Vendor import of llvm trunk r161861:

http://llvm.org/svn/llvm-project/llvm/trunk@161861

1 files changed, 63 insertions, 0 deletions

diff --git a/test/CodeGen/X86/cmov-into-branch.ll b/test/CodeGen/X86/cmov-into-branch.ll
new file mode 100644
index 0000000..780746a
--- /dev/null
+++ b/test/CodeGen/X86/cmov-into-branch.ll
@@ -0,0 +1,63 @@
+; RUN: llc -march=x86-64 -mcpu=core2 < %s | FileCheck %s
+
+; cmp with single-use load, should not form cmov.
+define i32 @test1(double %a, double* nocapture %b, i32 %x, i32 %y)  {
+  %load = load double* %b, align 8
+  %cmp = fcmp olt double %load, %a
+  %cond = select i1 %cmp, i32 %x, i32 %y
+  ret i32 %cond
+; CHECK: test1:
+; CHECK: ucomisd
+; CHECK-NOT: cmov
+; CHECK: j
+; CHECK-NOT: cmov
+}
+
+; Sanity check: no load.
+define i32 @test2(double %a, double %b, i32 %x, i32 %y)  {
+  %cmp = fcmp ogt double %a, %b
+  %cond = select i1 %cmp, i32 %x, i32 %y
+  ret i32 %cond
+; CHECK: test2:
+; CHECK: ucomisd
+; CHECK: cmov
+}
+
+; Multiple uses of %a, should not form cmov.
+define i32 @test3(i32 %a, i32* nocapture %b, i32 %x)  {
+  %load = load i32* %b, align 4
+  %cmp = icmp ult i32 %load, %a
+  %cond = select i1 %cmp, i32 %a, i32 %x
+  ret i32 %cond
+; CHECK: test3:
+; CHECK: cmpl
+; CHECK-NOT: cmov
+; CHECK: j
+; CHECK-NOT: cmov
+}
+
+; Multiple uses of the load.
+define i32 @test4(i32 %a, i32* nocapture %b, i32 %x, i32 %y)  {
+  %load = load i32* %b, align 4
+  %cmp = icmp ult i32 %load, %a
+  %cond = select i1 %cmp, i32 %x, i32 %y
+  %add = add i32 %cond, %load
+  ret i32 %add
+; CHECK: test4:
+; CHECK: cmpl
+; CHECK: cmov
+}
+
+; Multiple uses of the cmp.
+define i32 @test5(i32 %a, i32* nocapture %b, i32 %x, i32 %y) {
+  %load = load i32* %b, align 4
+  %cmp = icmp ult i32 %load, %a
+  %cmp1 = icmp ugt i32 %load, %a
+  %cond = select i1 %cmp1, i32 %a, i32 %y
+  %cond5 = select i1 %cmp, i32 %cond, i32 %x
+  ret i32 %cond5
+; CHECK: test5:
+; CHECK: cmpl
+; CHECK: cmov
+; CHECK: cmov
+}