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From: "linkw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/103623] [12 Regression] error: unable to generate
 reloads (ICE in curr_insn_transform, at lra-constraints.c:4132), or error:
 insn does not satisfy its constraints (ICE in extract_constrain_insn_cached,
 at recog.c:2682)
Date: Fri, 18 Feb 2022 08:38:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103623

--- Comment #25 from Kewen Lin <linkw at gcc dot gnu.org> ---
The key difference from the previous bif support is that: previously we che=
cked
TARGET_HARD_FLOAT but now we didn't. I think we still need to check it, as =
the
document here
https://gcc.gnu.org/onlinedocs/gcc/Basic-PowerPC-Built-in-Functions-Availab=
le-on-ISA-2_002e05.html,
these bifs requires "-mhard-float" option. And all the alternatives of
unpack<mode>_nodm and pack<mode> with mode iterator FMOVE128 will use
constraint d which only takes effect with -mhard-float.

Just a record for the guards in the previous support:

/* 128-bit long double floating point builtins.  */
#define BU_LDBL128_2(ENUM, NAME, ATTR, ICODE)                           \
  RS6000_BUILTIN_2 (MISC_BUILTIN_ ## ENUM,              /* ENUM */      \
                    "__builtin_" NAME,                  /* NAME */      \
                    (RS6000_BTM_HARD_FLOAT              /* MASK */      \
                     | RS6000_BTM_LDBL128),                             \
                    (RS6000_BTC_ ## ATTR                /* ATTR */      \
                     | RS6000_BTC_BINARY),                              \
                    CODE_FOR_ ## ICODE)                 /* ICODE */

/* 128-bit __ibm128 floating point builtins (use -mfloat128 to indicate that
   __ibm128 is available).  */
#define BU_IBM128_2(ENUM, NAME, ATTR, ICODE)                            \
  RS6000_BUILTIN_2 (MISC_BUILTIN_ ## ENUM,              /* ENUM */      \
                    "__builtin_" NAME,                  /* NAME */      \
                    (RS6000_BTM_HARD_FLOAT              /* MASK */      \
                     | RS6000_BTM_FLOAT128),                            \
                    (RS6000_BTC_ ## ATTR                /* ATTR */      \
                     | RS6000_BTC_BINARY),                              \
                    CODE_FOR_ ## ICODE)                 /* ICODE */=