diff options
| author | Yvan Roux <yvan.roux@linaro.org> | 2017-03-03 15:39:23 +0100 |
|---|---|---|
| committer | Yvan Roux <yvan.roux@linaro.org> | 2017-03-14 09:53:03 +0000 |
| commit | 231353fa1122ed89942a8e38b977517a6e4b5d99 (patch) | |
| tree | fff7a61dfd31e034827347370b31e34b1a1ea180 | |
| parent | b2d922ed729ecab6457e306783377399f2a88cfb (diff) | |
gcc/
Backport from trunk r245267.
2017-02-07 Andrew Pinski <apinski@cavium.com>
* config/aarch64/aarch64.md (popcount<mode>2): New pattern.
gcc/testsuite/
Backport from trunk r245267.
2017-02-07 Andrew Pinski <apinski@cavium.com>
* gcc.target/aarch64/popcount.c : New Testcase.
Change-Id: Iec549f39196b96849be3902de82e2a11398d07b1
| -rw-r--r-- | gcc/config/aarch64/aarch64.md | 33 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.target/aarch64/popcnt.c | 23 |
2 files changed, 56 insertions, 0 deletions
diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md index 957725758d1..75dab1d236d 100644 --- a/gcc/config/aarch64/aarch64.md +++ b/gcc/config/aarch64/aarch64.md @@ -3740,6 +3740,39 @@ } ) +;; Pop count be done via the "CNT" instruction in AdvSIMD. +;; +;; MOV v.1d, x0 +;; CNT v1.8b, v.8b +;; ADDV b2, v1.8b +;; MOV w0, v2.b[0] + +(define_expand "popcount<mode>2" + [(match_operand:GPI 0 "register_operand") + (match_operand:GPI 1 "register_operand")] + "TARGET_SIMD" +{ + rtx v = gen_reg_rtx (V8QImode); + rtx v1 = gen_reg_rtx (V8QImode); + rtx r = gen_reg_rtx (QImode); + rtx in = operands[1]; + rtx out = operands[0]; + if(<MODE>mode == SImode) + { + rtx tmp; + tmp = gen_reg_rtx (DImode); + /* If we have SImode, zero extend to DImode, pop count does + not change if we have extra zeros. */ + emit_insn (gen_zero_extendsidi2 (tmp, in)); + in = tmp; + } + emit_move_insn (v, gen_lowpart (V8QImode, in)); + emit_insn (gen_popcountv8qi2 (v1, v)); + emit_insn (gen_reduc_plus_scal_v8qi (r, v1)); + emit_insn (gen_zero_extendqi<mode>2 (out, r)); + DONE; +}) + (define_insn "clrsb<mode>2" [(set (match_operand:GPI 0 "register_operand" "=r") (clrsb:GPI (match_operand:GPI 1 "register_operand" "r")))] diff --git a/gcc/testsuite/gcc.target/aarch64/popcnt.c b/gcc/testsuite/gcc.target/aarch64/popcnt.c new file mode 100644 index 00000000000..7e957966d8e --- /dev/null +++ b/gcc/testsuite/gcc.target/aarch64/popcnt.c @@ -0,0 +1,23 @@ +/* { dg-do compile } */ +/* { dg-options "-O2" } */ + +int +foo (int x) +{ + return __builtin_popcount (x); +} + +long +foo1 (long x) +{ + return __builtin_popcountl (x); +} + +long long +foo2 (long long x) +{ + return __builtin_popcountll (x); +} + +/* { dg-final { scan-assembler-not "popcount" } } */ +/* { dg-final { scan-assembler-times "cnt\t" 3 } } */ |