Displaying 2 results from an estimated 2 matches for "lastinst".
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2010 Dec 14
0
[LLVMdev] Branch delay slots broken.
...e branched to. When this happens it omits the block label and the assembly becomes invalid.
I fixed this in the MBlaze backend by overriding AsmPrinter::isBlockOnlyReachableByFallthrough and replaced (at the end of the function):
// Otherwise, check the last instruction.
const MachineInstr &LastInst = Pred->back();
return !LastInst.getDesc().isBarrier();
with:
// Check if the last terminator is an unconditional branch.
MachineBasicBlock::const_iterator I = Pred->end();
while (I != Pred->begin() && !(--I)->getDesc().isTerminator())
; // Noop
return I == Pred->en...
2010 Dec 14
2
[LLVMdev] Branch delay slots broken.
The Sparc, Microblaze, and Mips code generators implement branch delay
slots. They all seem to exhibit the same bug, which is not surprising
since the code is very similar. If I compile code with this snippit:
while (n--)
*s++ = (char) c;
I get this (for the Microblaze):
swi r19, r1, 0
add r3, r0, r0
cmp r3, r3, r7
beqid r3,