From: Segher Boessenkool <segher@kernel.crashing.org>
Date: Wed, 30 Nov 2016 08:41:26 +0000 (+0100)
Subject: simplify-rtx: Add missing line for previous commit (PR78583)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2df22b5f30b902dea76f131f78e08e530e7bf613;p=gcc.git

simplify-rtx: Add missing line for previous commit (PR78583)

The comment for the added case to simplify_truncation reads

  /* Turn (truncate:M1 (*_extract:M2 (reg:M2) (len) (pos))) into
     (*_extract:M1 (truncate:M1 (reg:M2)) (len) (pos')) if possible without
     changing len.  */

but I forgot to check the two modes M2 are actually the same.


	PR rtl-optimization/78583
	* simplify-rtx.c (simplify_truncation): Add check missing from the
	previous commit.

From-SVN: r243000
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 1febcad25e5..8f8e450f8f0 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2016-11-30  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR rtl-optimization/78583
+	* simplify-rtx.c (simplify_truncation): Add check missing from the
+	previous commit.
+
 2016-11-30  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	PR rtl-optimization/78590
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index 7778db55a24..7ed849f92bb 100644
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -752,6 +752,7 @@ simplify_truncation (machine_mode mode, rtx op,
      changing len.  */
   if ((GET_CODE (op) == ZERO_EXTRACT || GET_CODE (op) == SIGN_EXTRACT)
       && REG_P (XEXP (op, 0))
+      && GET_MODE (XEXP (op, 0)) == mode
       && CONST_INT_P (XEXP (op, 1))
       && CONST_INT_P (XEXP (op, 2)))
     {