* sh.md (insv): Provide byte offsets for gen_rtx_SUBREG.

	If input is constant, do shifts at compile time.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@49942 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index d97d28c..ebdb60a 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+Thu Feb 21 21:17:21 2002  J"orn Rennecke <joern.rennecke@superh.com>
+
+       * sh.md (insv): Provide byte offsets for gen_rtx_SUBREG.
+       If input is constant, do shifts at compile time.
+
 2002-02-21  Joseph S. Myers  <jsm28@cam.ac.uk>
 
        * doc/extend.texi: Fix some more overfull hboxes.

diff --git a/gcc/config/sh/sh.md b/gcc/config/sh/sh.md
index 263d9bd..072a33e 100644 (file)
--- a/gcc/config/sh/sh.md
+++ b/gcc/config/sh/sh.md
@@ -8336,37 +8336,53 @@
   "TARGET_SH1 && ! TARGET_LITTLE_ENDIAN"
   "
 {
-  rtx addr_target, orig_address, shift_reg;
-  HOST_WIDE_INT size;
+  rtx addr_target, orig_address, shift_reg, qi_val;
+  HOST_WIDE_INT bitsize, size, v;
+  rtx x = operands[3];
 
   /* ??? expmed doesn't care for non-register predicates.  */
   if (! memory_operand (operands[0], VOIDmode)
       || ! immediate_operand (operands[1], VOIDmode)
       || ! immediate_operand (operands[2], VOIDmode)
-      || ! general_operand (operands[3], VOIDmode))
+      || ! general_operand (x, VOIDmode))
     FAIL;
   /* If this isn't a 16 / 24 / 32 bit field, or if
      it doesn't start on a byte boundary, then fail.  */
-  size = INTVAL (operands[1]);
-  if (size < 16 || size > 32 || size % 8 != 0
+  bitsize = INTVAL (operands[1]);
+  if (bitsize < 16 || bitsize > 32 || bitsize % 8 != 0
       || (INTVAL (operands[2]) % 8) != 0)
     FAIL;
 
-  size /= 8;
+  size = bitsize / 8;
   orig_address = XEXP (operands[0], 0);
   shift_reg = gen_reg_rtx (SImode);
-  emit_insn (gen_movsi (shift_reg, operands[3]));
+  if (GET_CODE (x) == CONST_INT)
+    {
+      v = INTVAL (x);
+      qi_val = force_reg (QImode, GEN_INT (trunc_int_for_mode (v, QImode)));
+    }
+  else
+    {
+      emit_insn (gen_movsi (shift_reg, operands[3]));
+      qi_val = gen_rtx_SUBREG (QImode, shift_reg, 3);
+    }
   addr_target = copy_addr_to_reg (plus_constant (orig_address, size - 1));
 
   operands[0] = replace_equiv_address (operands[0], addr_target);
-  emit_insn (gen_movqi (operands[0], gen_rtx_SUBREG (QImode, shift_reg, 0)));
+  emit_insn (gen_movqi (operands[0], qi_val));
 
   while (size -= 1)
     {
-      emit_insn (gen_lshrsi3_k (shift_reg, shift_reg, GEN_INT (8)));
+      if (GET_CODE (x) == CONST_INT)
+       qi_val
+         = force_reg (QImode, GEN_INT (trunc_int_for_mode (v >>= 8, QImode)));
+      else
+       {
+         emit_insn (gen_lshrsi3_k (shift_reg, shift_reg, GEN_INT (8)));
+         qi_val = gen_rtx_SUBREG (QImode, shift_reg, 3);
+       }
       emit_insn (gen_addsi3 (addr_target, addr_target, GEN_INT (-1)));
-      emit_insn (gen_movqi (operands[0],
-                           gen_rtx_SUBREG (QImode, shift_reg, 0)));
+      emit_insn (gen_movqi (operands[0], qi_val));
     }
 
   DONE;