From: Alan Modra <amodra@gmail.com>
Date: Wed, 1 Apr 2020 03:04:47 +0000 (+1030)
Subject: [RS6000] Count rldimi constant insns
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0075cea0fdccc2efb781f4f3c924007de37a3417;p=gcc.git

[RS6000] Count rldimi constant insns

rldimi is generated by rs6000_emit_set_long_const when the high and
low 32 bits of a 64-bit constant are equal.

	PR target/93012
	* config/rs6000/rs6000.c (num_insns_constant_gpr): Count rldimi
	constants correctly.
---

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 6f204ca202a..5f4e2927a21 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -5731,7 +5731,7 @@ direct_return (void)
 
 /* Helper for num_insns_constant.  Calculate number of instructions to
    load VALUE to a single gpr using combinations of addi, addis, ori,
-   oris and sldi instructions.  */
+   oris, sldi and rldimi instructions.  */
 
 static int
 num_insns_constant_gpr (HOST_WIDE_INT value)
@@ -5759,7 +5759,7 @@ num_insns_constant_gpr (HOST_WIDE_INT value)
 
       high >>= 1;
 
-      if (low == 0)
+      if (low == 0 || low == high)
 	return num_insns_constant_gpr (high) + 1;
       else if (high == 0)
 	return num_insns_constant_gpr (low) + 1;