From 74bf7a8467262ad60c8b13582bd6b07fd30b5550 Mon Sep 17 00:00:00 2001
From: Michel Danzer <michel.daenzer@amd.com>
Date: Thu, 21 Feb 2013 08:57:10 +0000
Subject: [PATCH] R600/SI: Make sure M0 is loaded for V_INTERP_MOV_F32

NOTE: This is a candidate for the Mesa stable branch.

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175733 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/R600/SIInstructions.td             |  3 ++-
 .../R600/llvm.SI.fs.interp.constant.ll        | 23 +++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 test/CodeGen/R600/llvm.SI.fs.interp.constant.ll

diff --git a/lib/Target/R600/SIInstructions.td b/lib/Target/R600/SIInstructions.td
index b4a263d02c7..aef239c7e59 100644
--- a/lib/Target/R600/SIInstructions.td
+++ b/lib/Target/R600/SIInstructions.td
@@ -1311,7 +1311,8 @@ def : Pat <
 
 def : Pat <
   (int_SI_fs_interp_constant imm:$attr_chan, imm:$attr, SReg_32:$params),
-  (V_INTERP_MOV_F32 INTERP.P0, imm:$attr_chan, imm:$attr, SReg_32:$params)
+  (V_INTERP_MOV_F32 INTERP.P0, imm:$attr_chan, imm:$attr,
+                    (S_MOV_B32 SReg_32:$params))
 >;
 
 def : Pat <
diff --git a/test/CodeGen/R600/llvm.SI.fs.interp.constant.ll b/test/CodeGen/R600/llvm.SI.fs.interp.constant.ll
new file mode 100644
index 00000000000..0c19f14cc45
--- /dev/null
+++ b/test/CodeGen/R600/llvm.SI.fs.interp.constant.ll
@@ -0,0 +1,23 @@
+;RUN: llc < %s -march=r600 -mcpu=SI | FileCheck %s
+
+;CHECK: S_MOV_B32
+;CHECK-NEXT: V_INTERP_MOV_F32
+
+define void @main() {
+main_body:
+  call void @llvm.AMDGPU.shader.type(i32 0)
+  %0 = load i32 addrspace(8)* inttoptr (i32 6 to i32 addrspace(8)*)
+  %1 = call float @llvm.SI.fs.interp.constant(i32 0, i32 0, i32 %0)
+  %2 = call i32 @llvm.SI.packf16(float %1, float %1)
+  %3 = bitcast i32 %2 to float
+  call void @llvm.SI.export(i32 15, i32 1, i32 1, i32 0, i32 1, float %3, float %3, float %3, float %3)
+  ret void
+}
+
+declare void @llvm.AMDGPU.shader.type(i32)
+
+declare float @llvm.SI.fs.interp.constant(i32, i32, i32) readonly
+
+declare i32 @llvm.SI.packf16(float, float) readnone
+
+declare void @llvm.SI.export(i32, i32, i32, i32, i32, float, float, float, float)
-- 
2.34.1