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* [gcc r12-7368] [nvptx] Add shf.{l,r}.wrap insn
@ 2022-02-24 8:20 Tom de Vries
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From: Tom de Vries @ 2022-02-24 8:20 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:c982d02ffe26fcd07280bf0f35f90df9be00716e
commit r12-7368-gc982d02ffe26fcd07280bf0f35f90df9be00716e
Author: Tom de Vries <tdevries@suse.de>
Date: Wed Feb 23 09:39:53 2022 +0100
[nvptx] Add shf.{l,r}.wrap insn
Ptx contains funnel shift operations shf.l.wrap and shf.r.wrap that can be
used to implement 32-bit left or right rotate.
Add define_insns rotlsi3 and rotrsi3.
Tested on nvptx.
gcc/ChangeLog:
2022-02-23 Tom de Vries <tdevries@suse.de>
* config/nvptx/nvptx.md (define_insn "rotlsi3", define_insn
"rotrsi3"): New define_insn.
gcc/testsuite/ChangeLog:
2022-02-23 Tom de Vries <tdevries@suse.de>
* gcc.target/nvptx/rotate-run.c: New test.
* gcc.target/nvptx/rotate.c: New test.
Diff:
---
gcc/config/nvptx/nvptx.md | 16 ++++++++++++++++
gcc/testsuite/gcc.target/nvptx/rotate-run.c | 23 +++++++++++++++++++++++
gcc/testsuite/gcc.target/nvptx/rotate.c | 20 ++++++++++++++++++++
3 files changed, 59 insertions(+)
diff --git a/gcc/config/nvptx/nvptx.md b/gcc/config/nvptx/nvptx.md
index 216e89f230a..4989b5642e2 100644
--- a/gcc/config/nvptx/nvptx.md
+++ b/gcc/config/nvptx/nvptx.md
@@ -808,6 +808,22 @@
""
"%.\\tshr.u%T0\\t%0, %1, %2;")
+(define_insn "rotlsi3"
+ [(set (match_operand:SI 0 "nvptx_register_operand" "=R")
+ (rotate:SI (match_operand:SI 1 "nvptx_register_operand" "R")
+ (and:SI (match_operand:SI 2 "nvptx_nonmemory_operand" "Ri")
+ (const_int 31))))]
+ "TARGET_SM35"
+ "%.\\tshf.l.wrap.b32\\t%0, %1, %1, %2;")
+
+(define_insn "rotrsi3"
+ [(set (match_operand:SI 0 "nvptx_register_operand" "=R")
+ (rotatert:SI (match_operand:SI 1 "nvptx_register_operand" "R")
+ (and:SI (match_operand:SI 2 "nvptx_nonmemory_operand" "Ri")
+ (const_int 31))))]
+ "TARGET_SM35"
+ "%.\\tshf.r.wrap.b32\\t%0, %1, %1, %2;")
+
;; Logical operations
(define_code_iterator any_logic [and ior xor])
diff --git a/gcc/testsuite/gcc.target/nvptx/rotate-run.c b/gcc/testsuite/gcc.target/nvptx/rotate-run.c
new file mode 100644
index 00000000000..14cb6f8b0b3
--- /dev/null
+++ b/gcc/testsuite/gcc.target/nvptx/rotate-run.c
@@ -0,0 +1,23 @@
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+#include "rotate.c"
+
+#define ASSERT(EXPR) \
+ do \
+ { \
+ if (!(EXPR)) \
+ __builtin_abort (); \
+ } while (0)
+
+int
+main (void)
+{
+ ASSERT (rotl (0x12345678, 8) == 0x34567812);
+ ASSERT (rotl (0x12345678, 8 + 32) == 0x34567812);
+
+ ASSERT (rotr (0x12345678, 8) == 0x78123456);
+ ASSERT (rotr (0x12345678, 8 + 32) == 0x78123456);
+
+ return 0;
+}
diff --git a/gcc/testsuite/gcc.target/nvptx/rotate.c b/gcc/testsuite/gcc.target/nvptx/rotate.c
new file mode 100644
index 00000000000..1c9b83b4809
--- /dev/null
+++ b/gcc/testsuite/gcc.target/nvptx/rotate.c
@@ -0,0 +1,20 @@
+/* { dg-do assemble } */
+/* { dg-options "-O2 -save-temps" } */
+
+#define MASK 0x1f
+
+unsigned int
+rotl (unsigned int val, unsigned int cnt) {
+ cnt &= MASK;
+ return (val << cnt) | (val >> (-cnt & MASK));
+}
+
+unsigned int
+rotr (unsigned int val, unsigned int cnt) {
+ cnt &= MASK;
+ return (val >> cnt) | (val << (-cnt & MASK));
+}
+
+/* { dg-final { scan-assembler-times "shf.l.wrap.b32" 1 } } */
+/* { dg-final { scan-assembler-times "shf.r.wrap.b32" 1 } } */
+/* { dg-final { scan-assembler-not "and.b32" } } */
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