[PATCH] RISC-V missing __builtin_lceil and __builtin_lfloor

[Kevin Lee <kevinl@rivosinc.com>]

Hello,
Currently, __builtin_lceil and __builtin_lfloor doesn't generate an
existing instruction fcvt, but rather calls ceil and floor from the
library. This patch adds the missing iterator and attributes for lceil and
lfloor to produce the optimized code.
 The test cases check the correct generation of the fcvt instruction for
float/double to int/long/long long. Passed the test in riscv-linux.
Could this patch be committed?

gcc/ChangeLog:
       Michael Collison  <collison@rivosinc.com>
        * config/riscv/riscv.md (RINT): Add iterator for lceil and lround.
        (rint_pattern): Add ceil and floor.
        (rint_rm): Add rup and rdn.

gcc/testsuite/ChangeLog:
        Kevin Lee  <kevinl@rivosinc.com>
        * gcc.target/riscv/lfloor-lceil.c: New test.
---
 gcc/config/riscv/riscv.md                     | 13 ++-
 gcc/testsuite/gcc.target/riscv/lfloor-lceil.c | 79 +++++++++++++++++++
 2 files changed, 88 insertions(+), 4 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/riscv/lfloor-lceil.c

diff --git a/gcc/config/riscv/riscv.md b/gcc/config/riscv/riscv.md
index c6399b1389e..070004fa7fe 100644
--- a/gcc/config/riscv/riscv.md
+++ b/gcc/config/riscv/riscv.md
@@ -43,6 +43,9 @@ (define_c_enum "unspec" [
   UNSPEC_LRINT
   UNSPEC_LROUND

+  UNSPEC_LCEIL
+  UNSPEC_LFLOOR
+
   ;; Stack tie
   UNSPEC_TIE
 ])
@@ -345,10 +348,12 @@ (define_mode_attr UNITMODE [(SF "SF") (DF "DF")])
 ;; the controlling mode.
 (define_mode_attr HALFMODE [(DF "SI") (DI "SI") (TF "DI")])

-;; Iterator and attributes for floating-point rounding instructions.
-(define_int_iterator RINT [UNSPEC_LRINT UNSPEC_LROUND])
-(define_int_attr rint_pattern [(UNSPEC_LRINT "rint") (UNSPEC_LROUND
"round")])
-(define_int_attr rint_rm [(UNSPEC_LRINT "dyn") (UNSPEC_LROUND "rmm")])
+;; Iterator and attributes for floating-point rounding instructions.f
+(define_int_iterator RINT [UNSPEC_LRINT UNSPEC_LROUND UNSPEC_LCEIL
UNSPEC_LFLOOR])
+(define_int_attr rint_pattern [(UNSPEC_LRINT "rint") (UNSPEC_LROUND
"round")
+                             (UNSPEC_LCEIL "ceil") (UNSPEC_LFLOOR
"floor")])
+(define_int_attr rint_rm [(UNSPEC_LRINT "dyn") (UNSPEC_LROUND "rmm")
+                        (UNSPEC_LCEIL "rup") (UNSPEC_LFLOOR "rdn")])

 ;; Iterator and attributes for quiet comparisons.
 (define_int_iterator QUIET_COMPARISON [UNSPEC_FLT_QUIET UNSPEC_FLE_QUIET])
diff --git a/gcc/testsuite/gcc.target/riscv/lfloor-lceil.c
b/gcc/testsuite/gcc.target/riscv/lfloor-lceil.c
new file mode 100644
index 00000000000..4d81c12cefa
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/lfloor-lceil.c
@@ -0,0 +1,79 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc -mabi=lp64d" } */
+/* { dg-skip-if "" { *-*-* } { "-O0" "-Og" } } */
+
+int
+ceil1(float i)
+{
+  return __builtin_lceil(i);
+}
+
+long
+ceil2(float i)
+{
+  return __builtin_lceil(i);
+}
+
+long long
+ceil3(float i)
+{
+  return __builtin_lceil(i);
+}
+
+int
+ceil4(double i)
+{
+  return __builtin_lceil(i);
+}
+
+long
+ceil5(double i)
+{
+  return __builtin_lceil(i);
+}
+
+long long
+ceil6(double i)
+{
+  return __builtin_lceil(i);
+}
+
+int
+floor1(float i)
+{
+  return __builtin_lfloor(i);
+}
+
+long
+floor2(float i)
+{
+  return __builtin_lfloor(i);
+}
+
+long long
+floor3(float i)
+{
+  return __builtin_lfloor(i);
+}
+
+int
+floor4(double i)
+{
+  return __builtin_lfloor(i);
+}
+
+long
+floor5(double i)
+{
+  return __builtin_lfloor(i);
+}
+
+long long
+floor6(double i)
+{
+  return __builtin_lfloor(i);
+}
+
+/* { dg-final { scan-assembler-times "fcvt.l.s" 6 } } */
+/* { dg-final { scan-assembler-times "fcvt.l.d" 6 } } */
+/* { dg-final { scan-assembler-not "call" } } */
-- 
2.25.1