From: Roger Sayle <roger@nextmovesoftware.com>
Date: Wed, 2 Sep 2020 08:30:50 +0000 (+0100)
Subject: hppa: Improve hppa_rtx_costs for shifts by constants.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6640a5b9e7c6f66a7d0c3de1bf01f24c3b20b692;p=gcc.git

hppa: Improve hppa_rtx_costs for shifts by constants.

This patch provides more accurate rtx_costs estimates for shifts by
integer constants (which are cheaper than by a register amount).

2020-09-02  Roger Sayle  <roger@nextmovesoftware.com>

gcc/ChangeLog
	* config/pa/pa.c (hppa_rtx_costs) [ASHIFT, ASHIFTRT, LSHIFTRT]:
	Provide accurate costs for shifts of integer constants.
---

diff --git a/gcc/config/pa/pa.c b/gcc/config/pa/pa.c
index cb888528765..a9223ab3fe9 100644
--- a/gcc/config/pa/pa.c
+++ b/gcc/config/pa/pa.c
@@ -1642,6 +1642,14 @@ hppa_rtx_costs (rtx x, machine_mode mode, int outer_code,
 	  else
 	    *total = COSTS_N_INSNS (18);
 	}
+      else if (REG_P (XEXP (x, 0)) && CONST_INT_P (XEXP (x, 1)))
+	{
+	  if (TARGET_64BIT)
+	    *total = COSTS_N_INSNS (2);
+	  else
+	    *total = COSTS_N_INSNS (1);
+	  return true;
+	}
       else if (TARGET_64BIT)
 	*total = COSTS_N_INSNS (4);
       else
@@ -1665,6 +1673,14 @@ hppa_rtx_costs (rtx x, machine_mode mode, int outer_code,
 	  else
 	    *total = COSTS_N_INSNS (19);
 	}
+      else if (REG_P (XEXP (x, 0)) && CONST_INT_P (XEXP (x, 1)))
+	{
+	  if (TARGET_64BIT)
+	    *total = COSTS_N_INSNS (2);
+	  else
+	    *total = COSTS_N_INSNS (1);
+	  return true;
+	}
       else if (TARGET_64BIT)
 	*total = COSTS_N_INSNS (4);
       else
@@ -1688,6 +1704,11 @@ hppa_rtx_costs (rtx x, machine_mode mode, int outer_code,
 	  else
 	    *total = COSTS_N_INSNS (15);
 	}
+      else if (REG_P (XEXP (x, 0)) && CONST_INT_P (XEXP (x, 1)))
+	{
+	  *total = COSTS_N_INSNS (1);
+	  return true;
+	}
       else if (TARGET_64BIT)
 	*total = COSTS_N_INSNS (3);
       else