poly_int: instantiate_virtual_regs

This patch makes the instantiate virtual regs pass track offsets
as poly_ints.

2017-12-21  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* function.c (in_arg_offset, var_offset, dynamic_offset)
	(out_arg_offset, cfa_offset): Change from int to poly_int64.
	(instantiate_new_reg): Return the new offset as a poly_int64_pod
	rather than a HOST_WIDE_INT.
	(instantiate_virtual_regs_in_rtx): Track polynomial offsets.
	(instantiate_virtual_regs_in_insn): Likewise.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>
From-SVN: r255920

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 40d62bf9ed679942d74ca583c35bf1cf46a3cbcb..2d682556a80e522d6a80c7094ae0d6b4fb1034e0 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,14 @@
+2017-12-21  Richard Sandiford  <richard.sandiford@linaro.org>
+           Alan Hayward  <alan.hayward@arm.com>
+           David Sherwood  <david.sherwood@arm.com>
+
+       * function.c (in_arg_offset, var_offset, dynamic_offset)
+       (out_arg_offset, cfa_offset): Change from int to poly_int64.
+       (instantiate_new_reg): Return the new offset as a poly_int64_pod
+       rather than a HOST_WIDE_INT.
+       (instantiate_virtual_regs_in_rtx): Track polynomial offsets.
+       (instantiate_virtual_regs_in_insn): Likewise.
+
 2017-12-21  Richard Sandiford  <richard.sandiford@linaro.org>
            Alan Hayward  <alan.hayward@arm.com>
            David Sherwood  <david.sherwood@arm.com>

diff --git a/gcc/function.c b/gcc/function.c
index 743d4211b3c21518605f1d04c7f5df84e4fb1517..e479b1e5686fe004972d23922e66695cb165dcce 100644 (file)
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -1367,11 +1367,11 @@ initial_value_entry (int i, rtx *hreg, rtx *preg)
    routines.  They contain the offsets of the virtual registers from their
    respective hard registers.  */
 
-static int in_arg_offset;
-static int var_offset;
-static int dynamic_offset;
-static int out_arg_offset;
-static int cfa_offset;
+static poly_int64 in_arg_offset;
+static poly_int64 var_offset;
+static poly_int64 dynamic_offset;
+static poly_int64 out_arg_offset;
+static poly_int64 cfa_offset;
 
 /* In most machines, the stack pointer register is equivalent to the bottom
    of the stack.  */
@@ -1418,10 +1418,10 @@ static int cfa_offset;
    offset indirectly through the pointer.  Otherwise, return 0.  */
 
 static rtx
-instantiate_new_reg (rtx x, HOST_WIDE_INT *poffset)
+instantiate_new_reg (rtx x, poly_int64_pod *poffset)
 {
   rtx new_rtx;
-  HOST_WIDE_INT offset;
+  poly_int64 offset;
 
   if (x == virtual_incoming_args_rtx)
     {
@@ -1480,7 +1480,7 @@ instantiate_virtual_regs_in_rtx (rtx *loc)
       if (rtx x = *loc)
        {
          rtx new_rtx;
-         HOST_WIDE_INT offset;
+         poly_int64 offset;
          switch (GET_CODE (x))
            {
            case REG:
@@ -1533,7 +1533,7 @@ safe_insn_predicate (int code, int operand, rtx x)
 static void
 instantiate_virtual_regs_in_insn (rtx_insn *insn)
 {
-  HOST_WIDE_INT offset;
+  poly_int64 offset;
   int insn_code, i;
   bool any_change = false;
   rtx set, new_rtx, x;
@@ -1572,7 +1572,8 @@ instantiate_virtual_regs_in_insn (rtx_insn *insn)
         to the generic case is avoiding a new pseudo and eliminating a
         move insn in the initial rtl stream.  */
       new_rtx = instantiate_new_reg (SET_SRC (set), &offset);
-      if (new_rtx && offset != 0
+      if (new_rtx
+         && maybe_ne (offset, 0)
          && REG_P (SET_DEST (set))
          && REGNO (SET_DEST (set)) > LAST_VIRTUAL_REGISTER)
        {
@@ -1598,17 +1599,18 @@ instantiate_virtual_regs_in_insn (rtx_insn *insn)
 
       /* Handle a plus involving a virtual register by determining if the
         operands remain valid if they're modified in place.  */
+      poly_int64 delta;
       if (GET_CODE (SET_SRC (set)) == PLUS
          && recog_data.n_operands >= 3
          && recog_data.operand_loc[1] == &XEXP (SET_SRC (set), 0)
          && recog_data.operand_loc[2] == &XEXP (SET_SRC (set), 1)
-         && CONST_INT_P (recog_data.operand[2])
+         && poly_int_rtx_p (recog_data.operand[2], &delta)
          && (new_rtx = instantiate_new_reg (recog_data.operand[1], &offset)))
        {
-         offset += INTVAL (recog_data.operand[2]);
+         offset += delta;
 
          /* If the sum is zero, then replace with a plain move.  */
-         if (offset == 0
+         if (known_eq (offset, 0)
              && REG_P (SET_DEST (set))
              && REGNO (SET_DEST (set)) > LAST_VIRTUAL_REGISTER)
            {
@@ -1686,7 +1688,7 @@ instantiate_virtual_regs_in_insn (rtx_insn *insn)
          new_rtx = instantiate_new_reg (x, &offset);
          if (new_rtx == NULL)
            continue;
-         if (offset == 0)
+         if (known_eq (offset, 0))
            x = new_rtx;
          else
            {
@@ -1711,7 +1713,7 @@ instantiate_virtual_regs_in_insn (rtx_insn *insn)
          new_rtx = instantiate_new_reg (SUBREG_REG (x), &offset);
          if (new_rtx == NULL)
            continue;
-         if (offset != 0)
+         if (maybe_ne (offset, 0))
            {
              start_sequence ();
              new_rtx = expand_simple_binop