Move x86 specific shuffle mask decoding to its own header, it's also going to be used elsewhere. Also trim trailing whitespaces
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112846 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ShuffleDecode.h b/lib/Target/X86/X86ShuffleDecode.h
new file mode 100644
index 0000000..4d24c83
--- /dev/null
+++ b/lib/Target/X86/X86ShuffleDecode.h
@@ -0,0 +1,145 @@
+//===-- X86ShuffleDecode.h - X86 shuffle decode logic ---------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Define several functions to decode x86 specific shuffle semantics into a
+// generic vector mask.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef X86_SHUFFLE_DECODE_H
+#define X86_SHUFFLE_DECODE_H
+
+#include "llvm/ADT/SmallVector.h"
+using namespace llvm;
+
+//===----------------------------------------------------------------------===//
+// Vector Mask Decoding
+//===----------------------------------------------------------------------===//
+
+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);
+
+ // 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;
+}
+
+static void DecodeMOVHLPSMask(SmallVectorImpl<unsigned> &ShuffleMask) {
+ ShuffleMask.push_back(3);
+ ShuffleMask.push_back(1);
+}
+
+static void DecodeMOVLHPSMask(SmallVectorImpl<unsigned> &ShuffleMask) {
+ ShuffleMask.push_back(0);
+ ShuffleMask.push_back(2);
+}
+
+static void DecodePSHUFMask(unsigned NElts, unsigned Imm,
+ SmallVectorImpl<unsigned> &ShuffleMask) {
+ for (unsigned i = 0; i != NElts; ++i) {
+ ShuffleMask.push_back(Imm % NElts);
+ Imm /= NElts;
+ }
+}
+
+static void DecodePSHUFHWMask(unsigned Imm,
+ SmallVectorImpl<unsigned> &ShuffleMask) {
+ ShuffleMask.push_back(0);
+ ShuffleMask.push_back(1);
+ ShuffleMask.push_back(2);
+ ShuffleMask.push_back(3);
+ for (unsigned i = 0; i != 4; ++i) {
+ ShuffleMask.push_back(4+(Imm & 3));
+ Imm >>= 2;
+ }
+}
+
+static void DecodePSHUFLWMask(unsigned Imm,
+ SmallVectorImpl<unsigned> &ShuffleMask) {
+ for (unsigned i = 0; i != 4; ++i) {
+ ShuffleMask.push_back((Imm & 3));
+ Imm >>= 2;
+ }
+ ShuffleMask.push_back(4);
+ ShuffleMask.push_back(5);
+ ShuffleMask.push_back(6);
+ ShuffleMask.push_back(7);
+}
+
+static void DecodePUNPCKLMask(unsigned NElts,
+ SmallVectorImpl<unsigned> &ShuffleMask) {
+ for (unsigned i = 0; i != NElts/2; ++i) {
+ ShuffleMask.push_back(i);
+ ShuffleMask.push_back(i+NElts);
+ }
+}
+
+static void DecodePUNPCKHMask(unsigned NElts,
+ SmallVectorImpl<unsigned> &ShuffleMask) {
+ for (unsigned i = 0; i != NElts/2; ++i) {
+ ShuffleMask.push_back(i+NElts/2);
+ ShuffleMask.push_back(i+NElts+NElts/2);
+ }
+}
+
+static void DecodeSHUFPSMask(unsigned NElts, unsigned Imm,
+ SmallVectorImpl<unsigned> &ShuffleMask) {
+ // Part that reads from dest.
+ for (unsigned i = 0; i != NElts/2; ++i) {
+ ShuffleMask.push_back(Imm % NElts);
+ Imm /= NElts;
+ }
+ // Part that reads from src.
+ for (unsigned i = 0; i != NElts/2; ++i) {
+ ShuffleMask.push_back(Imm % NElts + NElts);
+ Imm /= NElts;
+ }
+}
+
+static void DecodeUNPCKHPMask(unsigned NElts,
+ SmallVectorImpl<unsigned> &ShuffleMask) {
+ for (unsigned i = 0; i != NElts/2; ++i) {
+ ShuffleMask.push_back(i+NElts/2); // Reads from dest
+ ShuffleMask.push_back(i+NElts+NElts/2); // Reads from src
+ }
+}
+
+
+/// DecodeUNPCKLPMask - This decodes the shuffle masks for unpcklps/unpcklpd
+/// etc. NElts indicates the number of elements in the vector allowing it to
+/// handle different datatypes and vector widths.
+static void DecodeUNPCKLPMask(unsigned NElts,
+ SmallVectorImpl<unsigned> &ShuffleMask) {
+ for (unsigned i = 0; i != NElts/2; ++i) {
+ ShuffleMask.push_back(i); // Reads from dest
+ ShuffleMask.push_back(i+NElts); // Reads from src
+ }
+}
+
+#endif