From b4b54153ad760c69a00a08531abef4ed434a5092 Mon Sep 17 00:00:00 2001
From: Tony Linthicum <tlinth@codeaurora.org>
Date: Mon, 12 Dec 2011 21:14:40 +0000
Subject: Hexagon backend support

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146412 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/Hexagon/HexagonSelectCCInfo.td | 121 ++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 lib/Target/Hexagon/HexagonSelectCCInfo.td

(limited to 'lib/Target/Hexagon/HexagonSelectCCInfo.td')

diff --git a/lib/Target/Hexagon/HexagonSelectCCInfo.td b/lib/Target/Hexagon/HexagonSelectCCInfo.td
new file mode 100644
index 0000000000..f21d928c77
--- /dev/null
+++ b/lib/Target/Hexagon/HexagonSelectCCInfo.td
@@ -0,0 +1,121 @@
+//=-HexagoSelectCCInfo.td - Selectcc mappings ----------------*- tablegen -*-=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+//
+// selectcc mappings.
+//
+def : Pat <(i32 (selectcc IntRegs:$lhs, IntRegs:$rhs, IntRegs:$tval,
+                          IntRegs:$fval, SETEQ)),
+      (i32 (MUX_rr (i1 (CMPEQrr IntRegs:$lhs, IntRegs:$rhs)),
+                   IntRegs:$tval, IntRegs:$fval))>;
+
+def : Pat <(i32 (selectcc IntRegs:$lhs, IntRegs:$rhs, IntRegs:$tval,
+                          IntRegs:$fval, SETNE)),
+      (i32 (MUX_rr (i1 (NOT_Ps (CMPEQrr IntRegs:$lhs, IntRegs:$rhs))),
+                   IntRegs:$tval, IntRegs:$fval))>;
+
+def : Pat <(i32 (selectcc IntRegs:$lhs, IntRegs:$rhs, IntRegs:$tval,
+                          IntRegs:$fval, SETGT)),
+      (i32 (MUX_rr (i1 (CMPGTrr IntRegs:$lhs, IntRegs:$rhs)),
+                   IntRegs:$tval, IntRegs:$fval))>;
+
+def : Pat <(i32 (selectcc IntRegs:$lhs, IntRegs:$rhs, IntRegs:$tval,
+                          IntRegs:$fval, SETUGT)),
+      (i32 (MUX_rr (i1 (CMPGTUrr IntRegs:$lhs, IntRegs:$rhs)),
+                   IntRegs:$tval, IntRegs:$fval))>;
+
+
+
+def : Pat <(i32 (selectcc IntRegs:$lhs, IntRegs:$rhs, IntRegs:$tval,
+                          IntRegs:$fval, SETULT)),
+      (i32 (MUX_rr (i1 (NOT_Ps (CMPGTUrr IntRegs:$lhs,
+                                         (ADD_ri IntRegs:$rhs, -1)))),
+                   IntRegs:$tval, IntRegs:$fval))>;
+
+def : Pat <(i32 (selectcc IntRegs:$lhs, IntRegs:$rhs, IntRegs:$tval,
+                          IntRegs:$fval, SETLT)),
+      (i32 (MUX_rr (i1 (NOT_Ps (CMPGTrr IntRegs:$lhs,
+                                        (ADD_ri IntRegs:$rhs, -1)))),
+                   IntRegs:$tval, IntRegs:$fval))>;
+
+def : Pat <(i32 (selectcc IntRegs:$lhs, IntRegs:$rhs, IntRegs:$tval,
+                          IntRegs:$fval, SETLE)),
+      (i32 (MUX_rr (i1 (NOT_Ps (CMPGTrr IntRegs:$lhs, IntRegs:$rhs))),
+                   IntRegs:$tval, IntRegs:$fval))>;
+
+def : Pat <(i32 (selectcc IntRegs:$lhs, IntRegs:$rhs, IntRegs:$tval,
+                          IntRegs:$fval, SETULE)),
+      (i32 (MUX_rr (i1 (NOT_Ps (CMPGTUrr IntRegs:$lhs, IntRegs:$rhs))),
+                   IntRegs:$tval, IntRegs:$fval))>;
+
+
+//
+// selectcc mappings for greater-equal-to Rs => greater-than Rs-1.
+//
+def : Pat <(i32 (selectcc IntRegs:$lhs, IntRegs:$rhs, IntRegs:$tval,
+                          IntRegs:$fval, SETGE)),
+      (i32 (MUX_rr (i1 (CMPGTrr IntRegs:$lhs, (ADD_ri IntRegs:$rhs, -1))),
+                   IntRegs:$tval, IntRegs:$fval))>;
+
+def : Pat <(i32 (selectcc IntRegs:$lhs, IntRegs:$rhs, IntRegs:$tval,
+                          IntRegs:$fval, SETUGE)),
+      (i32 (MUX_rr (i1 (CMPGTUrr IntRegs:$lhs, (ADD_ri IntRegs:$rhs, -1))),
+                   IntRegs:$tval, IntRegs:$fval))>;
+
+
+
+//
+// selectcc mappings for predicate comparisons.
+//
+// Convert Rd = selectcc(p0, p1, true_val, false_val, SETEQ) into:
+//  pt = not(p1 xor p2)
+//  Rd = mux(pt, true_val, false_val)
+// and similarly for SETNE
+//
+def : Pat <(i32 (selectcc PredRegs:$lhs, PredRegs:$rhs, IntRegs:$tval,
+                          IntRegs:$fval, SETNE)),
+      (i32 (MUX_rr (i1 (XOR_pp PredRegs:$lhs, PredRegs:$rhs)), IntRegs:$tval,
+                   IntRegs:$fval))>;
+
+def : Pat <(i32 (selectcc PredRegs:$lhs, PredRegs:$rhs, IntRegs:$tval,
+                          IntRegs:$fval, SETEQ)),
+      (i32 (MUX_rr (i1 (NOT_pp (XOR_pp PredRegs:$lhs, PredRegs:$rhs))),
+                   IntRegs:$tval, IntRegs:$fval))>;
+
+
+//
+// selectcc mappings for 64-bit operands are messy. Hexagon does not have a
+// MUX64 o, use this:
+// selectcc(Rss, Rdd, tval, fval, cond) ->
+//   combine(mux(cmp_cond(Rss, Rdd), tval.hi, fval.hi),
+//           mux(cmp_cond(Rss, Rdd), tval.lo, fval.lo))
+
+// setgt-64.
+def : Pat<(i64 (selectcc DoubleRegs:$lhs, DoubleRegs:$rhs, DoubleRegs:$tval,
+                         DoubleRegs:$fval, SETGT)),
+      (COMBINE_rr (MUX_rr (CMPGT64rr DoubleRegs:$lhs, DoubleRegs:$rhs),
+                           (EXTRACT_SUBREG DoubleRegs:$tval, subreg_hireg),
+                           (EXTRACT_SUBREG DoubleRegs:$fval, subreg_hireg)),
+                   (MUX_rr (CMPGT64rr DoubleRegs:$lhs, DoubleRegs:$rhs),
+                           (EXTRACT_SUBREG DoubleRegs:$tval, subreg_loreg),
+                           (EXTRACT_SUBREG DoubleRegs:$fval, subreg_loreg)))>;
+
+
+// setlt-64 -> setgt-64.
+def : Pat<(i64 (selectcc DoubleRegs:$lhs, DoubleRegs:$rhs, DoubleRegs:$tval,
+                         DoubleRegs:$fval, SETLT)),
+      (COMBINE_rr (MUX_rr (CMPGT64rr DoubleRegs:$lhs,
+                                     (ADD64_rr DoubleRegs:$rhs, (TFRI64 -1))),
+                           (EXTRACT_SUBREG DoubleRegs:$tval, subreg_hireg),
+                           (EXTRACT_SUBREG DoubleRegs:$fval, subreg_hireg)),
+                   (MUX_rr (CMPGT64rr DoubleRegs:$lhs,
+                                      (ADD64_rr DoubleRegs:$rhs, (TFRI64 -1))),
+                           (EXTRACT_SUBREG DoubleRegs:$tval, subreg_loreg),
+                           (EXTRACT_SUBREG DoubleRegs:$fval, subreg_loreg)))>;
-- 
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