From 55945607667e71dc1d4d32cffa60e3b817f2f3ef Mon Sep 17 00:00:00 2001
From: Bruno Cardoso Lopes <bruno.cardoso@gmail.com>
Date: Thu, 2 Sep 2010 21:51:11 +0000
Subject: Move decoding of insertps back to avoid unused warnings in x86 isel
 lowering, and fix movlhps/movhlps to decode 4 elements shuffles

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112869 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/AsmPrinter/X86InstComments.cpp | 32 ++++++++++++++++++--
 lib/Target/X86/X86ShuffleDecode.h             | 42 +++++++++------------------
 2 files changed, 44 insertions(+), 30 deletions(-)

(limited to 'lib')

diff --git a/lib/Target/X86/AsmPrinter/X86InstComments.cpp b/lib/Target/X86/AsmPrinter/X86InstComments.cpp
index fa1e50b153..61f5065211 100644
--- a/lib/Target/X86/AsmPrinter/X86InstComments.cpp
+++ b/lib/Target/X86/AsmPrinter/X86InstComments.cpp
@@ -19,6 +19,34 @@
 #include "../X86ShuffleDecode.h"
 using namespace llvm;
 
+//===----------------------------------------------------------------------===//
+//  Vector Mask Decoding for non-shuffles
+//===----------------------------------------------------------------------===//
+
+static void DecodeINSERTPSMask(unsigned Imm,
+                               SmallVectorImpl<unsigned> &ShuffleMask) {
+  // Defaults the copying the dest value.
+  ShuffleMask.push_back(0);
+  ShuffleMask.push_back(1);
+  ShuffleMask.push_back(2);
+  ShuffleMask.push_back(3);
+
+  // Decode the immediate.
+  unsigned ZMask = Imm & 15;
+  unsigned CountD = (Imm >> 4) & 3;
+  unsigned CountS = (Imm >> 6) & 3;
+
+  // CountS selects which input element to use.
+  unsigned InVal = 4+CountS;
+  // CountD specifies which element of destination to update.
+  ShuffleMask[CountD] = InVal;
+  // ZMask zaps values, potentially overriding the CountD elt.
+  if (ZMask & 1) ShuffleMask[0] = SM_SentinelZero;
+  if (ZMask & 2) ShuffleMask[1] = SM_SentinelZero;
+  if (ZMask & 4) ShuffleMask[2] = SM_SentinelZero;
+  if (ZMask & 8) ShuffleMask[3] = SM_SentinelZero;
+}
+
 //===----------------------------------------------------------------------===//
 // Top Level Entrypoint
 //===----------------------------------------------------------------------===//
@@ -42,13 +70,13 @@ void llvm::EmitAnyX86InstComments(const MCInst *MI, raw_ostream &OS,
   case X86::MOVLHPSrr:
     Src2Name = getRegName(MI->getOperand(2).getReg());
     Src1Name = getRegName(MI->getOperand(0).getReg());
-    DecodeMOVLHPSMask(ShuffleMask);
+    DecodeMOVLHPSMask(2, ShuffleMask);
     break;
 
   case X86::MOVHLPSrr:
     Src2Name = getRegName(MI->getOperand(2).getReg());
     Src1Name = getRegName(MI->getOperand(0).getReg());
-    DecodeMOVHLPSMask(ShuffleMask);
+    DecodeMOVHLPSMask(2, ShuffleMask);
     break;
 
   case X86::PSHUFDri:
diff --git a/lib/Target/X86/X86ShuffleDecode.h b/lib/Target/X86/X86ShuffleDecode.h
index 4d24c839f5..818f7ca74b 100644
--- a/lib/Target/X86/X86ShuffleDecode.h
+++ b/lib/Target/X86/X86ShuffleDecode.h
@@ -26,38 +26,24 @@ enum {
   SM_SentinelZero = ~0U
 };
 
-static void DecodeINSERTPSMask(unsigned Imm,
-                               SmallVectorImpl<unsigned> &ShuffleMask) {
-  // Defaults the copying the dest value.
-  ShuffleMask.push_back(0);
-  ShuffleMask.push_back(1);
-  ShuffleMask.push_back(2);
-  ShuffleMask.push_back(3);
+// <3,1> or <6,7,2,3>
+static void DecodeMOVHLPSMask(unsigned NElts,
+                              SmallVectorImpl<unsigned> &ShuffleMask) {
+  for (unsigned i = NElts/2; i != NElts; ++i)
+    ShuffleMask.push_back(NElts+i);
 
-  // Decode the immediate.
-  unsigned ZMask = Imm & 15;
-  unsigned CountD = (Imm >> 4) & 3;
-  unsigned CountS = (Imm >> 6) & 3;
-
-  // CountS selects which input element to use.
-  unsigned InVal = 4+CountS;
-  // CountD specifies which element of destination to update.
-  ShuffleMask[CountD] = InVal;
-  // ZMask zaps values, potentially overriding the CountD elt.
-  if (ZMask & 1) ShuffleMask[0] = SM_SentinelZero;
-  if (ZMask & 2) ShuffleMask[1] = SM_SentinelZero;
-  if (ZMask & 4) ShuffleMask[2] = SM_SentinelZero;
-  if (ZMask & 8) ShuffleMask[3] = SM_SentinelZero;
+  for (unsigned i = NElts/2; i != NElts; ++i)
+    ShuffleMask.push_back(i);
 }
 
-static void DecodeMOVHLPSMask(SmallVectorImpl<unsigned> &ShuffleMask) {
-  ShuffleMask.push_back(3);
-  ShuffleMask.push_back(1);
-}
+// <0,2> or <0,1,4,5>
+static void DecodeMOVLHPSMask(unsigned NElts,
+                              SmallVectorImpl<unsigned> &ShuffleMask) {
+  for (unsigned i = 0; i != NElts/2; ++i)
+    ShuffleMask.push_back(i);
 
-static void DecodeMOVLHPSMask(SmallVectorImpl<unsigned> &ShuffleMask) {
-  ShuffleMask.push_back(0);
-  ShuffleMask.push_back(2);
+  for (unsigned i = 0; i != NElts/2; ++i)
+    ShuffleMask.push_back(NElts+i);
 }
 
 static void DecodePSHUFMask(unsigned NElts, unsigned Imm,
-- 
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