R600: Expand mad24 for GPUs without it

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209457 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/R600/AMDGPUInstructions.td

@@ -433,6 +433,16 @@ class UMad24Pat<Instruction Inst> : Pat <
   (Inst $src0, $src1, $src2)
 >;
 
+class IMad24ExpandPat<Instruction MulInst, Instruction AddInst> : Pat <
+  (AMDGPUmad_i24 i32:$src0, i32:$src1, i32:$src2),
+  (AddInst (MulInst $src0, $src1), $src2)
+>;
+
+class UMad24ExpandPat<Instruction MulInst, Instruction AddInst> : Pat <
+  (AMDGPUmad_u24 i32:$src0, i32:$src1, i32:$src2),
+  (AddInst (MulInst $src0, $src1), $src2)
+>;
+
 
 include "R600Instructions.td"
 include "R700Instructions.td"

lib/Target/R600/CaymanInstructions.td

@@ -49,6 +49,7 @@ def COS_cm : COS_Common<0x8E>;
 def : POW_Common <LOG_IEEE_cm, EXP_IEEE_cm, MUL>;
 
 defm DIV_cm : DIV_Common<RECIP_IEEE_cm>;
+def : UMad24ExpandPat<MULLO_UINT_cm, ADD_INT>;
 
 // RECIP_UINT emulation for Cayman
 // The multiplication scales from [0,1] to the unsigned integer range

lib/Target/R600/EvergreenInstructions.td

@@ -75,6 +75,9 @@ def COS_eg : COS_Common<0x8E>;
 def : POW_Common <LOG_IEEE_eg, EXP_IEEE_eg, MUL>;
 def : Pat<(fsqrt f32:$src), (MUL $src, (RECIPSQRT_CLAMPED_eg $src))>;
 
+def : IMad24ExpandPat<MULLO_INT_eg, ADD_INT>;
+def : UMad24ExpandPat<MULLO_UINT_eg, ADD_INT>;
+
 //===----------------------------------------------------------------------===//
 // Memory read/write instructions
 //===----------------------------------------------------------------------===//
@@ -301,8 +304,11 @@ def BFM_INT_eg : R600_2OP <0xA0, "BFM_INT",
 >;
 
 def MULADD_UINT24_eg : R600_3OP <0x10, "MULADD_UINT24",
-  [(set i32:$dst, (add (AMDGPUmul_u24 i32:$src0, i32:$src1), i32:$src2))], VecALU
+  [(set i32:$dst, (AMDGPUmad_u24 i32:$src0, i32:$src1, i32:$src2))], VecALU
 >;
+
+def : UMad24Pat<MULADD_UINT24_eg>;
+
 def BIT_ALIGN_INT_eg : R600_3OP <0xC, "BIT_ALIGN_INT", [], VecALU>;
 def : ROTRPattern <BIT_ALIGN_INT_eg>;
 def MULADD_eg : MULADD_Common<0x14>;

lib/Target/R600/R600Instructions.td

@@ -1625,6 +1625,12 @@ def : DwordAddrPat  <i32, R600_Reg32>;
 
 } // End isR600toCayman Predicate
 
+let Predicates = [isR600] in {
+// Intrinsic patterns
+def : IMad24ExpandPat<MULLO_INT_r600, ADD_INT>;
+def : UMad24ExpandPat<MULLO_UINT_r600, ADD_INT>;
+} // End isR600
+
 def getLDSNoRetOp : InstrMapping {
   let FilterClass = "R600_LDS_1A1D";
   let RowFields = ["BaseOp"];

test/CodeGen/R600/llvm.AMDGPU.imad24.ll

@@ -1,11 +1,18 @@
 ; RUN: llc -march=r600 -mcpu=SI -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
 ; RUN: llc -march=r600 -mcpu=cayman -verify-machineinstrs < %s | FileCheck -check-prefix=CM -check-prefix=FUNC %s
+; RUN: llc -march=r600 -mcpu=redwood -verify-machineinstrs < %s | FileCheck -check-prefix=R600 -check-prefix=FUNC %s
+; XUN: llc -march=r600 -mcpu=r600 -verify-machineinstrs < %s | FileCheck -check-prefix=R600 -check-prefix=FUNC %s
+; XUN: llc -march=r600 -mcpu=r770 -verify-machineinstrs < %s | FileCheck -check-prefix=R600 -check-prefix=FUNC %s
+
+; FIXME: Store of i32 seems to be broken pre-EG somehow?
 
 declare i32 @llvm.AMDGPU.imad24(i32, i32, i32) nounwind readnone
 
 ; FUNC-LABEL: @test_imad24
 ; SI: V_MAD_I32_I24
 ; CM: MULADD_INT24
+; R600: MULLO_INT
+; R600: ADD_INT
 define void @test_imad24(i32 addrspace(1)* %out, i32 %src0, i32 %src1, i32 %src2) nounwind {
   %mad = call i32 @llvm.AMDGPU.imad24(i32 %src0, i32 %src1, i32 %src2) nounwind readnone
   store i32 %mad, i32 addrspace(1)* %out, align 4

test/CodeGen/R600/llvm.AMDGPU.umad24.ll

@@ -1,9 +1,16 @@
 ; RUN: llc -march=r600 -mcpu=SI -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
+; RUN: llc -march=r600 -mcpu=cayman -verify-machineinstrs < %s | FileCheck -check-prefix=EG -check-prefix=FUNC %s
+; RUN: llc -march=r600 -mcpu=redwood -verify-machineinstrs < %s | FileCheck -check-prefix=EG -check-prefix=FUNC %s
+; XUN: llc -march=r600 -mcpu=r600 -verify-machineinstrs < %s | FileCheck -check-prefix=R600 -check-prefix=FUNC %s
+; XUN: llc -march=r600 -mcpu=rv770 -verify-machineinstrs < %s | FileCheck -check-prefix=R600 -check-prefix=FUNC %s
 
 declare i32 @llvm.AMDGPU.umad24(i32, i32, i32) nounwind readnone
 
 ; FUNC-LABEL: @test_umad24
 ; SI: V_MAD_U32_U24
+; EG: MULADD_UINT24
+; R600: MULLO_UINT
+; R600: ADD_INT
 define void @test_umad24(i32 addrspace(1)* %out, i32 %src0, i32 %src1, i32 %src2) nounwind {
   %mad = call i32 @llvm.AMDGPU.umad24(i32 %src0, i32 %src1, i32 %src2) nounwind readnone
   store i32 %mad, i32 addrspace(1)* %out, align 4