From a71eee391420c2e7c284e217190290520d3e1ec3 Mon Sep 17 00:00:00 2001
From: George Koehler <xkernigh@netscape.net>
Date: Wed, 28 Sep 2016 00:13:35 -0400
Subject: [PATCH] For "pat ass", move fake stack to real stack before adjusting
 SP.

This fixes code that tried to "addi SP, SP, 4" to drop a value that
was in a register, not on the real stack.

Add a rule to optimize "asp 4" (which becomes "loc 4" "ass") when
the value being dropped is already in a GPR.
---
 mach/powerpc/ncg/table | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/mach/powerpc/ncg/table b/mach/powerpc/ncg/table
index 547fe070b..a5585bed7 100644
--- a/mach/powerpc/ncg/table
+++ b/mach/powerpc/ncg/table
@@ -2004,12 +2004,19 @@ PATTERNS
 	pat str $1==2                      /* Store HP */
 		leaving
 			ste ".reghp"
-				
+
+	pat loc ass $1==4                  /* Drop 4 bytes from stack */
+		with exact GPR
+			/* nop */
+		with STACK
+			gen
+				addi SP, SP, {CONST, 4}
+
 	pat ass                            /* Adjust stack by variable amount */
-		with CONST
+		with CONST STACK
 			gen
 				move {SUM_RC, SP, %1.val}, {GPRE, SP}
-		with GPR
+		with GPR STACK
 			gen
 				move {SUM_RR, SP, %1}, {GPRE, SP}