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MC: support different sized constants in constant pools

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On AArch64 the pseudo instruction ldr <reg>, =... supports both
32-bit and 64-bit constants. Add support for 64 bit constants for
the pools to support the pseudo instruction fully.

Changes the AArch64 ldr-pseudo tests to use 32-bit registers and
adds tests with 64-bit registers.

Patch by Janne Grunau!

Differential Revision: http://reviews.llvm.org/D4279



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213387 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Peixotto
2014-07-18 16:05:14 +00:00
parent 11af4b49b2
commit 12f33da20b
10 changed files with 200 additions and 67 deletions
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16
include/llvm/MC/ConstantPools.h
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@@ -22,10 +22,17 @@ class MCExpr;
class MCSection;
class MCStreamer;
class MCSymbol;
struct ConstantPoolEntry {
MCSymbol *Label;
const MCExpr *Value;
unsigned Size;
};
// A class to keep track of assembler-generated constant pools that are use to
// implement the ldr-pseudo.
class ConstantPool {
typedef SmallVector<std::pair<MCSymbol *, const MCExpr *>, 4> EntryVecTy;
typedef SmallVector<ConstantPoolEntry, 4> EntryVecTy;
EntryVecTy Entries;
public:
@@ -34,9 +41,11 @@ public:
// Add a new entry to the constant pool in the next slot.
// \param Value is the new entry to put in the constant pool.
// \param Size is the size in bytes of the entry
//
// \returns a MCExpr that references the newly inserted value
const MCExpr *addEntry(const MCExpr *Value, MCContext &Context);
const MCExpr *addEntry(const MCExpr *Value, MCContext &Context,
unsigned Size);
// Emit the contents of the constant pool using the provided streamer.
void emitEntries(MCStreamer &Streamer);
@@ -69,7 +78,8 @@ public:
void emitAll(MCStreamer &Streamer);
void emitForCurrentSection(MCStreamer &Streamer);
const MCExpr *addEntry(MCStreamer &Streamer, const MCExpr *Expr);
const MCExpr *addEntry(MCStreamer &Streamer, const MCExpr *Expr,
unsigned Size);
private:
ConstantPool *getConstantPool(const MCSection *Section);