Imported Upstream version 5.18.0.225

Former-commit-id: 10196d987d5fc5564b9d3b33b1fdf13190f4d0b5

external/llvm/test/CodeGen/AVR/branch-relaxation.ll

@@ -0,0 +1,96 @@
+; RUN: llc < %s -march=avr | FileCheck %s
+
+; CHECK-LABEL: relax_breq
+; CHECK: cpi     r{{[0-9]+}}, 0
+; CHECK: brne    LBB0_1
+; CHECK: rjmp    LBB0_2
+; LBB0_1:
+
+define i8 @relax_breq(i1 %a) {
+entry-block:
+  br i1 %a, label %hello, label %finished
+
+hello:
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  br label %finished
+finished:
+  ret i8 3
+}
+
+; CHECK-LABEL: no_relax_breq
+; CHECK: cpi     r{{[0-9]+}}, 0
+; CHECK: breq    [[END_BB:LBB[0-9]+_[0-9]+]]
+; CHECK: nop
+; ...
+; LBB0_1:
+define i8 @no_relax_breq(i1 %a) {
+entry-block:
+  br i1 %a, label %hello, label %finished
+
+hello:
+  ; There are not enough NOPs to require relaxation.
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  call void asm sideeffect "nop", ""()
+  br label %finished
+finished:
+  ret i8 3
+}
+