[simplify-rtx][2/2] Use constants from pool when simplifying binops

	* simplify-rtx.c (simplify_binary_operation): If either operand was
	a constant pool reference use them if all other simplifications failed.

	* gcc.target/aarch64/fmul_fcvt_1.c: Add multiply-by-32 cases.

From-SVN: r229086

gcc/ChangeLog

 2015-10-20  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
+	* simplify-rtx.c (simplify_binary_operation): If either operand was
+	a constant pool reference use them if all other simplifications failed.
+
+2015-10-20  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
 	* config/aarch64/aarch64.md
 	(*aarch64_fcvt<su_optab><GPF:mode><GPI:mode>2_mult): New pattern.
 	* config/aarch64/aarch64-simd.md

gcc/simplify-rtx.c

@@ -2001,7 +2001,17 @@ simplify_binary_operation (enum rtx_code code, machine_mode mode,
   tem = simplify_const_binary_operation (code, mode, trueop0, trueop1);
   if (tem)
     return tem;
-  return simplify_binary_operation_1 (code, mode, op0, op1, trueop0, trueop1);
+  tem = simplify_binary_operation_1 (code, mode, op0, op1, trueop0, trueop1);
+
+  if (tem)
+    return tem;
+
+  /* If the above steps did not result in a simplification and op0 or op1
+     were constant pool references, use the referenced constants directly.  */
+  if (trueop0 != op0 || trueop1 != op1)
+    return simplify_gen_binary (code, mode, trueop0, trueop1);
+
+  return NULL_RTX;
 }
 
 /* Subroutine of simplify_binary_operation.  Simplify a binary operation

gcc/testsuite/ChangeLog

 2015-10-20  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
+	* gcc.target/aarch64/fmul_fcvt_1.c: Add multiply-by-32 cases.
+
+2015-10-20  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
 	* gcc.target/aarch64/fmul_fcvt_1.c: New test.
 	* gcc.target/aarch64/fmul_fcvt_2.c: Likewise.
 

gcc/testsuite/gcc.target/aarch64/fmul_fcvt_1.c

@@ -83,6 +83,16 @@ FUNC_DEFD (16)
 /* { dg-final { scan-assembler-times "fcvtzu\tx\[0-9\], d\[0-9\]*.*#4" 1 } } */
 /* { dg-final { scan-assembler-times "fcvtzu\tw\[0-9\], d\[0-9\]*.*#4" 1 } } */
 
+FUNC_DEFS (32)
+FUNC_DEFD (32)
+/* { dg-final { scan-assembler-times "fcvtzs\tw\[0-9\], s\[0-9\]*.*#5" 1 } } */
+/* { dg-final { scan-assembler-times "fcvtzs\tx\[0-9\], s\[0-9\]*.*#5" 1 } } */
+/* { dg-final { scan-assembler-times "fcvtzs\tx\[0-9\], d\[0-9\]*.*#5" 1 } } */
+/* { dg-final { scan-assembler-times "fcvtzs\tw\[0-9\], d\[0-9\]*.*#5" 1 } } */
+/* { dg-final { scan-assembler-times "fcvtzu\tw\[0-9\], s\[0-9\]*.*#5" 1 } } */
+/* { dg-final { scan-assembler-times "fcvtzu\tx\[0-9\], s\[0-9\]*.*#5" 1 } } */
+/* { dg-final { scan-assembler-times "fcvtzu\tx\[0-9\], d\[0-9\]*.*#5" 1 } } */
+/* { dg-final { scan-assembler-times "fcvtzu\tw\[0-9\], d\[0-9\]*.*#5" 1 } } */
 
 #define FUNC_TESTS(__a, __b)					\
 do								\
@@ -120,10 +130,12 @@ main (void)
       FUNC_TESTS (4, i);
       FUNC_TESTS (8, i);
       FUNC_TESTS (16, i);
+      FUNC_TESTS (32, i);
 
       FUNC_TESTD (4, i);
       FUNC_TESTD (8, i);
       FUNC_TESTD (16, i);
+      FUNC_TESTD (32, i);
     }
   return 0;
 }