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From: Michael Meissner <meissner@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc(refs/users/meissner/heads/work053)] Add IEEE 128-bit min/max support on PowerPC. Date: Mon, 17 May 2021 18:05:12 +0000 (GMT) [thread overview] Message-ID: <20210517180512.7A2D038930CC@sourceware.org> (raw) https://gcc.gnu.org/g:94727e1b1fac66a9d47b374efccea9ffa5539ca6 commit 94727e1b1fac66a9d47b374efccea9ffa5539ca6 Author: Michael Meissner <meissner@linux.ibm.com> Date: Mon May 17 14:03:29 2021 -0400 Add IEEE 128-bit min/max support on PowerPC. This patch adds the support for the IEEE 128-bit floating point C minimum and maximum instructions. The next patch will add the support for using the compare and set mask instruction to implement conditional moves. This patch does not try to re-use the code used for SF/DF min/max support. It defines a separate insn for the IEEE 128-bit support. It uses the code iterator <minmax> to simplify adding both operations. GCC will not convert ?: operations into using min/max instructions provided in this patch unless the user uses -Ofast or similar switches due to issues with NaNs. The next patch that adds conditional move instructions will enable the ?: conversion in many cases. gcc/ 2021-05-17 Michael Meissner <meissner@linux.ibm.com> * config/rs6000/rs6000.c (rs6000_emit_minmax): Add support for ISA 3.1 IEEE 128-bit floating point xsmaxcqp and xsmincqp instructions. * config/rs6000/rs6000.md (s<minmax><mode>3, IEEE128 iterator): New insns. gcc/testsuite/ 2021-05-17 Michael Meissner <meissner@linux.ibm.com> * gcc.target/powerpc/float128-minmax-2.c: New test. Diff: --- gcc/config/rs6000/rs6000.c | 3 ++- gcc/config/rs6000/rs6000.md | 11 +++++++++++ gcc/testsuite/gcc.target/powerpc/float128-minmax-2.c | 15 +++++++++++++++ 3 files changed, 28 insertions(+), 1 deletion(-) diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c index 53a9f5411c7..cdeb1737aef 100644 --- a/gcc/config/rs6000/rs6000.c +++ b/gcc/config/rs6000/rs6000.c @@ -16111,7 +16111,8 @@ rs6000_emit_minmax (rtx dest, enum rtx_code code, rtx op0, rtx op1) /* VSX/altivec have direct min/max insns. */ if ((code == SMAX || code == SMIN) && (VECTOR_UNIT_ALTIVEC_OR_VSX_P (mode) - || (mode == SFmode && VECTOR_UNIT_VSX_P (DFmode)))) + || (mode == SFmode && VECTOR_UNIT_VSX_P (DFmode)) + || (TARGET_POWER10 && TARGET_FLOAT128_HW && FLOAT128_IEEE_P (mode)))) { emit_insn (gen_rtx_SET (dest, gen_rtx_fmt_ee (code, mode, op0, op1))); return; diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md index 0bfeb24d9e8..3a1bc1f8547 100644 --- a/gcc/config/rs6000/rs6000.md +++ b/gcc/config/rs6000/rs6000.md @@ -5196,6 +5196,17 @@ } [(set_attr "type" "fp")]) +;; Min/max for ISA 3.1 IEEE 128-bit floating point +(define_insn "s<minmax><mode>3" + [(set (match_operand:IEEE128 0 "altivec_register_operand" "=v") + (fp_minmax:IEEE128 + (match_operand:IEEE128 1 "altivec_register_operand" "v") + (match_operand:IEEE128 2 "altivec_register_operand" "v")))] + "TARGET_POWER10" + "xs<minmax>cqp %0,%1,%2" + [(set_attr "type" "vecfloat") + (set_attr "size" "128")]) + ;; The conditional move instructions allow us to perform max and min operations ;; even when we don't have the appropriate max/min instruction using the FSEL ;; instruction. diff --git a/gcc/testsuite/gcc.target/powerpc/float128-minmax-2.c b/gcc/testsuite/gcc.target/powerpc/float128-minmax-2.c new file mode 100644 index 00000000000..c71ba08c9f8 --- /dev/null +++ b/gcc/testsuite/gcc.target/powerpc/float128-minmax-2.c @@ -0,0 +1,15 @@ +/* { dg-require-effective-target ppc_float128_hw } */ +/* { dg-require-effective-target power10_ok } */ +/* { dg-options "-mdejagnu-cpu=power10 -O2 -ffast-math" } */ + +#ifndef TYPE +#define TYPE _Float128 +#endif + +/* Test that the fminf128/fmaxf128 functions generate if/then/else and not a + call. */ +TYPE f128_min (TYPE a, TYPE b) { return __builtin_fminf128 (a, b); } +TYPE f128_max (TYPE a, TYPE b) { return __builtin_fmaxf128 (a, b); } + +/* { dg-final { scan-assembler {\mxsmaxcqp\M} } } */ +/* { dg-final { scan-assembler {\mxsmincqp\M} } } */
next reply other threads:[~2021-05-17 18:05 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-05-17 18:05 Michael Meissner [this message] 2021-05-18 1:32 Michael Meissner
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