_reg_dead_p (2, operands[0])"
+  [(set (match_dup 2) (match_dup 1))])


If powerpc maintainer doesn't like this way, another alternative is add a
target hook in RA to still use GENEREAL_REGS for other targets, but use NO_=
REGS
only for x86.=