[GlobalISel][X86] G_BR instruction select test

llvm-svn: 303036

llvm/test/CodeGen/X86/GlobalISel/br.ll

@@ -0,0 +1,19 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -O0 -mtriple=x86_64-linux-gnu    -global-isel %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=X64
+
+define void @uncondbr() {
+; CHECK-LABEL: uncondbr:
+; CHECK:       # BB#1: # %entry
+; CHECK-NEXT:    jmp .LBB0_3
+; CHECK-NEXT:  .LBB0_2: # %end
+; CHECK-NEXT:    retq
+; CHECK-NEXT:  .LBB0_3: # %bb2
+; CHECK-NEXT:    jmp .LBB0_2
+entry:
+  br label %bb2
+end:
+  ret void
+bb2:
+  br label %end
+}
+

llvm/test/CodeGen/X86/GlobalISel/select-br.mir

@@ -0,0 +1,39 @@
+# RUN: llc -mtriple=x86_64-linux-gnu    -global-isel -run-pass=instruction-select %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=X64
+# RUN: llc -mtriple=i386-linux-gnu      -global-isel -run-pass=instruction-select %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=X32
+
+--- |
+  define void @uncondbr() {
+  entry:
+    br label %bb2
+
+  end:                                              ; preds = %bb2
+    ret void
+
+  bb2:                                              ; preds = %entry
+    br label %end
+  }
+
+...
+---
+name:            uncondbr
+# CHECK-LABEL: name:  uncondbr
+alignment:       4
+legalized:       true
+regBankSelected: true
+# CHECK:     JMP_1 %bb.2.bb2
+# CHECK:     JMP_1 %bb.1.end
+body:             |
+  bb.1.entry:
+    successors: %bb.3.bb2(0x80000000)
+
+    G_BR %bb.3.bb2
+
+  bb.2.end:
+    RET 0
+
+  bb.3.bb2:
+    successors: %bb.2.end(0x80000000)
+
+    G_BR %bb.2.end
+
+...