Enable SHIFT_COUNT_TRUNCATED for ARC

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
foss-for-synopsys-dwc-arc-processors · Jul 6, 2015 · 3991768 · 3991768
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diff --git a/gcc/ChangeLog.ARC b/gcc/ChangeLog.ARC
@@ -2,6 +2,13 @@
 
 	* config/arc/arc.md (doloop_begin_i): Append "@" for symbols.
 
+2015-07-06  Vineet Gupta  <vgupta@synopsys.com>
+
+	* config/arc/arc.h (SHIFT_COUNT_TRUNCATED): Define as 1.
+	Verfied that gcc/testsuite/gcc.c-torture/execute/20020226-1.c
+	works the same before and after (as that was alilely issue when
+	this was tried in the past)
+
 2015-06-26  Claudiu Zissulescu  <claziss@synopsys.com>
 
 	* config/arc/arc.opt (mshift-assist): Remove.

diff --git a/gcc/config/arc/arc.h b/gcc/config/arc/arc.h
@@ -1611,8 +1611,10 @@ extern int arc_return_address_regs[4];
    (e.g. 20020226-1.c). This change truncates the upper 27 bits of a word
    while rotating a word. Came to notice through a combine phase
    optimization viz. a << (32-b) is equivalent to a << (-b).
+   vgupta: Changed this back to 1 in 4.8.4 and see that above test passes
+   nevertheless both at -O2 and otherwise
 */
-#define SHIFT_COUNT_TRUNCATED 0
+#define SHIFT_COUNT_TRUNCATED 1
 
 /* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
    is done just by pretending it is already truncated.  */