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Move mips' datalayout computation out of line and add comments.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196996 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2013-12-11 01:41:10 +00:00
parent a3b00b504e
commit 8514590ee9
1 changed files with 31 additions and 11 deletions
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42
lib/Target/Mips/MipsTargetMachine.cpp
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@ -45,8 +45,36 @@ extern "C" void LLVMInitializeMipsTarget() {
RegisterTargetMachine<MipselTargetMachine> B(TheMips64elTarget);
}
// DataLayout --> Big-endian, 32-bit pointer/ABI/alignment
// The stack is always 8 byte aligned
static std::string computeDataLayout(const MipsSubtarget &ST) {
std::string Ret = "";
// There are both little and big endian mips.
if (ST.isLittle())
Ret += "e";
else
Ret += "E";
// Pointers are 64 or 32 bit depending on the ABI.
if (ST.isABI_N64())
Ret += "-p:64:64:64";
else
Ret += "-p:32:32:32";
// 8 and 16 bit integers only need no have natural alignment, but try to
// align them to 32 bits. 64 bit integers have natural alignment.
Ret += "-i8:8:32-i16:16:32-i64:64:64";
// 32 bit registers are always available and the stack is at least 64 bit
// aligned. On N64 64 bit registers are also available and the stack is
// 128 bit aligned.
if (ST.isABI_N64())
Ret += "-n32:64-S128";
else
Ret += "-n32-S64";
return Ret;
}
// On function prologue, the stack is created by decrementing
// its pointer. Once decremented, all references are done with positive
// offset from the stack/frame pointer, using StackGrowsUp enables
@ -60,15 +88,7 @@ MipsTargetMachine(const Target &T, StringRef TT,
bool isLittle)
: LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
Subtarget(TT, CPU, FS, isLittle, RM, this),
DL(isLittle ?
(Subtarget.isABI_N64() ?
"e-p:64:64:64-i8:8:32-i16:16:32-i64:64:64-f128:128:128-"
"n32:64-S128" :
"e-p:32:32:32-i8:8:32-i16:16:32-i64:64:64-n32-S64") :
(Subtarget.isABI_N64() ?
"E-p:64:64:64-i8:8:32-i16:16:32-i64:64:64-f128:128:128-"
"n32:64-S128" :
"E-p:32:32:32-i8:8:32-i16:16:32-i64:64:64-n32-S64")),
DL(computeDataLayout(Subtarget)),
InstrInfo(MipsInstrInfo::create(*this)),
FrameLowering(MipsFrameLowering::create(*this, Subtarget)),
TLInfo(MipsTargetLowering::create(*this)), TSInfo(*this),