# HG changeset patch
# User rkennke
# Date 1541706550 -3600
#      Thu Nov 08 20:49:10 2018 +0100
# Node ID f8d9ced927d21b1b1b6c59350db785b02ebbf762
# Parent  dc1f9dec2018a37fedba47d8a2aedef99faaec64
8213473: Prevent transformation of LoadB->AndI->CmpI pattern to facilitate testb instruction matching

diff --git a/src/hotspot/cpu/x86/x86_64.ad b/src/hotspot/cpu/x86/x86_64.ad
--- a/src/hotspot/cpu/x86/x86_64.ad
+++ b/src/hotspot/cpu/x86/x86_64.ad
@@ -11889,9 +11889,9 @@
   ins_pipe(ialu_cr_reg_mem);
 %}
 
-instruct testB_mem_imm(rFlagsReg cr, memory mem, immI8 imm, immI0 zero)
-%{
-  match(Set cr (CmpI (AndI (LoadB mem) imm) zero));
+instruct testUB_mem_imm(rFlagsReg cr, memory mem, immU8 imm, immI0 zero)
+%{
+  match(Set cr (CmpI (AndI (LoadUB mem) imm) zero));
 
   ins_cost(125);
   format %{ "testb   $mem, $imm" %}