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From: David Faust <dfaust@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-4566] bpf: add define_insn for bswap Date: Thu, 8 Dec 2022 18:50:59 +0000 (GMT) [thread overview] Message-ID: <20221208185059.A607C3890860@sourceware.org> (raw) https://gcc.gnu.org/g:5ddfe794405a514824382e96b1047d3195af23cc commit r13-4566-g5ddfe794405a514824382e96b1047d3195af23cc Author: David Faust <david.faust@oracle.com> Date: Thu Dec 8 10:08:22 2022 -0800 bpf: add define_insn for bswap The eBPF architecture provides 'end[be,le]' instructions for endianness swapping. Add a define_insn for bswap<mode>2 to use them instaed of falling back on a libcall. gcc/ * config/bpf/bpf.md (bswap<mode>2): New define_insn. gcc/testsuite/ * gcc.target/bpf/bswap-1.c: New test. Diff: --- gcc/config/bpf/bpf.md | 17 +++++++++++++++++ gcc/testsuite/gcc.target/bpf/bswap-1.c | 23 +++++++++++++++++++++++ 2 files changed, 40 insertions(+) diff --git a/gcc/config/bpf/bpf.md b/gcc/config/bpf/bpf.md index a28021aef26..22a133f1c79 100644 --- a/gcc/config/bpf/bpf.md +++ b/gcc/config/bpf/bpf.md @@ -341,6 +341,23 @@ "rsh<msuffix>\t%0,%2" [(set_attr "type" "<mtype>")]) +;;;; Endianness conversion + +(define_mode_iterator BSM [HI SI DI]) +(define_mode_attr endmode [(HI "16") (SI "32") (DI "64")]) + +(define_insn "bswap<BSM:mode>2" + [(set (match_operand:BSM 0 "register_operand" "=r") + (bswap:BSM (match_operand:BSM 1 "register_operand" " r")))] + "" +{ + if (TARGET_BIG_ENDIAN) + return "endle\t%0, <endmode>"; + else + return "endbe\t%0, <endmode>"; +} + [(set_attr "type" "end")]) + ;;;; Conditional branches ;; The eBPF jump instructions use 64-bit arithmetic when evaluating diff --git a/gcc/testsuite/gcc.target/bpf/bswap-1.c b/gcc/testsuite/gcc.target/bpf/bswap-1.c new file mode 100644 index 00000000000..4748143ada5 --- /dev/null +++ b/gcc/testsuite/gcc.target/bpf/bswap-1.c @@ -0,0 +1,23 @@ +/* { dg-do compile } */ +/* { dg-options "-mlittle-endian" } */ + +unsigned short in16 = 0x1234U; +unsigned int in32 = 0x12345678U; +unsigned long in64 = 0x123456789abcdef0ULL; + +unsigned short out16 = 0; +unsigned int out32 = 0; +unsigned long out64 = 0; + +int foo (void) +{ + out16 = __builtin_bswap16 (in16); + out32 = __builtin_bswap32 (in32); + out64 = __builtin_bswap64 (in64); + + return 0; +} + +/* { dg-final { scan-assembler "endbe\t%r., 16" } } */ +/* { dg-final { scan-assembler "endbe\t%r., 32" } } */ +/* { dg-final { scan-assembler "endbe\t%r., 64" } } */
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