On Tue, Sep 24, 2019 at 5:29 PM Dmitrij Pochepko
<dmitrij.poche...@bell-sw.com> wrote:
>
> Hi,
>
> can anybody take a look at v2?
+ (if (tree_to_uhwi (@4) == 1
+ && tree_to_uhwi (@10) == 2 && tree_to_uhwi (@5) == 4
those will still ICE for large __int128_t constants. Since you do not match
any conversions you should probably restrict the precision of 'type' like
with
(if (TYPE_PRECISION (type) <= 64
&& tree_to_uhwi (@4) ...
likewise tree_to_uhwi will fail for negative constants thus if the
pattern assumes
unsigned you should verify that as well with && TYPE_UNSIGNED (type).
Your 'argtype' is simply 'type' so you can elide it.
+ (switch
+ (if (types_match (argtype, long_long_unsigned_type_node))
+ (convert (BUILT_IN_POPCOUNTLL:integer_type_node @0)))
+ (if (types_match (argtype, long_unsigned_type_node))
+ (convert (BUILT_IN_POPCOUNTL:integer_type_node @0)))
+ (if (types_match (argtype, unsigned_type_node))
+ (convert (BUILT_IN_POPCOUNT:integer_type_node @0)))))))
Please test small types first so we can avoid popcountll when long == long long
or long == int. I also wonder if we really want to use the builtins and
check optab availability or if we nowadays should use
direct_internal_fn_supported_p (IFN_POPCOUNT, integer_type_node, type,
OPTIMIZE_FOR_BOTH) and
(convert (IFN_POPCOUNT:type @0))
without the switch?
Thanks,
Richard.
> Thanks,
> Dmitrij
>
> On Mon, Sep 09, 2019 at 10:03:40PM +0300, Dmitrij Pochepko wrote:
> > Hi all.
> >
> > Please take a look at v2 (attached).
> > I changed patch according to review comments. The same testing was
> > performed again.
> >
> > Thanks,
> > Dmitrij
> >
> > On Thu, Sep 05, 2019 at 06:34:49PM +0300, Dmitrij Pochepko wrote:
> > > This patch adds matching for Hamming weight (popcount) implementation.
> > > The following sources:
> > >
> > > int
> > > foo64 (unsigned long long a)
> > > {
> > > unsigned long long b = a;
> > > b -= ((b>>1) & 0x5555555555555555ULL);
> > > b = ((b>>2) & 0x3333333333333333ULL) + (b & 0x3333333333333333ULL);
> > > b = ((b>>4) + b) & 0x0F0F0F0F0F0F0F0FULL;
> > > b *= 0x0101010101010101ULL;
> > > return (int)(b >> 56);
> > > }
> > >
> > > and
> > >
> > > int
> > > foo32 (unsigned int a)
> > > {
> > > unsigned long b = a;
> > > b -= ((b>>1) & 0x55555555UL);
> > > b = ((b>>2) & 0x33333333UL) + (b & 0x33333333UL);
> > > b = ((b>>4) + b) & 0x0F0F0F0FUL;
> > > b *= 0x01010101UL;
> > > return (int)(b >> 24);
> > > }
> > >
> > > and equivalents are now recognized as popcount for platforms with hw
> > > popcount support. Bootstrapped and tested on x86_64-pc-linux-gnu and
> > > aarch64-linux-gnu systems with no regressions.
> > >
> > > (I have no write access to repo)
> > >
> > > Thanks,
> > > Dmitrij
> > >
> > >
> > > gcc/ChangeLog:
> > >
> > > PR tree-optimization/90836
> > >
> > > * gcc/match.pd (popcount): New pattern.
> > >
> > > gcc/testsuite/ChangeLog:
> > >
> > > PR tree-optimization/90836
> > >
> > > * lib/target-supports.exp (check_effective_target_popcount)
> > > (check_effective_target_popcountll): New effective targets.
> > > * gcc.dg/tree-ssa/popcount4.c: New test.
> > > * gcc.dg/tree-ssa/popcount4l.c: New test.
> > > * gcc.dg/tree-ssa/popcount4ll.c: New test.
> >
> > > diff --git a/gcc/match.pd b/gcc/match.pd
> > > index 0317bc7..b1867bf 100644
> > > --- a/gcc/match.pd
> > > +++ b/gcc/match.pd
> > > @@ -5358,6 +5358,70 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
> > > (cmp (popcount @0) integer_zerop)
> > > (rep @0 { build_zero_cst (TREE_TYPE (@0)); }))))
> > >
> > > +/* 64- and 32-bits branchless implementations of popcount are detected:
> > > +
> > > + int popcount64c (uint64_t x)
> > > + {
> > > + x -= (x >> 1) & 0x5555555555555555ULL;
> > > + x = (x & 0x3333333333333333ULL) + ((x >> 2) &
> > > 0x3333333333333333ULL);
> > > + x = (x + (x >> 4)) & 0x0f0f0f0f0f0f0f0fULL;
> > > + return (x * 0x0101010101010101ULL) >> 56;
> > > + }
> > > +
> > > + int popcount32c (uint32_t x)
> > > + {
> > > + x -= (x >> 1) & 0x55555555;
> > > + x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
> > > + x = (x + (x >> 4)) & 0x0f0f0f0f;
> > > + return (x * 0x01010101) >> 24;
> > > + } */
> > > +(simplify
> > > + (convert
> > > + (rshift
> > > + (mult
> > > + (bit_and:c
> > > + (plus:c
> > > + (rshift @8 INTEGER_CST@5)
> > > + (plus:c@8
> > > + (bit_and @6 INTEGER_CST@7)
> > > + (bit_and
> > > + (rshift
> > > + (minus@6
> > > + @0
> > > + (bit_and
> > > + (rshift @0 INTEGER_CST@4)
> > > + INTEGER_CST@11))
> > > + INTEGER_CST@10)
> > > + INTEGER_CST@9)))
> > > + INTEGER_CST@3)
> > > + INTEGER_CST@2)
> > > + INTEGER_CST@1))
> > > + /* Check constants and optab. */
> > > + (with
> > > + {
> > > + tree argtype = TREE_TYPE (@0);
> > > + unsigned prec = TYPE_PRECISION (argtype);
> > > + int shift = TYPE_PRECISION (long_long_unsigned_type_node) - prec;
> > > + const unsigned long long c1 = 0x0101010101010101ULL >> shift,
> > > + c2 = 0x0F0F0F0F0F0F0F0FULL >> shift,
> > > + c3 = 0x3333333333333333ULL >> shift,
> > > + c4 = 0x5555555555555555ULL >> shift;
> > > + }
> > > + (if (types_match (type, integer_type_node) && tree_to_uhwi (@4) == 1
> > > + && tree_to_uhwi (@10) == 2 && tree_to_uhwi (@5) == 4
> > > + && tree_to_uhwi (@1) == prec - 8 && tree_to_uhwi (@2) == c1
> > > + && tree_to_uhwi (@3) == c2 && tree_to_uhwi (@9) == c3
> > > + && tree_to_uhwi (@7) == c3 && tree_to_uhwi (@11) == c4
> > > + && optab_handler (popcount_optab, TYPE_MODE (argtype))
> > > + != CODE_FOR_nothing)
> > > + (switch
> > > + (if (types_match (argtype, long_long_unsigned_type_node))
> > > + (BUILT_IN_POPCOUNTLL @0))
> > > + (if (types_match (argtype, long_unsigned_type_node))
> > > + (BUILT_IN_POPCOUNTL @0))
> > > + (if (types_match (argtype, unsigned_type_node))
> > > + (BUILT_IN_POPCOUNT @0))))))
> > > +
> > > /* Simplify:
> > >
> > > a = a1 op a2
> > > diff --git a/gcc/testsuite/gcc.dg/tree-ssa/popcount4.c
> > > b/gcc/testsuite/gcc.dg/tree-ssa/popcount4.c
> > > new file mode 100644
> > > index 0000000..9f759f8
> > > --- /dev/null
> > > +++ b/gcc/testsuite/gcc.dg/tree-ssa/popcount4.c
> > > @@ -0,0 +1,22 @@
> > > +/* { dg-do compile } */
> > > +/* { dg-require-effective-target popcount } */
> > > +/* { dg-require-effective-target int32plus } */
> > > +/* { dg-options "-O2 -fdump-tree-optimized" } */
> > > +
> > > +const unsigned m1 = 0x55555555UL;
> > > +const unsigned m2 = 0x33333333UL;
> > > +const unsigned m4 = 0x0F0F0F0FUL;
> > > +const unsigned h01 = 0x01010101UL;
> > > +const int shift = 24;
> > > +
> > > +int popcount64c(unsigned x)
> > > +{
> > > + x -= (x >> 1) & m1;
> > > + x = (x & m2) + ((x >> 2) & m2);
> > > + x = (x + (x >> 4)) & m4;
> > > + return (x * h01) >> shift;
> > > +}
> > > +
> > > +/* { dg-final { scan-tree-dump-times "__builtin_popcount" 1 "optimized"
> > > } } */
> > > +
> > > +
> > > diff --git a/gcc/testsuite/gcc.dg/tree-ssa/popcount4l.c
> > > b/gcc/testsuite/gcc.dg/tree-ssa/popcount4l.c
> > > new file mode 100644
> > > index 0000000..ab33f79
> > > --- /dev/null
> > > +++ b/gcc/testsuite/gcc.dg/tree-ssa/popcount4l.c
> > > @@ -0,0 +1,30 @@
> > > +/* { dg-do compile } */
> > > +/* { dg-require-effective-target popcountl } */
> > > +/* { dg-options "-O2 -fdump-tree-optimized" } */
> > > +
> > > +#if __SIZEOF_LONG__ == 4
> > > +const unsigned long m1 = 0x55555555UL;
> > > +const unsigned long m2 = 0x33333333UL;
> > > +const unsigned long m4 = 0x0F0F0F0FUL;
> > > +const unsigned long h01 = 0x01010101UL;
> > > +const int shift = 24;
> > > +#else
> > > +const unsigned long m1 = 0x5555555555555555UL;
> > > +const unsigned long m2 = 0x3333333333333333UL;
> > > +const unsigned long m4 = 0x0f0f0f0f0f0f0f0fUL;
> > > +const unsigned long h01 = 0x0101010101010101UL;
> > > +const int shift = 56;
> > > +#endif
> > > +
> > > +
> > > +int popcount64c(unsigned long x)
> > > +{
> > > + x -= (x >> 1) & m1;
> > > + x = (x & m2) + ((x >> 2) & m2);
> > > + x = (x + (x >> 4)) & m4;
> > > + return (x * h01) >> shift;
> > > +}
> > > +
> > > +/* { dg-final { scan-tree-dump-times "__builtin_popcountl" 1 "optimized"
> > > } } */
> > > +
> > > +
> > > diff --git a/gcc/testsuite/gcc.dg/tree-ssa/popcount4ll.c
> > > b/gcc/testsuite/gcc.dg/tree-ssa/popcount4ll.c
> > > new file mode 100644
> > > index 0000000..f3755f1
> > > --- /dev/null
> > > +++ b/gcc/testsuite/gcc.dg/tree-ssa/popcount4ll.c
> > > @@ -0,0 +1,19 @@
> > > +/* { dg-do compile } */
> > > +/* { dg-require-effective-target popcountll } */
> > > +/* { dg-options "-O2 -fdump-tree-optimized" } */
> > > +
> > > +const unsigned long long m1 = 0x5555555555555555ULL;
> > > +const unsigned long long m2 = 0x3333333333333333ULL;
> > > +const unsigned long long m4 = 0x0F0F0F0F0F0F0F0FULL;
> > > +const unsigned long long h01 = 0x0101010101010101ULL;
> > > +const int shift = 56;
> > > +
> > > +int popcount64c(unsigned long long x)
> > > +{
> > > + x -= (x >> 1) & m1;
> > > + x = (x & m2) + ((x >> 2) & m2);
> > > + x = (x + (x >> 4)) & m4;
> > > + return (x * h01) >> shift;
> > > +}
> > > +
> > > +/* { dg-final { scan-tree-dump-times "__builtin_popcountll" 1
> > > "optimized" } } */
> > > diff --git a/gcc/testsuite/lib/target-supports.exp
> > > b/gcc/testsuite/lib/target-supports.exp
> > > index 3c50b89..32bbad7 100644
> > > --- a/gcc/testsuite/lib/target-supports.exp
> > > +++ b/gcc/testsuite/lib/target-supports.exp
> > > @@ -6855,6 +6855,29 @@ proc check_effective_target_popcountl { } {
> > > } "" ]
> > > }
> > >
> > > +# Return 1 if the target supports popcount on long long.
> > > +
> > > +proc check_effective_target_popcountll { } {
> > > + return [check_no_messages_and_pattern popcountll "!\\(call"
> > > rtl-expand {
> > > + int foo (long long b)
> > > + {
> > > + return __builtin_popcountll (b);
> > > + }
> > > + } "" ]
> > > +}
> > > +
> > > +
> > > +# Return 1 if the target supports popcount on int.
> > > +
> > > +proc check_effective_target_popcount { } {
> > > + return [check_no_messages_and_pattern popcount "!\\(call" rtl-expand
> > > {
> > > + int foo (int b)
> > > + {
> > > + return __builtin_popcount (b);
> > > + }
> > > + } "" ]
> > > +}
> > > +
> > > # Return 1 if the target supports atomic operations on "long long"
> > > # and can execute them.
> > > #
> >
>
> > diff --git a/gcc/match.pd b/gcc/match.pd
> > index 0317bc7..896d5b6 100644
> > --- a/gcc/match.pd
> > +++ b/gcc/match.pd
> > @@ -5358,6 +5358,69 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
> > (cmp (popcount @0) integer_zerop)
> > (rep @0 { build_zero_cst (TREE_TYPE (@0)); }))))
> >
> > +/* 64- and 32-bits branchless implementations of popcount are detected:
> > +
> > + int popcount64c (uint64_t x)
> > + {
> > + x -= (x >> 1) & 0x5555555555555555ULL;
> > + x = (x & 0x3333333333333333ULL) + ((x >> 2) & 0x3333333333333333ULL);
> > + x = (x + (x >> 4)) & 0x0f0f0f0f0f0f0f0fULL;
> > + return (x * 0x0101010101010101ULL) >> 56;
> > + }
> > +
> > + int popcount32c (uint32_t x)
> > + {
> > + x -= (x >> 1) & 0x55555555;
> > + x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
> > + x = (x + (x >> 4)) & 0x0f0f0f0f;
> > + return (x * 0x01010101) >> 24;
> > + } */
> > +(simplify
> > + (rshift
> > + (mult
> > + (bit_and
> > + (plus:c
> > + (rshift @8 INTEGER_CST@5)
> > + (plus:c@8
> > + (bit_and @6 INTEGER_CST@7)
> > + (bit_and
> > + (rshift
> > + (minus@6
> > + @0
> > + (bit_and
> > + (rshift @0 INTEGER_CST@4)
> > + INTEGER_CST@11))
> > + INTEGER_CST@10)
> > + INTEGER_CST@9)))
> > + INTEGER_CST@3)
> > + INTEGER_CST@2)
> > + INTEGER_CST@1)
> > + /* Check constants and optab. */
> > + (with
> > + {
> > + tree argtype = TREE_TYPE (@0);
> > + unsigned prec = TYPE_PRECISION (argtype);
> > + int shift = 64 - prec;
> > + const unsigned HOST_WIDE_INT c1 = 0x0101010101010101ULL >> shift,
> > + c2 = 0x0F0F0F0F0F0F0F0FULL >> shift,
> > + c3 = 0x3333333333333333ULL >> shift,
> > + c4 = 0x5555555555555555ULL >> shift;
> > + }
> > + (if (tree_to_uhwi (@4) == 1
> > + && tree_to_uhwi (@10) == 2 && tree_to_uhwi (@5) == 4
> > + && tree_to_uhwi (@1) == prec - 8 && tree_to_uhwi (@2) == c1
> > + && tree_to_uhwi (@3) == c2 && tree_to_uhwi (@9) == c3
> > + && tree_to_uhwi (@7) == c3 && tree_to_uhwi (@11) == c4
> > + && optab_handler (popcount_optab, TYPE_MODE (argtype))
> > + != CODE_FOR_nothing)
> > + (switch
> > + (if (types_match (argtype, long_long_unsigned_type_node))
> > + (convert (BUILT_IN_POPCOUNTLL:integer_type_node @0)))
> > + (if (types_match (argtype, long_unsigned_type_node))
> > + (convert (BUILT_IN_POPCOUNTL:integer_type_node @0)))
> > + (if (types_match (argtype, unsigned_type_node))
> > + (convert (BUILT_IN_POPCOUNT:integer_type_node @0)))))))
> > +
> > /* Simplify:
> >
> > a = a1 op a2
> > diff --git a/gcc/testsuite/gcc.dg/tree-ssa/popcount4.c
> > b/gcc/testsuite/gcc.dg/tree-ssa/popcount4.c
> > new file mode 100644
> > index 0000000..9f759f8
> > --- /dev/null
> > +++ b/gcc/testsuite/gcc.dg/tree-ssa/popcount4.c
> > @@ -0,0 +1,22 @@
> > +/* { dg-do compile } */
> > +/* { dg-require-effective-target popcount } */
> > +/* { dg-require-effective-target int32plus } */
> > +/* { dg-options "-O2 -fdump-tree-optimized" } */
> > +
> > +const unsigned m1 = 0x55555555UL;
> > +const unsigned m2 = 0x33333333UL;
> > +const unsigned m4 = 0x0F0F0F0FUL;
> > +const unsigned h01 = 0x01010101UL;
> > +const int shift = 24;
> > +
> > +int popcount64c(unsigned x)
> > +{
> > + x -= (x >> 1) & m1;
> > + x = (x & m2) + ((x >> 2) & m2);
> > + x = (x + (x >> 4)) & m4;
> > + return (x * h01) >> shift;
> > +}
> > +
> > +/* { dg-final { scan-tree-dump-times "__builtin_popcount" 1 "optimized" }
> > } */
> > +
> > +
> > diff --git a/gcc/testsuite/gcc.dg/tree-ssa/popcount4l.c
> > b/gcc/testsuite/gcc.dg/tree-ssa/popcount4l.c
> > new file mode 100644
> > index 0000000..ab33f79
> > --- /dev/null
> > +++ b/gcc/testsuite/gcc.dg/tree-ssa/popcount4l.c
> > @@ -0,0 +1,30 @@
> > +/* { dg-do compile } */
> > +/* { dg-require-effective-target popcountl } */
> > +/* { dg-options "-O2 -fdump-tree-optimized" } */
> > +
> > +#if __SIZEOF_LONG__ == 4
> > +const unsigned long m1 = 0x55555555UL;
> > +const unsigned long m2 = 0x33333333UL;
> > +const unsigned long m4 = 0x0F0F0F0FUL;
> > +const unsigned long h01 = 0x01010101UL;
> > +const int shift = 24;
> > +#else
> > +const unsigned long m1 = 0x5555555555555555UL;
> > +const unsigned long m2 = 0x3333333333333333UL;
> > +const unsigned long m4 = 0x0f0f0f0f0f0f0f0fUL;
> > +const unsigned long h01 = 0x0101010101010101UL;
> > +const int shift = 56;
> > +#endif
> > +
> > +
> > +int popcount64c(unsigned long x)
> > +{
> > + x -= (x >> 1) & m1;
> > + x = (x & m2) + ((x >> 2) & m2);
> > + x = (x + (x >> 4)) & m4;
> > + return (x * h01) >> shift;
> > +}
> > +
> > +/* { dg-final { scan-tree-dump-times "__builtin_popcountl" 1 "optimized" }
> > } */
> > +
> > +
> > diff --git a/gcc/testsuite/gcc.dg/tree-ssa/popcount4ll.c
> > b/gcc/testsuite/gcc.dg/tree-ssa/popcount4ll.c
> > new file mode 100644
> > index 0000000..f3755f1
> > --- /dev/null
> > +++ b/gcc/testsuite/gcc.dg/tree-ssa/popcount4ll.c
> > @@ -0,0 +1,19 @@
> > +/* { dg-do compile } */
> > +/* { dg-require-effective-target popcountll } */
> > +/* { dg-options "-O2 -fdump-tree-optimized" } */
> > +
> > +const unsigned long long m1 = 0x5555555555555555ULL;
> > +const unsigned long long m2 = 0x3333333333333333ULL;
> > +const unsigned long long m4 = 0x0F0F0F0F0F0F0F0FULL;
> > +const unsigned long long h01 = 0x0101010101010101ULL;
> > +const int shift = 56;
> > +
> > +int popcount64c(unsigned long long x)
> > +{
> > + x -= (x >> 1) & m1;
> > + x = (x & m2) + ((x >> 2) & m2);
> > + x = (x + (x >> 4)) & m4;
> > + return (x * h01) >> shift;
> > +}
> > +
> > +/* { dg-final { scan-tree-dump-times "__builtin_popcountll" 1 "optimized"
> > } } */
> > diff --git a/gcc/testsuite/lib/target-supports.exp
> > b/gcc/testsuite/lib/target-supports.exp
> > index 3c50b89..32bbad7 100644
> > --- a/gcc/testsuite/lib/target-supports.exp
> > +++ b/gcc/testsuite/lib/target-supports.exp
> > @@ -6855,6 +6855,29 @@ proc check_effective_target_popcountl { } {
> > } "" ]
> > }
> >
> > +# Return 1 if the target supports popcount on long long.
> > +
> > +proc check_effective_target_popcountll { } {
> > + return [check_no_messages_and_pattern popcountll "!\\(call" rtl-expand
> > {
> > + int foo (long long b)
> > + {
> > + return __builtin_popcountll (b);
> > + }
> > + } "" ]
> > +}
> > +
> > +
> > +# Return 1 if the target supports popcount on int.
> > +
> > +proc check_effective_target_popcount { } {
> > + return [check_no_messages_and_pattern popcount "!\\(call" rtl-expand {
> > + int foo (int b)
> > + {
> > + return __builtin_popcount (b);
> > + }
> > + } "" ]
> > +}
> > +
> > # Return 1 if the target supports atomic operations on "long long"
> > # and can execute them.
> > #
>
