AMDGPU: Override getCFInstrCost

The default cost was 0 with the assumption that it is predictable.

llvm-svn: 255796

1 files changed, 45 insertions, 0 deletions

diff --git a/llvm/test/Analysis/CostModel/AMDGPU/br.ll b/llvm/test/Analysis/CostModel/AMDGPU/br.ll
new file mode 100644
index 00000000000..0b964939756
--- /dev/null
+++ b/llvm/test/Analysis/CostModel/AMDGPU/br.ll
@@ -0,0 +1,45 @@
+; RUN: opt -cost-model -analyze -mtriple=amdgcn-unknown-amdhsa < %s | FileCheck %s
+
+; CHECK: 'test_br_cost'
+; CHECK: estimated cost of 10 for instruction: br i1
+; CHECK: estimated cost of 10 for instruction: br label
+; CHECK: estimated cost of 10 for instruction: ret void
+define void @test_br_cost(i32 addrspace(1)* %out, i32 addrspace(1)* %vaddr, i32 %b) #0 {
+bb0:
+  br i1 undef, label %bb1, label %bb2
+
+bb1:
+  %vec = load i32, i32 addrspace(1)* %vaddr
+  %add = add i32 %vec, %b
+  store i32 %add, i32 addrspace(1)* %out
+  br label %bb2
+
+bb2:
+  ret void
+
+}
+
+; CHECK: 'test_switch_cost'
+; CHECK: Unknown cost for instruction:   switch
+define void @test_switch_cost(i32 %a) #0 {
+entry:
+  switch i32 %a, label %default [
+    i32 0, label %case0
+    i32 1, label %case1
+  ]
+
+case0:
+  store volatile i32 undef, i32 addrspace(1)* undef
+  ret void
+
+case1:
+  store volatile i32 undef, i32 addrspace(1)* undef
+  ret void
+
+default:
+  store volatile i32 undef, i32 addrspace(1)* undef
+  ret void
+
+end:
+  ret void
+}