From: Georg-Johann Lay <avr@gjlay.de>
Date: Wed, 6 Mar 2024 11:46:25 +0000 (+0100)
Subject: AVR: Adjust rtx cost of plus + zero_extend.
X-Git-Tag: basepoints/gcc-15~803
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b7d14310406a13aaf518c6c34728433077cd545a;p=thirdparty%2Fgcc.git

AVR: Adjust rtx cost of plus + zero_extend.

gcc/
	* config/avr/avr.cc (avr_rtx_costs_1) [PLUS+ZERO_EXTEND]: Adjust
	rtx cost.
---

diff --git a/gcc/config/avr/avr.cc b/gcc/config/avr/avr.cc
index 36995e05cbec..b87ae6a256de 100644
--- a/gcc/config/avr/avr.cc
+++ b/gcc/config/avr/avr.cc
@@ -12513,6 +12513,13 @@ avr_rtx_costs_1 (rtx x, machine_mode mode, int outer_code,
       return true;
 
     case PLUS:
+      if (GET_CODE (XEXP (x, 0)) == ZERO_EXTEND
+	  && REG_P (XEXP (x, 1)))
+	{
+	  *total = COSTS_N_INSNS (GET_MODE_SIZE (mode) - 1);
+	  return true;
+	}
+
       switch (mode)
 	{
 	case E_QImode: