gcc/

	* simplify-rtx.c (simplify_subreg): Check that the inner mode is
	a scalar integer before applying integer-only optimisations to
	inner arithmetic.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@178848 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 7de4c65..941abc4 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2011-09-14  Richard Sandiford  <richard.sandiford@linaro.org>
+
+       * simplify-rtx.c (simplify_subreg): Check that the inner mode is
+       a scalar integer before applying integer-only optimisations to
+       inner arithmetic.
+
 2011-09-14  Bernd Schmidt  <bernds@codesourcery.com>
 
        * config/mips/mips.c (mips_expand_epilogue): Generate a

diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index ef5ea1a..d81e3a6 100644 (file)
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -5611,6 +5611,7 @@ simplify_subreg (enum machine_mode outermode, rtx op,
   /* Optimize SUBREG truncations of zero and sign extended values.  */
   if ((GET_CODE (op) == ZERO_EXTEND
        || GET_CODE (op) == SIGN_EXTEND)
+      && SCALAR_INT_MODE_P (innermode)
       && GET_MODE_PRECISION (outermode) < GET_MODE_PRECISION (innermode))
     {
       unsigned int bitpos = subreg_lsb_1 (outermode, innermode, byte);
@@ -5649,6 +5650,7 @@ simplify_subreg (enum machine_mode outermode, rtx op,
   if ((GET_CODE (op) == LSHIFTRT
        || GET_CODE (op) == ASHIFTRT)
       && SCALAR_INT_MODE_P (outermode)
+      && SCALAR_INT_MODE_P (innermode)
       /* Ensure that OUTERMODE is at least twice as wide as the INNERMODE
         to avoid the possibility that an outer LSHIFTRT shifts by more
         than the sign extension's sign_bit_copies and introduces zeros
@@ -5668,6 +5670,7 @@ simplify_subreg (enum machine_mode outermode, rtx op,
   if ((GET_CODE (op) == LSHIFTRT
        || GET_CODE (op) == ASHIFTRT)
       && SCALAR_INT_MODE_P (outermode)
+      && SCALAR_INT_MODE_P (innermode)
       && GET_MODE_PRECISION (outermode) < GET_MODE_PRECISION (innermode)
       && CONST_INT_P (XEXP (op, 1))
       && GET_CODE (XEXP (op, 0)) == ZERO_EXTEND
@@ -5682,6 +5685,7 @@ simplify_subreg (enum machine_mode outermode, rtx op,
      the outer subreg is effectively a truncation to the original mode.  */
   if (GET_CODE (op) == ASHIFT
       && SCALAR_INT_MODE_P (outermode)
+      && SCALAR_INT_MODE_P (innermode)
       && GET_MODE_PRECISION (outermode) < GET_MODE_PRECISION (innermode)
       && CONST_INT_P (XEXP (op, 1))
       && (GET_CODE (XEXP (op, 0)) == ZERO_EXTEND
@@ -5695,7 +5699,7 @@ simplify_subreg (enum machine_mode outermode, rtx op,
   /* Recognize a word extraction from a multi-word subreg.  */
   if ((GET_CODE (op) == LSHIFTRT
        || GET_CODE (op) == ASHIFTRT)
-      && SCALAR_INT_MODE_P (outermode)
+      && SCALAR_INT_MODE_P (innermode)
       && GET_MODE_PRECISION (outermode) >= BITS_PER_WORD
       && GET_MODE_PRECISION (innermode) >= (2 * GET_MODE_PRECISION (outermode))
       && CONST_INT_P (XEXP (op, 1))
@@ -5717,6 +5721,7 @@ simplify_subreg (enum machine_mode outermode, rtx op,
 
   if ((GET_CODE (op) == LSHIFTRT
        || GET_CODE (op) == ASHIFTRT)
+      && SCALAR_INT_MODE_P (innermode)
       && MEM_P (XEXP (op, 0))
       && CONST_INT_P (XEXP (op, 1))
       && GET_MODE_SIZE (outermode) < GET_MODE_SIZE (GET_MODE (op))