From: Wolfgang (Blub) Bumiller <blub@speed.at>
Date: Wed, 5 Dec 2012 14:17:11 +0000 (+0100)
Subject: Tiny codegen optimization: silently ignore the creation of STORE with input and outpu... 
X-Git-Tag: 0.1.9~109
X-Git-Url: https://git.rm.cloudns.org/?a=commitdiff_plain;h=37fbe7176f311382c058ae9cd65bfad9bcb70302;p=xonotic%2Fgmqcc.git

Tiny codegen optimization: silently ignore the creation of STORE with input and output being the same address
---

diff --git a/ir.c b/ir.c
index 890ea0f..ed58ea9 100644
--- a/ir.c
+++ b/ir.c
@@ -2832,6 +2832,16 @@ tailcall:
             /* 2-operand instructions with A -> B */
             stmt.o2.u1 = stmt.o3.u1;
             stmt.o3.u1 = 0;
+
+            /* tiny optimization, don't output
+             * STORE a, a
+             */
+            if (stmt.o2.u1 == stmt.o1.u1 &&
+                OPTS_OPTIMIZATION(OPTIM_MINOR))
+            {
+                ++optimization_count[OPTIM_MINOR];
+                continue;
+            }
         }
 
         code_push_statement(&stmt, instr->context.line);