CodeGen: Allow small copyable blocks to "break" the CFG.
When choosing the best successor for a block, ordinarily we would have preferred
a block that preserves the CFG unless there is a strong probability the other
direction. For small blocks that can be duplicated we now skip that requirement
as well.
Differential revision: https://reviews.llvm.org/D27742
llvm-svn: 291609
diff --git a/llvm/test/CodeGen/AMDGPU/skip-if-dead.ll b/llvm/test/CodeGen/AMDGPU/skip-if-dead.ll
index 60cee7a..23b6753 100644
--- a/llvm/test/CodeGen/AMDGPU/skip-if-dead.ll
+++ b/llvm/test/CodeGen/AMDGPU/skip-if-dead.ll
@@ -263,18 +263,25 @@
; CHECK-NEXT: s_endpgm
; CHECK: [[KILLBB:BB[0-9]+_[0-9]+]]:
-; CHECK-NEXT: s_cbranch_scc0 [[PHIBB:BB[0-9]+_[0-9]+]]
+; CHECK-NEXT: s_cbranch_scc1 [[BB8:BB[0-9]+_[0-9]+]]
-; CHECK: [[PHIBB]]:
; CHECK: v_cmp_eq_f32_e32 vcc, 0, [[PHIREG]]
-; CHECK-NEXT: s_cbranch_vccz [[ENDBB:BB[0-9]+_[0-9]+]]
+; CHECK-NEXT: s_cbranch_vccnz [[BB10:BB[0-9]+_[0-9]+]]
+; CHECK-NEXT: s_branch [[END:BB[0-9]+_[0-9]+]]
-; CHECK: ; %bb10
+; CHECK [[BB8]]: ; %BB8
+; CHECK: v_mov_b32_e32 v{{[0-9]+}}, 8
+; CHECK: buffer_store_dword
+; CHECK: v_cmp_eq_f32_e32 vcc, 0, [[PHIREG]]
+; CHECK-NEXT: s_cbranch_vccz [[END]]
+
+; CHECK: [[BB10]]: ; %bb10
; CHECK: v_mov_b32_e32 v{{[0-9]+}}, 9
; CHECK: buffer_store_dword
-; CHECK: [[ENDBB]]:
+; CHECK: [[END:BB[0-9]+_[0-9]+]]: ; %end
; CHECK-NEXT: s_endpgm
+
define amdgpu_ps void @phi_use_def_before_kill() #0 {
bb:
%tmp = fadd float undef, 1.000000e+00