From 36d89bfaa834151adbc56315c771e1ba7fa12c7f Mon Sep 17 00:00:00 2001
From: Tom Stellard <thomas.stellard@amd.com>
Date: Tue, 31 Mar 2015 17:52:24 +0000
Subject: [PATCH] R600/SI: Add VCC as an implict def of SI_KILL

When SI_KILL has a register operand, its lowered form writes to vcc.
---
 lib/Target/R600/SIInstructions.td     |  9 ++++++---
 test/CodeGen/R600/llvm.AMDGPU.kill.ll | 16 ++++++++++++++++
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/lib/Target/R600/SIInstructions.td b/lib/Target/R600/SIInstructions.td
index 95b2470..d1db4ab 100644
--- a/lib/Target/R600/SIInstructions.td
+++ b/lib/Target/R600/SIInstructions.td
@@ -1895,8 +1895,8 @@ def SGPR_USE : InstSI <(outs),(ins), "", []>;
 // SI pseudo instructions. These are used by the CFG structurizer pass
 // and should be lowered to ISA instructions prior to codegen.
 
-let mayLoad = 1, mayStore = 1, hasSideEffects = 1,
-    Uses = [EXEC], Defs = [EXEC] in {
+let mayLoad = 1, mayStore = 1, hasSideEffects = 1 in {
+let Uses = [EXEC], Defs = [EXEC] in {
 
 let isBranch = 1, isTerminator = 1 in {
 
@@ -1953,15 +1953,18 @@ def SI_END_CF : InstSI <
   [(int_SI_end_cf i64:$saved)]
 >;
 
+} // End Uses = [EXEC], Defs = [EXEC]
+
+let Uses = [EXEC], Defs = [EXEC,VCC] in {
 def SI_KILL : InstSI <
   (outs),
   (ins VSrc_32:$src),
   "si_kill $src",
   [(int_AMDGPU_kill f32:$src)]
 >;
+} // End Uses = [EXEC], Defs = [EXEC,VCC]
 
 } // end mayLoad = 1, mayStore = 1, hasSideEffects = 1
-  // Uses = [EXEC], Defs = [EXEC]
 
 let Uses = [EXEC], Defs = [EXEC,VCC,M0] in {
 
diff --git a/test/CodeGen/R600/llvm.AMDGPU.kill.ll b/test/CodeGen/R600/llvm.AMDGPU.kill.ll
index d1ff3b1..057708e 100644
--- a/test/CodeGen/R600/llvm.AMDGPU.kill.ll
+++ b/test/CodeGen/R600/llvm.AMDGPU.kill.ll
@@ -16,8 +16,24 @@ main_body:
   ret void
 }
 
+; SI-LABEL: {{^}}kill_vcc_implicit_def:
+; SI-NOT: v_cmp_gt_f32_e32 vcc,
+; SI: v_cmp_gt_f32_e64 [[CMP:s\[[0-9]+:[0-9]+\]]], 0, v{{[0-9]+}}
+; SI: v_cmpx_le_f32_e32 vcc, 0, v{{[0-9]+}}
+; SI: v_cndmask_b32_e64 v{{[0-9]+}}, 0, 1.0, [[CMP]]
+define void @kill_vcc_implicit_def([6 x <16 x i8>] addrspace(2)* byval, [17 x <16 x i8>] addrspace(2)* byval, [17 x <4 x i32>] addrspace(2)* byval, [34 x <8 x i32>] addrspace(2)* byval, float inreg, i32 inreg, <2 x i32>, <2 x i32>, <2 x i32>, <3 x i32>, <2 x i32>, <2 x i32>, <2 x i32>, float, float, float, float, float, float, i32, float, float) #1 {
+entry:
+  %tmp0 = fcmp olt float %13, 0.0
+  call void @llvm.AMDGPU.kill(float %14)
+  %tmp1 = select i1 %tmp0, float 1.0, float 0.0
+  call void @llvm.SI.export(i32 15, i32 1, i32 1, i32 1, i32 1, float %tmp1, float %tmp1, float %tmp1, float %tmp1)
+  ret void
+}
+
 declare void @llvm.AMDGPU.kill(float)
+declare void @llvm.SI.export(i32, i32, i32, i32, i32, float, float, float, float)
 
 attributes #0 = { "ShaderType"="2" }
+attributes #1 = { "ShaderType"="0" }
 
 !0 = !{!"const", null, i32 1}
-- 
2.0.4