[PATCH] R600: Fix i64 to i32 trunc on SI

[Matt Arsenault]

I'm not particularly familiar with SI ISA, but the result looks about right (though with almost twice as many instructions as the shader compiler produces)

http://llvm-reviews.chandlerc.com/D1603

Files:
  lib/Target/R600/SIISelLowering.cpp
  test/CodeGen/R600/trunc.ll

Index: lib/Target/R600/SIISelLowering.cpp
===================================================================
--- lib/Target/R600/SIISelLowering.cpp
+++ lib/Target/R600/SIISelLowering.cpp
@@ -90,6 +90,7 @@
 
   setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
   setTruncStoreAction(MVT::f64, MVT::f32, Expand);
+  setTruncStoreAction(MVT::i64, MVT::i32, Expand);
 
   setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
 
Index: test/CodeGen/R600/trunc.ll
===================================================================
--- /dev/null
+++ test/CodeGen/R600/trunc.ll
@@ -0,0 +1,31 @@
+; RUN: llc -march=r600 -mcpu=SI < %s | FileCheck %s
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v16:16:16-v24:32:32-v32:32:32-v48:64:64-v64:64:64-v96:128:128-v128:128:128-v192:256:256-v256:256:256-v512:512:512-v1024:1024:1024-v2048:2048:2048-n32:64"
+target triple = "r600--"
+
+define void @trunc_i64_to_i32_store(i32 addrspace(1)* %out, i64 %in) {
+; CHECK-LABEL: @trunc_i64_to_i32_store
+; CHECK: S_LOAD_DWORD SGPR0, SGPR0_SGPR1, 11
+; CHECK: V_MOV_B32_e32 VGPR0, SGPR0
+; CHECK: BUFFER_STORE_DWORD VGPR0
+  %result = trunc i64 %in to i32 store i32 %result, i32 addrspace(1)*
+  %out, align 4 ret void
+}
+
+; This function ends up being empty?
+; define i32 @trunc_i64_to_i32(i64 %in) {
+;   %result = trunc i64 %in to i32
+;   ret i32 %result
+; }
+
+
+; sc produces:
+; shader main asic(SI) type(CS)
+;   s_buffer_load_dword s0, s[8:11], 0x00 // 00000000: C2000900
+;   s_buffer_load_dword s1, s[8:11], 0x04 // 00000004: C2008904
+;   s_waitcnt lgkmcnt(0) // 00000008: BF8C007F v_mov_b32 v0, s0 //
+;   0000000C: 7E000200 v_mov_b32 v1, s1 // 00000010: 7E020201
+;   tbuffer_store_format_x v1, v0, s[4:7], 0 offen
+;   format:[BUF_DATA_FORMAT_32,BUF_NUM_FORMAT_FLOAT] // 00000014:
+;   EBA41000 80010100 s_endpgm // 0000001C: BF810000 end
+
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