This allows to optimize the following builtins if -fno-math-errno:
- __builtin_lrint{,f}
- __builtin_lfloor{,f}
- __builtin_lceil{,f}
Inspired by
https://gcc.gnu.org/pipermail/gcc-patches/2022-November/605287.html.
ANYFI is added so the compiler won't try ftint.l.s if -mfpu=32. If we
simply used GPR here an ICE would be triggered with __builtin_lrintf
and -mfpu=32.
ftint{rm,rp} instructions may raise inexact exception, so they can't be
used if -fno-trapping-math -fno-fp-int-builtin-inexact.
Note that the .w.{s,d} variants are not tested because we don't support
ILP32 for now.
gcc/ChangeLog:
* config/loongarch/loongarch.md (UNSPEC_FTINT): New unspec.
(UNSPEC_FTINTRM): Likewise.
(UNSPEC_FTINTRP): Likewise.
(LRINT): New define_int_iterator.
(lrint_pattern): New define_int_attr.
(lrint_submenmonic): Likewise.
(lrint_allow_inexact): Likewise.
(ANYFI): New define_mode_iterator.
(lrint<ANYF><ANYFI>): New instruction template.
gcc/testsuite/ChangeLog:
* gcc.target/loongarch/ftint.c: New test.
* gcc.target/loongarch/ftint-no-inexact.c: New test.
---
gcc/config/loongarch/loongarch.md | 34 ++++++++++++++
.../gcc.target/loongarch/ftint-no-inexact.c | 44 +++++++++++++++++++
gcc/testsuite/gcc.target/loongarch/ftint.c | 44 +++++++++++++++++++
3 files changed, 122 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/loongarch/ftint-no-inexact.c
create mode 100644 gcc/testsuite/gcc.target/loongarch/ftint.c
diff --git a/gcc/config/loongarch/loongarch.md
b/gcc/config/loongarch/loongarch.md
index a14ab14ac24..eb127c346a3 100644
--- a/gcc/config/loongarch/loongarch.md
+++ b/gcc/config/loongarch/loongarch.md
@@ -38,6 +38,9 @@ (define_c_enum "unspec" [
UNSPEC_FMAX
UNSPEC_FMIN
UNSPEC_FCOPYSIGN
+ UNSPEC_FTINT
+ UNSPEC_FTINTRM
+ UNSPEC_FTINTRP
;; Override return address for exception handling.
UNSPEC_EH_RETURN
@@ -374,6 +377,11 @@ (define_mode_iterator QHWD [QI HI SI (DI "TARGET_64BIT")])
(define_mode_iterator ANYF [(SF "TARGET_HARD_FLOAT")
(DF "TARGET_DOUBLE_FLOAT")])
+;; Iterator for fixed-point modes which can be hold by a hardware
+;; floating-point register.
+(define_mode_iterator ANYFI [(SI "TARGET_HARD_FLOAT")
+ (DI "TARGET_DOUBLE_FLOAT")])
+
;; A mode for which moves involving FPRs may need to be split.
(define_mode_iterator SPLITF
[(DF "!TARGET_64BIT && TARGET_DOUBLE_FLOAT")
@@ -515,6 +523,19 @@ (define_code_attr fcond [(unordered "cun")
(define_code_attr sel [(eq "masknez") (ne "maskeqz")])
(define_code_attr selinv [(eq "maskeqz") (ne "masknez")])
+;; Iterator and attributes for floating-point to fixed-point conversion
+;; instructions.
+(define_int_iterator LRINT [UNSPEC_FTINT UNSPEC_FTINTRM UNSPEC_FTINTRP])
+(define_int_attr lrint_pattern [(UNSPEC_FTINT "lrint")
+ (UNSPEC_FTINTRM "lfloor")
+ (UNSPEC_FTINTRP "lceil")])
+(define_int_attr lrint_submenmonic [(UNSPEC_FTINT "")
+ (UNSPEC_FTINTRM "rm")
+ (UNSPEC_FTINTRP "rp")])
+(define_int_attr lrint_allow_inexact [(UNSPEC_FTINT "1")
+ (UNSPEC_FTINTRM "0")
+ (UNSPEC_FTINTRP "0")])
+
;;
;; ....................
;;
@@ -2022,6 +2043,19 @@ (define_insn "rint<mode>2"
[(set_attr "type" "fcvt")
(set_attr "mode" "<MODE>")])
+;; Convert floating-point numbers to integers
+(define_insn "<lrint_pattern><ANYF:mode><ANYFI:mode>2"
+ [(set (match_operand:ANYFI 0 "register_operand" "=f")
+ (unspec:ANYFI [(match_operand:ANYF 1 "register_operand" "f")]
+ LRINT))]
+ "TARGET_HARD_FLOAT &&
+ (<lrint_allow_inexact>
+ || flag_fp_int_builtin_inexact
+ || !flag_trapping_math)"
+ "ftint<lrint_submenmonic>.<ANYFI:ifmt>.<ANYF:fmt> %0,%1"
+ [(set_attr "type" "fcvt")
+ (set_attr "mode" "<ANYF:MODE>")])
+
;; Load the low word of operand 0 with operand 1.
(define_insn "load_low<mode>"
[(set (match_operand:SPLITF 0 "register_operand" "=f,f")
diff --git a/gcc/testsuite/gcc.target/loongarch/ftint-no-inexact.c
b/gcc/testsuite/gcc.target/loongarch/ftint-no-inexact.c
new file mode 100644
index 00000000000..88b83a9c056
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/ftint-no-inexact.c
@@ -0,0 +1,44 @@
+/* { dg-do compile } */
+/* { dg-options "-mabi=lp64d -mdouble-float -fno-math-errno
-fno-fp-int-builtin-inexact" } */
+/* { dg-final { scan-assembler "ftint\\.l\\.s" } } */
+/* { dg-final { scan-assembler "ftint\\.l\\.d" } } */
+/* { dg-final { scan-assembler-not "ftintrm\\.l\\.s" } } */
+/* { dg-final { scan-assembler-not "ftintrm\\.l\\.d" } } */
+/* { dg-final { scan-assembler-not "ftintrp\\.l\\.s" } } */
+/* { dg-final { scan-assembler-not "ftintrp\\.l\\.d" } } */
+
+long
+my_lrint (double a)
+{
+ return __builtin_lrint (a);
+}
+
+long
+my_lrintf (float a)
+{
+ return __builtin_lrintf (a);
+}
+
+long
+my_lfloor (double a)
+{
+ return __builtin_lfloor (a);
+}
+
+long
+my_lfloorf (float a)
+{
+ return __builtin_lfloorf (a);
+}
+
+long
+my_lceil (double a)
+{
+ return __builtin_lceil (a);
+}
+
+long
+my_lceilf (float a)
+{
+ return __builtin_lceilf (a);
+}
diff --git a/gcc/testsuite/gcc.target/loongarch/ftint.c
b/gcc/testsuite/gcc.target/loongarch/ftint.c
new file mode 100644
index 00000000000..7a326a454d8
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/ftint.c
@@ -0,0 +1,44 @@
+/* { dg-do compile } */
+/* { dg-options "-mabi=lp64d -mdouble-float -fno-math-errno
-ffp-int-builtin-inexact" } */
+/* { dg-final { scan-assembler "ftint\\.l\\.s" } } */
+/* { dg-final { scan-assembler "ftint\\.l\\.d" } } */
+/* { dg-final { scan-assembler "ftintrm\\.l\\.s" } } */
+/* { dg-final { scan-assembler "ftintrm\\.l\\.d" } } */
+/* { dg-final { scan-assembler "ftintrp\\.l\\.s" } } */
+/* { dg-final { scan-assembler "ftintrp\\.l\\.d" } } */
+
+long
+my_lrint (double a)
+{
+ return __builtin_lrint (a);
+}
+
+long
+my_lrintf (float a)
+{
+ return __builtin_lrintf (a);
+}
+
+long
+my_lfloor (double a)
+{
+ return __builtin_lfloor (a);
+}
+
+long
+my_lfloorf (float a)
+{
+ return __builtin_lfloorf (a);
+}
+
+long
+my_lceil (double a)
+{
+ return __builtin_lceil (a);
+}
+
+long
+my_lceilf (float a)
+{
+ return __builtin_lceilf (a);
+}
--
2.38.1
