From 6db9d068e32a424ac04c27e963d1e58cb3ef8bdf Mon Sep 17 00:00:00 2001
From: Mahesh Bodapati <mbodapat@xilinx.com>
Date: Tue, 17 Jan 2017 15:23:57 +0530
Subject: [PATCH 18/63] [Patch, microblaze]: Add optimized lshrsi3 When barrel
 shifter is not present, the immediate value is greater than #5 and
 optimization is -OS, the compiler will generate shift operation using loop.

Changelog

2013-11-26  David Holsgrove <david.holsgrove@xilinx.com>

 * gcc/config/microblaze/microblaze.md: Add size optimized lshrsi3 insn

ChangeLog/testsuite

2014-02-12  David Holsgrove <david.holsgrove@xilinx.com>

 * gcc/testsuite/gcc.target/microblaze/others/lshrsi_Os_1.c: New test.

Signed-off-by:Nagaraju <nmekala@xilix.com>
Signed-off-by: David Holsgrove <david.holsgrove@xilinx.com>
---
 gcc/config/microblaze/microblaze.md                 | 21 +++++++++++++++++++++
 .../gcc.target/microblaze/others/lshrsi_Os_1.c      | 13 +++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/microblaze/others/lshrsi_Os_1.c

diff --git a/gcc/config/microblaze/microblaze.md b/gcc/config/microblaze/microblaze.md
index 3d2636e..aa2eda3 100644
--- a/gcc/config/microblaze/microblaze.md
+++ b/gcc/config/microblaze/microblaze.md
@@ -1618,6 +1618,27 @@
   (set_attr "length"	"4,4")]
 )
 
+(define_insn "*lshrsi3_with_size_opt"
+  [(set (match_operand:SI 0 "register_operand" "=&d")
+       (lshiftrt:SI (match_operand:SI 1 "register_operand"  "d")
+                   (match_operand:SI 2 "immediate_operand" "I")))]
+  "(INTVAL (operands[2]) > 5 && optimize_size)"
+  {
+    operands[3] = gen_rtx_REG (SImode, MB_ABI_ASM_TEMP_REGNUM);
+
+    output_asm_insn ("ori\t%3,r0,%2", operands);
+    if (REGNO (operands[0]) != REGNO (operands[1]))
+        output_asm_insn ("addk\t%0,%1,r0", operands);
+
+    output_asm_insn ("addik\t%3,%3,-1", operands);
+    output_asm_insn ("bneid\t%3,.-4", operands);
+    return "srl\t%0,%0";
+  }
+  [(set_attr "type"    "multi")
+  (set_attr "mode"    "SI")
+  (set_attr "length"  "20")]
+)
+
 (define_insn "*lshrsi_inline"
   [(set (match_operand:SI 0 "register_operand" "=&d")
        (lshiftrt:SI (match_operand:SI 1 "register_operand"  "d")
diff --git a/gcc/testsuite/gcc.target/microblaze/others/lshrsi_Os_1.c b/gcc/testsuite/gcc.target/microblaze/others/lshrsi_Os_1.c
new file mode 100644
index 0000000..32a3be7
--- /dev/null
+++ b/gcc/testsuite/gcc.target/microblaze/others/lshrsi_Os_1.c
@@ -0,0 +1,13 @@
+/* { dg-options "-Os -mno-xl-barrel-shift" } */
+
+void testfunc(void)
+{
+    unsigned volatile int z = 8192;
+    z >>= 8;
+}
+/* { dg-final { scan-assembler-not "\bsrli" } } */
+/* { dg-final { scan-assembler "\ori\tr18,r0" } } */
+/* { dg-final { scan-assembler "addk\tr(\[0-9]\|\[1-2]\[0-9]\|3\[0-1]),r(\[0-9]\|\[1-2]\[0-9]\|3\[0-1]),r0" } } */
+/* { dg-final { scan-assembler "addik\tr18,r18,-1" } } */
+/* { dg-final { scan-assembler "bneid\tr18,.-4" } } */
+/* { dg-final { scan-assembler "\srl\tr(\[0-9]\|\[1-2]\[0-9]\|3\[0-1]),r(\[0-9]\|\[1-2]\[0-9]\|3\[0-1])" } } */
-- 
2.7.4