From a3d7df6fee322f2276ddc841c2d2e291be79680c Mon Sep 17 00:00:00 2001
From: Preston Gurd <preston.gurd@intel.com>
Date: Wed, 3 Oct 2012 16:37:56 +0000
Subject: [PATCH] Adds a test to verify that Clang does the optimization to use
 a fast div/rem instruction (for Intel Atom).

Test case for llvm commit 165126.

Patch by Tyler Nowicki.

llvm-svn: 165129
---
 clang/test/CodeGen/atom-idiv-bypass.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 clang/test/CodeGen/atom-idiv-bypass.c

diff --git a/clang/test/CodeGen/atom-idiv-bypass.c b/clang/test/CodeGen/atom-idiv-bypass.c
new file mode 100644
index 0000000..596e18b
--- /dev/null
+++ b/clang/test/CodeGen/atom-idiv-bypass.c
@@ -0,0 +1,32 @@
+// This test verifies that IDIV bypass optimizations is used when compiling for
+// Atom processors with O2. The optimization inserts a test followed by a
+// branch to bypass the slow IDIV instruction. This test verifies that global
+// context types are used when comparing with those in the BypassTypeMap.
+
+// RUN: %clang_cc1 %s -march=atom -m32 -O2 -S -o - | FileCheck %s
+// CHECK: div32
+// CHECK: orl
+// CHECK: testl
+// CHECK: je
+// CHECK: idivl
+// CHECK: ret
+// CHECK: divb
+// CHECK: ret
+int div32(int a, int b)
+{
+  return a/b;
+}
+
+// CHECK: divrem32
+// CHECK: orl
+// CHECK: testl
+// CHECK: je
+// CHECK: idivl
+// CHECK: jmp
+// CHECK: divb
+// CHECK: addl
+// CHECK: ret
+int divrem32(int a, int b)
+{
+  return a/b + a%b;
+}
-- 
2.7.4