GCC modified for the FreeChainXenon project
c5651e9bc0
We had the following mappings between <x>vfcmp submenmonics and RTX
codes:
(define_code_attr fcc
[(unordered "cun")
(ordered "cor")
(eq "ceq")
(ne "cne")
(uneq "cueq")
(unle "cule")
(unlt "cult")
(le "cle")
(lt "clt")])
This is inconsistent with scalar code:
(define_code_attr fcond [(unordered "cun")
(uneq "cueq")
(unlt "cult")
(unle "cule")
(eq "ceq")
(lt "slt")
(le "sle")
(ordered "cor")
(ltgt "sne")
(ne "cune")
(ge "sge")
(gt "sgt")
(unge "cuge")
(ungt "cugt")])
For every RTX code for which the LSX/LASX code is different from the
scalar code, the scalar code is correct and the LSX/LASX code is wrong.
Most seriously, the RTX code NE should be mapped to "cneq", not "cne".
Rewrite <x>vfcmp define_insns in simd.md using the same mapping as
scalar fcmp.
Note that GAS does not support [x]vfcmp.{c/s}[u]{ge/gt} (pseudo)
instruction (although fcmp.{c/s}[u]{ge/gt} is supported), so we need to
switch the order of inputs and use [x]vfcmp.{c/s}[u]{le/lt} instead.
The <x>vfcmp.{sult/sule/clt/cle}.{s/d} instructions do not have a single
RTX code, but they can be modeled as an inversed RTX code following a
"not" operation. Doing so allows the compiler to optimized vectorized
__builtin_isless etc. to a single instruction. This optimization should
be added for scalar code too and I'll do it later.
Tests are added for mapping between C code, IEC 60559 operations, and
vfcmp instructions.
[1]:https://gcc.gnu.org/pipermail/gcc-patches/2023-December/640713.html
gcc/ChangeLog:
PR target/113034
* config/loongarch/lasx.md (UNSPEC_LASX_XVFCMP_*): Remove.
(lasx_xvfcmp_caf_<flasxfmt>): Remove.
(lasx_xvfcmp_cune_<FLASX:flasxfmt>): Remove.
(FSC256_UNS): Remove.
(fsc256): Remove.
(lasx_xvfcmp_<vfcond:fcc>_<FLASX:flasxfmt>): Remove.
(lasx_xvfcmp_<fsc256>_<FLASX:flasxfmt>): Remove.
* config/loongarch/lsx.md (UNSPEC_LSX_XVFCMP_*): Remove.
(lsx_vfcmp_caf_<flsxfmt>): Remove.
(lsx_vfcmp_cune_<FLSX:flsxfmt>): Remove.
(vfcond): Remove.
(fcc): Remove.
(FSC_UNS): Remove.
(fsc): Remove.
(lsx_vfcmp_<vfcond:fcc>_<FLSX:flsxfmt>): Remove.
(lsx_vfcmp_<fsc>_<FLSX:flsxfmt>): Remove.
* config/loongarch/simd.md
(fcond_simd): New define_code_iterator.
(<simd_isa>_<x>vfcmp_<fcond:fcond_simd>_<simdfmt>):
New define_insn.
(fcond_simd_rev): New define_code_iterator.
(fcond_rev_asm): New define_code_attr.
(<simd_isa>_<x>vfcmp_<fcond:fcond_simd_rev>_<simdfmt>):
New define_insn.
(fcond_inv): New define_code_iterator.
(fcond_inv_rev): New define_code_iterator.
(fcond_inv_rev_asm): New define_code_attr.
(<simd_isa>_<x>vfcmp_<fcond_inv>_<simdfmt>): New define_insn.
(<simd_isa>_<x>vfcmp_<fcond_inv:fcond_inv_rev>_<simdfmt>):
New define_insn.
(UNSPEC_SIMD_FCMP_CAF, UNSPEC_SIMD_FCMP_SAF,
UNSPEC_SIMD_FCMP_SEQ, UNSPEC_SIMD_FCMP_SUN,
UNSPEC_SIMD_FCMP_SUEQ, UNSPEC_SIMD_FCMP_CNE,
UNSPEC_SIMD_FCMP_SOR, UNSPEC_SIMD_FCMP_SUNE): New unspecs.
(SIMD_FCMP): New define_int_iterator.
(fcond_unspec): New define_int_attr.
(<simd_isa>_<x>vfcmp_<fcond_unspec>_<simdfmt>): New define_insn.
* config/loongarch/loongarch.cc (loongarch_expand_lsx_cmp):
Remove unneeded special cases.
gcc/testsuite/ChangeLog:
PR target/113034
* gcc.target/loongarch/vfcmp-f.c: New test.
* gcc.target/loongarch/vfcmp-d.c: New test.
* gcc.target/loongarch/xvfcmp-f.c: New test.
* gcc.target/loongarch/xvfcmp-d.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-vcond-2.c: Scan for cune
instead of cne.
* gcc.target/loongarch/vector/lsx/lsx-vcond-2.c: Likewise.
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