From 509a492442b7e889d615d3b451629c81a810aef1 Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault@amd.com>
Date: Fri, 15 Nov 2013 04:42:23 +0000
Subject: Add target hook to prevent folding some bitcasted loads.

This is to avoid this transformation in some cases:
fold (conv (load x)) -> (load (conv*)x)

On architectures that don't natively support some vector
loads efficiently casting the load to a smaller vector of
larger types and loading is more efficient.

Patch by Micah Villmow.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194783 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/R600/combine_vloads.ll | 42 +++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 test/CodeGen/R600/combine_vloads.ll

(limited to 'test')

diff --git a/test/CodeGen/R600/combine_vloads.ll b/test/CodeGen/R600/combine_vloads.ll
new file mode 100644
index 0000000..f8ec712
--- /dev/null
+++ b/test/CodeGen/R600/combine_vloads.ll
@@ -0,0 +1,42 @@
+; RUN: llc -march=r600 -mcpu=cypress < %s | FileCheck -check-prefix=EG %s
+
+;
+; kernel void combine_vloads(global char8* src, global char8* result) {
+;   for (int i = 0; i < 1024; ++i)
+;     result[i] = src[0] + src[1] + src[2] + src[3];
+; }
+;
+
+
+; 128-bit loads instead of many 8-bit
+; EG-LABEL: @combine_vloads:
+; EG: VTX_READ_128
+; EG: VTX_READ_128
+define void @combine_vloads(<8 x i8> addrspace(1)* nocapture %src, <8 x i8> addrspace(1)* nocapture %result) nounwind {
+entry:
+  br label %for.body
+
+for.exit:                                         ; preds = %for.body
+  ret void
+
+for.body:                                         ; preds = %for.body, %entry
+  %i.01 = phi i32 [ 0, %entry ], [ %tmp19, %for.body ]
+  %arrayidx_v4 = bitcast <8 x i8> addrspace(1)* %src to <32 x i8> addrspace(1)*
+  %0 = bitcast <32 x i8> addrspace(1)* %arrayidx_v4 to <8 x i32> addrspace(1)*
+  %vecload2 = load <8 x i32> addrspace(1)* %0, align 32
+  %1 = bitcast <8 x i32> %vecload2 to <32 x i8>
+  %tmp5 = shufflevector <32 x i8> %1, <32 x i8> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
+  %tmp8 = shufflevector <32 x i8> %1, <32 x i8> undef, <8 x i32> <i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15>
+  %tmp9 = add nsw <8 x i8> %tmp5, %tmp8
+  %tmp12 = shufflevector <32 x i8> %1, <32 x i8> undef, <8 x i32> <i32 16, i32 17, i32 18, i32 19, i32 20, i32 21, i32 22, i32 23>
+  %tmp13 = add nsw <8 x i8> %tmp9, %tmp12
+  %tmp16 = shufflevector <32 x i8> %1, <32 x i8> undef, <8 x i32> <i32 24, i32 25, i32 26, i32 27, i32 28, i32 29, i32 30, i32 31>
+  %tmp17 = add nsw <8 x i8> %tmp13, %tmp16
+  %scevgep = getelementptr <8 x i8> addrspace(1)* %result, i32 %i.01
+  %2 = bitcast <8 x i8> %tmp17 to <2 x i32>
+  %3 = bitcast <8 x i8> addrspace(1)* %scevgep to <2 x i32> addrspace(1)*
+  store <2 x i32> %2, <2 x i32> addrspace(1)* %3, align 8
+  %tmp19 = add nsw i32 %i.01, 1
+  %exitcond = icmp eq i32 %tmp19, 1024
+  br i1 %exitcond, label %for.exit, label %for.body
+}
-- 
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