From: Richard Henderson <rth@cygnus.com>
Date: Mon, 15 Dec 1997 18:39:02 +0000 (-0800)
Subject: * expmed.c (expand_shift): If SHIFT_COUNT_TRUNCATED, drop a SUBREG.
X-Git-Tag: releases/libf2c-0.5.21~349
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=166cdf4ab4c19a9017c07e95a7af8b77aae3a7f0;p=thirdparty%2Fgcc.git

* expmed.c (expand_shift): If SHIFT_COUNT_TRUNCATED, drop a SUBREG.

From-SVN: r17107
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 275d6c734833..a8f99531492e 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+Mon Dec 15 18:40:08 1997  Richard Henderson  <rth@cygnus.com>
+
+	* expmed.c (expand_shift): If SHIFT_COUNT_TRUNCATED, drop a SUBREG.
+
 Mon Dec 15 18:31:43 1997  Richard Henderson  <rth@cygnus.com>
 
 	* alpha.c (alpha_cpu_name): New variable.
diff --git a/gcc/expmed.c b/gcc/expmed.c
index 8170c26b7cc6..fba7182e3057 100644
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -1752,11 +1752,16 @@ expand_shift (code, mode, shifted, amount, target, unsignedp)
   op1 = expand_expr (amount, NULL_RTX, VOIDmode, 0);
 
 #ifdef SHIFT_COUNT_TRUNCATED
-  if (SHIFT_COUNT_TRUNCATED
-      && GET_CODE (op1) == CONST_INT
-      && (unsigned HOST_WIDE_INT) INTVAL (op1) >= GET_MODE_BITSIZE (mode))
-    op1 = GEN_INT ((unsigned HOST_WIDE_INT) INTVAL (op1)
-		   % GET_MODE_BITSIZE (mode));
+  if (SHIFT_COUNT_TRUNCATED)
+    {
+      if (GET_CODE (op1) == CONST_INT
+          && (unsigned HOST_WIDE_INT) INTVAL (op1) >= GET_MODE_BITSIZE (mode))
+        op1 = GEN_INT ((unsigned HOST_WIDE_INT) INTVAL (op1)
+		       % GET_MODE_BITSIZE (mode));
+      else if (GET_CODE (op1) == SUBREG
+	       && SUBREG_WORD (op1) == 0)
+	op1 = SUBREG_REG (op1);
+    }
 #endif
 
   if (op1 == const0_rtx)