[45/67] Make extract_left_shift take a scalar_int_mode

[Richard Sandiford]

This patch passes the mode of the shifted value to extract_left_shift
and updates the only caller so that the mode is a scalar_int_mode.

gcc/
2016-11-24  Richard Sandiford  <richard.sandif...@arm.com>
            Alan Hayward  <alan.hayw...@arm.com>
            David Sherwood  <david.sherw...@arm.com>

        * combine.c (extract_left_shift): Add a mode argument and update
        recursive calls.
        (make_compound_operation_int): Change the type of the mode parameter
        to scalar_int_mode and update the call to extract_left_shift.

diff --git a/gcc/combine.c b/gcc/combine.c
index 5262bf9..fac82d4 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -442,7 +442,6 @@ static rtx expand_compound_operation (rtx);
 static const_rtx expand_field_assignment (const_rtx);
 static rtx make_extraction (machine_mode, rtx, HOST_WIDE_INT,
                            rtx, unsigned HOST_WIDE_INT, int, int, int);
-static rtx extract_left_shift (rtx, int);
 static int get_pos_from_mask (unsigned HOST_WIDE_INT,
                              unsigned HOST_WIDE_INT *);
 static rtx canon_reg_for_combine (rtx, rtx);
@@ -7778,14 +7777,14 @@ make_extraction (machine_mode mode, rtx inner, 
HOST_WIDE_INT pos,
   return new_rtx;
 }
 
-/* See if X contains an ASHIFT of COUNT or more bits that can be commuted
-   with any other operations in X.  Return X without that shift if so.  */
+/* See if X (of mode MODE) contains an ASHIFT of COUNT or more bits that
+   can be commuted with any other operations in X.  Return X without
+   that shift if so.  */
 
 static rtx
-extract_left_shift (rtx x, int count)
+extract_left_shift (scalar_int_mode mode, rtx x, int count)
 {
   enum rtx_code code = GET_CODE (x);
-  machine_mode mode = GET_MODE (x);
   rtx tem;
 
   switch (code)
@@ -7801,7 +7800,7 @@ extract_left_shift (rtx x, int count)
       break;
 
     case NEG:  case NOT:
-      if ((tem = extract_left_shift (XEXP (x, 0), count)) != 0)
+      if ((tem = extract_left_shift (mode, XEXP (x, 0), count)) != 0)
        return simplify_gen_unary (code, mode, tem, mode);
 
       break;
@@ -7812,7 +7811,7 @@ extract_left_shift (rtx x, int count)
       if (CONST_INT_P (XEXP (x, 1))
          && (UINTVAL (XEXP (x, 1))
              & (((HOST_WIDE_INT_1U << count)) - 1)) == 0
-         && (tem = extract_left_shift (XEXP (x, 0), count)) != 0)
+         && (tem = extract_left_shift (mode, XEXP (x, 0), count)) != 0)
        {
          HOST_WIDE_INT val = INTVAL (XEXP (x, 1)) >> count;
          return simplify_gen_binary (code, mode, tem,
@@ -7840,7 +7839,7 @@ extract_left_shift (rtx x, int count)
    - Return a new rtx, which the caller returns directly.  */
 
 static rtx
-make_compound_operation_int (machine_mode mode, rtx *x_ptr,
+make_compound_operation_int (scalar_int_mode mode, rtx *x_ptr,
                             enum rtx_code in_code,
                             enum rtx_code *next_code_ptr)
 {
@@ -8147,7 +8146,7 @@ make_compound_operation_int (machine_mode mode, rtx 
*x_ptr,
          && INTVAL (rhs) >= 0
          && INTVAL (rhs) < HOST_BITS_PER_WIDE_INT
          && INTVAL (rhs) < mode_width
-         && (new_rtx = extract_left_shift (lhs, INTVAL (rhs))) != 0)
+         && (new_rtx = extract_left_shift (mode, lhs, INTVAL (rhs))) != 0)
        new_rtx = make_extraction (mode, make_compound_operation (new_rtx, 
next_code),
                               0, NULL_RTX, mode_width - INTVAL (rhs),
                               code == LSHIFTRT, 0, in_code == COMPARE);