R600: Add pattern for the BFI_INT instruction

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179830 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/R600/AMDGPUInstructions.td

@@ -261,6 +261,26 @@ class DwordAddrPat<ValueType vt, RegisterClass rc> : Pat <
   (vt rc:$addr)
 >;
 
+// BFI_INT patterns
+
+multiclass BFIPatterns <Instruction BFI_INT> {
+
+  // Definition from ISA doc:
+  // (y & x) | (z & ~x)
+  def : Pat <
+    (or (and i32:$y, i32:$x), (and i32:$z, (not i32:$x))),
+    (BFI_INT $x, $y, $z)
+  >;
+
+  // SHA-256 Ch function
+  // z ^ (x & (y ^ z))
+  def : Pat <
+    (xor i32:$z, (and i32:$x, (xor i32:$y, i32:$z))),
+    (BFI_INT $x, $y, $z)
+  >;
+
+}
+
 include "R600Instructions.td"
 
 include "SIInstrInfo.td"

lib/Target/R600/R600Instructions.td

@@ -1570,6 +1570,9 @@ let Predicates = [isEGorCayman] in {
     VecALU
   >;
 
+  def BFI_INT_eg : R600_3OP <0x06, "BFI_INT", []>;
+  defm : BFIPatterns <BFI_INT_eg>;
+
   def BIT_ALIGN_INT_eg : R600_3OP <0xC, "BIT_ALIGN_INT",
     [(set R600_Reg32:$dst, (AMDGPUbitalign R600_Reg32:$src0, R600_Reg32:$src1,
                                           R600_Reg32:$src2))],

lib/Target/R600/SIInstructions.td

@@ -948,6 +948,7 @@ def V_CUBEMA_F32 : VOP3_32 <0x00000147, "V_CUBEMA_F32", []>;
 def V_BFE_U32 : VOP3_32 <0x00000148, "V_BFE_U32", []>;
 def V_BFE_I32 : VOP3_32 <0x00000149, "V_BFE_I32", []>;
 def V_BFI_B32 : VOP3_32 <0x0000014a, "V_BFI_B32", []>;
+defm : BFIPatterns <V_BFI_B32>;
 def V_FMA_F32 : VOP3_32 <0x0000014b, "V_FMA_F32", []>;
 def V_FMA_F64 : VOP3_64 <0x0000014c, "V_FMA_F64", []>;
 //def V_LERP_U8 : VOP3_U8 <0x0000014d, "V_LERP_U8", []>;

test/CodeGen/R600/bfi_int.ll

@@ -0,0 +1,34 @@
+; RUN: llc < %s -march=r600 -mcpu=redwood | FileCheck --check-prefix=R600-CHECK %s
+; RUN: llc < %s -march=r600 -mcpu=SI | FileCheck --check-prefix=SI-CHECK %s
+
+; BFI_INT Definition pattern from ISA docs
+; (y & x) | (z & ~x)
+;
+; R600-CHECK: @bfi_def
+; R600-CHECK: BFI_INT
+; SI-CHECK:   @bfi_def
+; SI-CHECK:   V_BFI_B32
+define void @bfi_def(i32 addrspace(1)* %out, i32 %x, i32 %y, i32 %z) {
+entry:
+  %0 = xor i32 %x, -1
+  %1 = and i32 %z, %0
+  %2 = and i32 %y, %x
+  %3 = or i32 %1, %2
+  store i32 %3, i32 addrspace(1)* %out
+  ret void
+}
+
+; SHA-256 Ch function
+; z ^ (x & (y ^ z))
+; R600-CHECK: @bfi_sha256_ch
+; R600-CHECK: BFI_INT
+; SI-CHECK:   @bfi_sha256_ch
+; SI-CHECK:   V_BFI_B32
+define void @bfi_sha256_ch(i32 addrspace(1)* %out, i32 %x, i32 %y, i32 %z) {
+entry:
+  %0 = xor i32 %y, %z
+  %1 = and i32 %x, %0
+  %2 = xor i32 %z, %1
+  store i32 %2, i32 addrspace(1)* %out
+  ret void
+}