Hi Jeff, Sorry for the late reply.
on 2022/10/26 19:40, Jiufu Guo wrote: > Hi, > > PR106708 constaint some constants which can be support by li/lis + oris/xoris. ~~~~~~~~ typo? for "li/lis + oris/xoris", I interpreted it into four combinations: li + oris, lis + oris, li + xoris, lis + xoris. not sure just me interpreting like that, but the actual combinations which this patch adopts are: li + oris, li + xoris, lis + xoris. It's a bit off, but not a big deal, up to you to reword it or not. :) > > For constant C: > if '(c & 0xFFFFFFFF80008000ULL) == 0x80000000ULL' or say: > 32(0) || 1(1) || 15(x) || 1(0) || 15(x), we could use li+oris to > build constant 'C'. > Here N(M) means N continuous bit M, x for M means it is ok for either > 1 or 0; '||' means concatenation. > > if '(c & 0xFFFFFFFF00008000ULL) == 0xFFFFFFFF00008000ULL' or say: > 32(1) || 16(x) || 1(1) || 15(x), using li+xoris would be ok. > > if '(c & 0xFFFFFFFF0000FFFFULL) == 0xFFFFFFFF00000000' or say: > 32(1) || 1(0) || 15(x) || 16(0), using lis+xoris would be ok. > > This patch update rs6000_emit_set_long_const to support these forms. > Bootstrap and regtest pass on ppc64 and ppc64le. > > Is this ok for trunk? This updated version looks good to me, but I'd leave it to Segher for the final say. Thanks! BR, Kewen > > BR, > Jeff(Jiufu) > > > PR target/106708 > > gcc/ChangeLog: > > * config/rs6000/rs6000.cc (rs6000_emit_set_long_const): Support > constants which can be built with li + oris or li/lis + xoris. > > gcc/testsuite/ChangeLog: > > * gcc.target/powerpc/pr106708-run.c: New test. > * gcc.target/powerpc/pr106708.c: New test. > * gcc.target/powerpc/pr106708.h: New file. > > --- > gcc/config/rs6000/rs6000.cc | 41 ++++++++++++++----- > .../gcc.target/powerpc/pr106708-run.c | 17 ++++++++ > gcc/testsuite/gcc.target/powerpc/pr106708.c | 12 ++++++ > gcc/testsuite/gcc.target/powerpc/pr106708.h | 9 ++++ > 4 files changed, 69 insertions(+), 10 deletions(-) > create mode 100644 gcc/testsuite/gcc.target/powerpc/pr106708-run.c > create mode 100644 gcc/testsuite/gcc.target/powerpc/pr106708.c > create mode 100644 gcc/testsuite/gcc.target/powerpc/pr106708.h > > diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc > index d2743f7bce6..9b7a51f052d 100644 > --- a/gcc/config/rs6000/rs6000.cc > +++ b/gcc/config/rs6000/rs6000.cc > @@ -10228,6 +10228,7 @@ rs6000_emit_set_long_const (rtx dest, HOST_WIDE_INT c) > { > rtx temp; > HOST_WIDE_INT ud1, ud2, ud3, ud4; > + HOST_WIDE_INT orig_c = c; > > ud1 = c & 0xffff; > c = c >> 16; > @@ -10253,21 +10254,41 @@ rs6000_emit_set_long_const (rtx dest, HOST_WIDE_INT > c) > gen_rtx_IOR (DImode, copy_rtx (temp), > GEN_INT (ud1))); > } > + else if ((ud4 == 0xffff && ud3 == 0xffff) > + && ((ud1 & 0x8000) || (ud1 == 0 && !(ud2 & 0x8000)))) > + { > + temp = !can_create_pseudo_p () ? dest : gen_reg_rtx (DImode); > + > + HOST_WIDE_INT imm = (ud1 & 0x8000) ? ((ud1 ^ 0x8000) - 0x8000) > + : ((ud2 << 16) - 0x80000000); > + /* li/lis + xoris */ > + emit_move_insn (temp, GEN_INT (imm)); > + emit_move_insn (dest, gen_rtx_XOR (DImode, temp, > + GEN_INT (orig_c ^ imm))); > + } > else if (ud3 == 0 && ud4 == 0) > { > temp = !can_create_pseudo_p () ? dest : gen_reg_rtx (DImode); > > gcc_assert (ud2 & 0x8000); > - emit_move_insn (copy_rtx (temp), > - GEN_INT (((ud2 << 16) ^ 0x80000000) - 0x80000000)); > - if (ud1 != 0) > - emit_move_insn (copy_rtx (temp), > - gen_rtx_IOR (DImode, copy_rtx (temp), > - GEN_INT (ud1))); > - emit_move_insn (dest, > - gen_rtx_ZERO_EXTEND (DImode, > - gen_lowpart (SImode, > - copy_rtx (temp)))); > + > + if (!(ud1 & 0x8000)) > + { > + /* li+oris */ > + emit_move_insn (temp, GEN_INT (ud1)); > + emit_move_insn (dest, > + gen_rtx_IOR (DImode, temp, GEN_INT (ud2 << 16))); > + } > + else > + { > + emit_move_insn (temp, > + GEN_INT (((ud2 << 16) ^ 0x80000000) - 0x80000000)); > + if (ud1 != 0) > + emit_move_insn (temp, gen_rtx_IOR (DImode, temp, GEN_INT (ud1))); > + emit_move_insn (dest, > + gen_rtx_ZERO_EXTEND (DImode, > + gen_lowpart (SImode, temp))); > + } > } > else if (ud1 == ud3 && ud2 == ud4) > { > diff --git a/gcc/testsuite/gcc.target/powerpc/pr106708-run.c > b/gcc/testsuite/gcc.target/powerpc/pr106708-run.c > new file mode 100644 > index 00000000000..df65c321f6b > --- /dev/null > +++ b/gcc/testsuite/gcc.target/powerpc/pr106708-run.c > @@ -0,0 +1,17 @@ > +/* PR target/106708 */ > +/* { dg-do run } */ > +/* { dg-options "-O2" } */ > + > +#include "pr106708.h" > + > +long long arr[] = {0x98765432ULL, 0xffffffff7cdeab55ULL, > 0xffffffff65430000ULL}; > +int > +main () > +{ > + long long a[3]; > + > + foo (a); > + if (__builtin_memcmp (a, arr, sizeof (arr)) != 0) > + __builtin_abort (); > + return 0; > +} > diff --git a/gcc/testsuite/gcc.target/powerpc/pr106708.c > b/gcc/testsuite/gcc.target/powerpc/pr106708.c > new file mode 100644 > index 00000000000..ebd9ea88993 > --- /dev/null > +++ b/gcc/testsuite/gcc.target/powerpc/pr106708.c > @@ -0,0 +1,12 @@ > +/* PR target/106708 */ > +/* { dg-do compile } } */ > +/* { dg-options "-O2 -mdejagnu-cpu=power8" } */ > +/* { dg-require-effective-target has_arch_ppc64 } */ > + > + > +#include "pr106708.h" > + > +/* { dg-final { scan-assembler-times {\mli\M} 2 } } */ > +/* { dg-final { scan-assembler-times {\mlis\M} 1 } } */ > +/* { dg-final { scan-assembler-times {\moris\M} 1 } } */ > +/* { dg-final { scan-assembler-times {\mxoris\M} 2 } } */ > diff --git a/gcc/testsuite/gcc.target/powerpc/pr106708.h > b/gcc/testsuite/gcc.target/powerpc/pr106708.h > new file mode 100644 > index 00000000000..42526a70892 > --- /dev/null > +++ b/gcc/testsuite/gcc.target/powerpc/pr106708.h > @@ -0,0 +1,9 @@ > +/* Test constants which can be built by li/lis + oris/xoris */ > +void __attribute__ ((__noinline__, __noclone__)) foo (long long *arg) > +{ > + *arg++ = 0x98765432ULL; > + *arg++ = 0xffffffff7cdeab55ULL; > + *arg++ = 0xffffffff65430000ULL; > +} > + > +