From 4c6428f58e52e60bdb05e1c4f63c6cc26ffd2f19 Mon Sep 17 00:00:00 2001
From: Coby Tayree <coby.tayree@intel.com>
Date: Mon, 24 Jul 2017 07:06:37 +0000
Subject: [PATCH] [X86][InlineAsm][Ms Compatibility]Prefer variable name over a
 register when the two collides

On MS-style, the following snippet:

int eax;
__asm mov eax, ebx

should yield loading of ebx, into the location pointed by the variable eax

This patch sees to it.

Currently, a reg-to-reg move would have been invoked.

llvm: D34739

Differential Revision: https://reviews.llvm.org/D34740


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@308867 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/ms-inline-asm-var-name.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 test/CodeGen/ms-inline-asm-var-name.c

diff --git a/test/CodeGen/ms-inline-asm-var-name.c b/test/CodeGen/ms-inline-asm-var-name.c
new file mode 100644
index 0000000000..084e90500a
--- /dev/null
+++ b/test/CodeGen/ms-inline-asm-var-name.c
@@ -0,0 +1,12 @@
+// REQUIRES: x86-registered-target
+// RUN: %clang_cc1 %s -triple i386-apple-darwin10 -fasm-blocks -emit-llvm -o - | FileCheck %s
+
+void t() {
+  int eax;
+  int Ecx;
+  __asm mov eax, ebx
+  // CHECK: mov $0, ebx
+  __asm add ecx, Ecx
+  // CHECK: add ecx, $1
+}
+
-- 
2.40.0