re PR target/87079 (nios2 optimization for size - case of regression relatively to 5.3.0)

2018-11-03  Sandra Loosemore  <sandra@codesourcery.com>

	PR target/87079

	gcc/
	* config/nios2/nios2.c (nios2_rtx_costs): Recognize <mul>sidi3
	pattern.

	gcc/testsuite/
	* gcc.target/nios2/pr87079-1.c: New.	
	* gcc.target/nios2/pr87079-2.c: New.

From-SVN: r265770

gcc/ChangeLog

+2018-11-03  Sandra Loosemore  <sandra@codesourcery.com>
+
+	PR target/87079
+
+	* config/nios2/nios2.c (nios2_rtx_costs): Recognize <mul>sidi3
+	pattern.
+
 2018-11-02  Aaron Sawdey  <acsawdey@linux.ibm.com>
 
 	* config/rs6000/rs6000-string.c (expand_strncmp_gpr_sequence): Pay

gcc/config/nios2/nios2.c

@@ -1539,6 +1539,19 @@ nios2_rtx_costs (rtx x, machine_mode mode,
 	    *total = COSTS_N_INSNS (2);  /* Latency adjustment.  */
 	  else 
 	    *total = COSTS_N_INSNS (1);
+	  if (TARGET_HAS_MULX && GET_MODE (x) == DImode)
+	    {
+	      enum rtx_code c0 = GET_CODE (XEXP (x, 0));
+	      enum rtx_code c1 = GET_CODE (XEXP (x, 1));
+	      if ((c0 == SIGN_EXTEND && c1 == SIGN_EXTEND)
+		  || (c0 == ZERO_EXTEND && c1 == ZERO_EXTEND))
+		/* This is the <mul>sidi3 pattern, which expands into 4 insns,
+		   2 multiplies and 2 moves.  */
+		{
+		  *total = *total * 2 + COSTS_N_INSNS (2);
+		  return true;
+		}
+	    }
           return false;
         }
 

gcc/testsuite/ChangeLog

+2018-11-03  Sandra Loosemore  <sandra@codesourcery.com>
+
+	PR target/87079
+
+	* gcc.target/nios2/pr87079-1.c: New.	
+	* gcc.target/nios2/pr87079-2.c: New.	
+
 2018-11-02  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* gcc.dg/compat/pr83487-1_y.c: Move dg-skip-if ...

gcc/testsuite/gcc.target/nios2/pr87079-1.c

+/* { dg-do compile } */
+/* { dg-options "-Os -mhw-div -mhw-mul -mhw-mulx" } */
+
+#include <stdint.h>
+#include <stddef.h>
+
+void foo(const uint8_t* str, uint32_t* res)
+{
+  uint32_t rdVal0, rdVal1, rdVal2;
+  rdVal0 = rdVal1 = rdVal2 = 0;
+  unsigned c;
+  for (;;) {
+    c = *str++;
+    unsigned dig = c - '0';
+    if (dig > 9)
+      break; // non-digit
+    uint64_t x10;
+
+    x10 = (uint64_t)rdVal0*10 + dig;
+    rdVal0 = (uint32_t)x10;
+    dig = (uint32_t)(x10 >> 32);
+
+    x10 = (uint64_t)rdVal1*10 + dig;
+    rdVal1 = (uint32_t)x10;
+    dig = (uint32_t)(x10 >> 32);
+
+    rdVal2 = rdVal2*10 + dig;
+  }
+  res[0] = rdVal0;
+  res[1] = rdVal1;
+  res[2] = rdVal2;
+}
+
+/* { dg-final { scan-assembler-times "mulxuu\t" 2 } } */

gcc/testsuite/gcc.target/nios2/pr87079-2.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -mhw-div -mhw-mul -mhw-mulx" } */
+
+#include <stdint.h>
+#include <stddef.h>
+
+void foo(const uint8_t* str, uint32_t* res)
+{
+  uint32_t rdVal0, rdVal1, rdVal2;
+  rdVal0 = rdVal1 = rdVal2 = 0;
+  unsigned c;
+  for (;;) {
+    c = *str++;
+    unsigned dig = c - '0';
+    if (dig > 9)
+      break; // non-digit
+    uint64_t x10;
+
+    x10 = (uint64_t)rdVal0*10 + dig;
+    rdVal0 = (uint32_t)x10;
+    dig = (uint32_t)(x10 >> 32);
+
+    x10 = (uint64_t)rdVal1*10 + dig;
+    rdVal1 = (uint32_t)x10;
+    dig = (uint32_t)(x10 >> 32);
+
+    rdVal2 = rdVal2*10 + dig;
+  }
+  res[0] = rdVal0;
+  res[1] = rdVal1;
+  res[2] = rdVal2;
+}
+
+/* { dg-final { scan-assembler-times "mulxuu\t" 2 } } */