maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

[PowerPC] Fix emitting instruction pairs on LE 

My patch r204634 to emit instructions in little-endian format failed to
handle those special cases where we emit a pair of instructions from a
single LLVM MC instructions (like the bl; nop pairs used to implement
the call sequence).

In those cases, we still need to emit the "first" instruction (the one
in the more significant word) first, on both big and little endian,
and not swap them.

llvm-svn: 211171
This commit is contained in:
Ulrich Weigand 2014-06-18 15:37:07 +00:00
parent 457e606d1f
commit 7c3f0dc7e4
1 changed files with 37 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.cpp
View File

@ -102,17 +102,45 @@ public:
// Output the constant in big/little endian byte order.
unsigned Size = Desc.getSize();
if (IsLittleEndian) {
for (unsigned i = 0; i != Size; ++i) {
OS << (char)Bits;
Bits >>= 8;
switch (Size) {
case 4:
if (IsLittleEndian) {
OS << (char)(Bits);
OS << (char)(Bits >> 8);
OS << (char)(Bits >> 16);
OS << (char)(Bits >> 24);
} else {
OS << (char)(Bits >> 24);
OS << (char)(Bits >> 16);
OS << (char)(Bits >> 8);
OS << (char)(Bits);
}
} else {
int ShiftValue = (Size * 8) - 8;
for (unsigned i = 0; i != Size; ++i) {
OS << (char)(Bits >> ShiftValue);
Bits <<= 8;
break;
case 8:
// If we emit a pair of instructions, the first one is
// always in the top 32 bits, even on little-endian.
if (IsLittleEndian) {
OS << (char)(Bits >> 32);
OS << (char)(Bits >> 40);
OS << (char)(Bits >> 48);
OS << (char)(Bits >> 56);
OS << (char)(Bits);
OS << (char)(Bits >> 8);
OS << (char)(Bits >> 16);
OS << (char)(Bits >> 24);
} else {
OS << (char)(Bits >> 56);
OS << (char)(Bits >> 48);
OS << (char)(Bits >> 40);
OS << (char)(Bits >> 32);
OS << (char)(Bits >> 24);
OS << (char)(Bits >> 16);
OS << (char)(Bits >> 8);
OS << (char)(Bits);
}
break;
default:
llvm_unreachable ("Invalid instruction size");
}
++MCNumEmitted; // Keep track of the # of mi's emitted.