From df27aa8c89ce96f7b01a0919697b0ea1505c01f3 Mon Sep 17 00:00:00 2001
From: Kyle Butt <kyle+llvm@iteratee.net>
Date: Tue, 10 Jan 2017 23:04:30 +0000
Subject: 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
---
 llvm/test/CodeGen/AMDGPU/skip-if-dead.ll | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

(limited to 'llvm/test/CodeGen/AMDGPU/skip-if-dead.ll')

diff --git a/llvm/test/CodeGen/AMDGPU/skip-if-dead.ll b/llvm/test/CodeGen/AMDGPU/skip-if-dead.ll
index 60cee7a3499..23b67534440 100644
--- a/llvm/test/CodeGen/AMDGPU/skip-if-dead.ll
+++ b/llvm/test/CodeGen/AMDGPU/skip-if-dead.ll
@@ -263,18 +263,25 @@ exit:
 ; 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
-- 
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