http://llvm.org/bugs/show_bug.cgi?id=14093
Bug #: 14093
Summary: pattern class does not work
Product: tools
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: TableGen
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Pat and ComplexPattern work but not Pattern
class Pattern<dag patternToMatch, list<dag> resultInstrs> {
dag PatternToMatch = patternToMatch;
list<dag> ResultInstrs = resultInstrs;
list<Predicate> Predicates = []; // See class Instruction in Target.td.
int AddedComplexity = 0; // See class Instruction in Target.td.
}
I get an error:
Cannot handle instructions with temporaries yet!
When I try and use it.
Here is a simple place I wanted to use it.
...
On multiply, the result implicit is placed in a 64 bit hi/lo register.
//
// Format: MFLO rx MIPS16e
// Purpose: Move From LO Register
// To copy the special purpose LO register to a GPR.
//
def Mflo16: FRR16_M_ins<0b10010, "mflo", IIAlu> {
let Uses = [LO];
let neverHasSideEffects = 1;
}
//
// Pseudo Instruction for mult
//
def MultRxRy16: FMULT16_ins<"mult", IIAlu> {
let isCommutable = 1;
let neverHasSideEffects = 1;
let Defs = [HI, LO];
}
def: Mips16Pattern<(mul CPU16Regs:$l, CPU16Regs:$r),
[(MultRxRyRz16 CPU16Regs:$l, CPU16Regs:$r), (Mflo16) ]>;
Without the list of instructions feature in the Pattern class, I am forced to
make a pseudo that has both the mul and mflo instruction in it.
This is a very simple example and some, like for example the conditional move
have 3 instructions with sequences like:
cmp x,y
bnez .+4
move a, b
I am able to do all of this just fine with pseudo's but it's not as clean a
solution.
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