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Clean up and fix cast codegen by removing cases that are handled elsewhere,

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and properly emitting signed short to unsigned int.  This fixes the last
regression vs. the CBE, MultiSource/Applications/hbd.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17942 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman 2004-11-18 04:56:53 +00:00
parent 5c401af433
commit 0113638073
1 changed files with 8 additions and 19 deletions
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27
lib/Target/PowerPC/PPC32ISelSimple.cpp
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@ -3561,16 +3561,11 @@ void PPC32ISel::emitCastOperation(MachineBasicBlock *MBB,
// handle { byte, short, int } x { byte, short, int }
switch (SrcClass) {
case cByte:
if (DestClass == cByte)
BuildMI(*MBB, IP, PPC::OR, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
else
BuildMI(*MBB, IP, PPC::EXTSB, 1, DestReg).addReg(SrcReg);
BuildMI(*MBB, IP, PPC::EXTSB, 1, DestReg).addReg(SrcReg);
break;
case cShort:
if (DestClass == cByte)
BuildMI(*MBB, IP, PPC::EXTSB, 1, DestReg).addReg(SrcReg);
else if (DestClass == cShort)
BuildMI(*MBB, IP, PPC::OR, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
else
BuildMI(*MBB, IP, PPC::EXTSH, 1, DestReg).addReg(SrcReg);
break;
@ -3608,19 +3603,13 @@ void PPC32ISel::emitCastOperation(MachineBasicBlock *MBB,
// handle u{ byte, short, int } -> { byte, short, int }
switch (SrcClass) {
case cByte:
if (DestClass == cByte)
// uByte 255 -> signed byte == -1
BuildMI(*MBB, IP, PPC::EXTSB, 1, DestReg).addReg(SrcReg);
else
// uByte 255 -> signed short/int == 255
BuildMI(*MBB, IP, PPC::RLWINM, 4, DestReg).addReg(SrcReg).addImm(0)
.addImm(24).addImm(31);
// uByte 255 -> signed short/int == 255
BuildMI(*MBB, IP, PPC::RLWINM, 4, DestReg).addReg(SrcReg).addImm(0)
.addImm(24).addImm(31);
break;
case cShort:
if (DestClass == cByte)
BuildMI(*MBB, IP, PPC::EXTSB, 1, DestReg).addReg(SrcReg);
else if (DestClass == cShort)
BuildMI(*MBB, IP, PPC::EXTSH, 1, DestReg).addReg(SrcReg);
else
BuildMI(*MBB, IP, PPC::RLWINM, 4, DestReg).addReg(SrcReg).addImm(0)
.addImm(16).addImm(31);
@ -3660,14 +3649,14 @@ void PPC32ISel::emitCastOperation(MachineBasicBlock *MBB,
unsigned clearBits = (DestClass == cByte) ? 24 : 16;
switch (SrcClass) {
case cByte:
BuildMI(*MBB, IP, PPC::EXTSB, 1, DestReg).addReg(SrcReg);
break;
case cShort:
if (DestClass == cByte || DestClass == cShort)
// sbyte -1 -> ubyte 0x000000FF
if (DestClass == cByte)
BuildMI(*MBB, IP, PPC::RLWINM, 4, DestReg).addReg(SrcReg)
.addImm(0).addImm(clearBits).addImm(31);
else
// sbyte -1 -> ubyte 0xFFFFFFFF
BuildMI(*MBB, IP, PPC::OR, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
BuildMI(*MBB, IP, PPC::EXTSH, 1, DestReg).addReg(SrcReg);
break;
case cLong:
++SrcReg;