Move mips' datalayout computation out of line and add comments.
llvm-svn: 196996
diff --git a/llvm/lib/Target/Mips/MipsTargetMachine.cpp b/llvm/lib/Target/Mips/MipsTargetMachine.cpp
index ab5677a..e476488 100644
--- a/llvm/lib/Target/Mips/MipsTargetMachine.cpp
+++ b/llvm/lib/Target/Mips/MipsTargetMachine.cpp
@@ -45,8 +45,36 @@
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 @@
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),