diff mbox series

nvptx: Add support for PTX highpart multiplications (e.g. mul.hi.s32)

Message ID 001301d66a59$93af4860$bb0dd920$@nextmovesoftware.com
State New
Headers show
Series nvptx: Add support for PTX highpart multiplications (e.g. mul.hi.s32) | expand

Commit Message

Roger Sayle Aug. 4, 2020, 12:20 p.m. UTC 
This patch adds support for signed and unsigned, HImode, SImode and
DImode highpart multiplications to the nvptx backend.  Without the
middle-end patch that I've just posted, the middle-end is able to
(easily) make use of the narrow four of the six instructions, but
with that patch, all six of these instructions are generated in the
provided test cases.

This patch has been tested on nvptx-none hosted on x86_64-pc-linux-gnu
with a "make" and "make -k check" with no new failures with the
above patch, and just the two failures to find mul.hi.?64 against
current mainline.  I'd considered submitting this patch either without
support for the 64bit variants, or without tests for them, but it
seemed more reasonable to make both enhancements at the same time.

Ok for mainline (once the previous patch has been approved/pushed)?


2020-08-04  Roger Sayle  <roger@nextmovesoftware.com>

gcc/ChangeLog
	* config/nvptx/nvptx.md (smulhi3_highpart, smulsi3_highpart,
	smuldi4_highpart, umulhi3_highpart, umulsi3_highpart,
	umuldi3_highpart): New instructions.

gcc/testsuite/ChangeLog
	* gcc.target/nvptx/mul-hi.c: New test.
	* gcc.target/nvptx/umul-hi.c: New test.


Thanks in advance,
Roger
--
Roger Sayle
NextMove Software
Cambridge, UK

diff --git a/gcc/testsuite/gcc.target/nvptx/mul-hi.c b/gcc/testsuite/gcc.target/nvptx/mul-hi.c
new file mode 100644
index 0000000..2cc35af
--- /dev/null
+++ b/gcc/testsuite/gcc.target/nvptx/mul-hi.c
@@ -0,0 +1,23 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -Wno-long-long" } */
+
+typedef int __attribute ((mode(TI))) ti_t;
+
+short smulhi3_highpart(short x, short y)
+{
+  return ((int)x * (int)y) >> 16;
+}
+
+int smulsi3_highpart(int x, int y)
+{
+  return ((long)x * (long)y) >> 32;
+}
+
+long smuldi3_highpart(long x, long y)
+{
+  return ((ti_t)x * (ti_t)y) >> 64;
+}
+
+/* { dg-final { scan-assembler-times "mul.hi.s16" 1 } } */
+/* { dg-final { scan-assembler-times "mul.hi.s32" 1 } } */
+/* { dg-final { scan-assembler-times "mul.hi.s64" 1 } } */
diff --git a/gcc/testsuite/gcc.target/nvptx/umul-hi.c b/gcc/testsuite/gcc.target/nvptx/umul-hi.c
new file mode 100644
index 0000000..148d1ce
--- /dev/null
+++ b/gcc/testsuite/gcc.target/nvptx/umul-hi.c
@@ -0,0 +1,23 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -Wno-long-long" } */
+
+typedef unsigned int __attribute ((mode(TI))) uti_t;
+
+unsigned short umulhi3_highpart(unsigned short x, unsigned short y)
+{
+  return ((unsigned int)x * (unsigned int)y) >> 16;
+}
+
+unsigned int umulsi3_highpart(unsigned int x, unsigned int y)
+{
+  return ((unsigned long)x * (unsigned long)y) >> 32;
+}
+
+unsigned long umuldi3_highpart(unsigned long x, unsigned long y)
+{
+  return ((uti_t)x * (uti_t)y) >> 64;
+}
+
+/* { dg-final { scan-assembler-times "mul.hi.u16" 1 } } */
+/* { dg-final { scan-assembler-times "mul.hi.u32" 1 } } */
+/* { dg-final { scan-assembler-times "mul.hi.u64" 1 } } */

Comments

Tom de Vries Aug. 4, 2020, 10:48 p.m. UTC | #1 
On 8/4/20 2:20 PM, Roger Sayle wrote:
> 
> This patch adds support for signed and unsigned, HImode, SImode and
> DImode highpart multiplications to the nvptx backend.  Without the
> middle-end patch that I've just posted, the middle-end is able to
> (easily) make use of the narrow four of the six instructions, but
> with that patch, all six of these instructions are generated in the
> provided test cases.
> 
> This patch has been tested on nvptx-none hosted on x86_64-pc-linux-gnu
> with a "make" and "make -k check" with no new failures with the
> above patch, and just the two failures to find mul.hi.?64 against
> current mainline.  I'd considered submitting this patch either without
> support for the 64bit variants, or without tests for them, but it
> seemed more reasonable to make both enhancements at the same time.
> 
> Ok for mainline (once the previous patch has been approved/pushed)?

I've committed the HImode/SImode part of the patches (as attached below).

DImode part is OK once the respective tests starts passing.

Thanks,
- Tom
diff mbox series

Patch

diff --git a/gcc/config/nvptx/nvptx.md b/gcc/config/nvptx/nvptx.md
index c23edcf..0459549 100644
--- a/gcc/config/nvptx/nvptx.md
+++ b/gcc/config/nvptx/nvptx.md
@@ -568,6 +568,78 @@ 
   ""
   "%.\\tmul.wide.u32\\t%0, %1, %2;")
 
+(define_insn "smulhi3_highpart"
+  [(set (match_operand:HI 0 "nvptx_register_operand" "=R")
+	(truncate:HI
+	 (lshiftrt:SI
+	  (mult:SI (sign_extend:SI
+		    (match_operand:HI 1 "nvptx_register_operand" "R"))
+		   (sign_extend:SI
+		    (match_operand:HI 2 "nvptx_register_operand" "R")))
+	  (const_int 16))))]
+  ""
+  "%.\\tmul.hi.s16\\t%0, %1, %2;")
+
+(define_insn "smulsi3_highpart"
+  [(set (match_operand:SI 0 "nvptx_register_operand" "=R")
+	(truncate:SI
+	 (lshiftrt:DI
+	  (mult:DI (sign_extend:DI
+		    (match_operand:SI 1 "nvptx_register_operand" "R"))
+		   (sign_extend:DI
+		    (match_operand:SI 2 "nvptx_register_operand" "R")))
+	  (const_int 32))))]
+  ""
+  "%.\\tmul.hi.s32\\t%0, %1, %2;")
+
+(define_insn "smuldi3_highpart"
+  [(set (match_operand:DI 0 "nvptx_register_operand" "=R")
+	(truncate:DI
+	 (lshiftrt:TI
+	  (mult:TI (sign_extend:TI
+		    (match_operand:DI 1 "nvptx_register_operand" "R"))
+		   (sign_extend:TI
+		    (match_operand:DI 2 "nvptx_register_operand" "R")))
+	  (const_int 64))))]
+  ""
+  "%.\\tmul.hi.s64\\t%0, %1, %2;")
+
+(define_insn "umulhi3_highpart"
+  [(set (match_operand:HI 0 "nvptx_register_operand" "=R")
+	(truncate:HI
+	 (lshiftrt:SI
+	  (mult:SI (zero_extend:SI
+		    (match_operand:HI 1 "nvptx_register_operand" "R"))
+		   (zero_extend:SI
+		    (match_operand:HI 2 "nvptx_register_operand" "R")))
+	  (const_int 16))))]
+  ""
+  "%.\\tmul.hi.u16\\t%0, %1, %2;")
+
+(define_insn "umulsi3_highpart"
+  [(set (match_operand:SI 0 "nvptx_register_operand" "=R")
+	(truncate:SI
+	 (lshiftrt:DI
+	  (mult:DI (zero_extend:DI
+		    (match_operand:SI 1 "nvptx_register_operand" "R"))
+		   (zero_extend:DI
+		    (match_operand:SI 2 "nvptx_register_operand" "R")))
+	  (const_int 32))))]
+  ""
+  "%.\\tmul.hi.u32\\t%0, %1, %2;")
+
+(define_insn "umuldi3_highpart"
+  [(set (match_operand:DI 0 "nvptx_register_operand" "=R")
+	(truncate:DI
+	 (lshiftrt:TI
+	  (mult:TI (zero_extend:TI
+		    (match_operand:DI 1 "nvptx_register_operand" "R"))
+		   (zero_extend:TI
+		    (match_operand:DI 2 "nvptx_register_operand" "R")))
+	  (const_int 64))))]
+  ""
+  "%.\\tmul.hi.u64\\t%0, %1, %2;")
+
 ;; Shifts
 
 (define_insn "ashl<mode>3"