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

diff --git a/clang/test/CodeGen/atom-idiv-bypass.c b/clang/test/CodeGen/atom-idiv-bypass.c
new file mode 100644 (file)
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;
+}