search for: x86fmsub

Displaying 3 results from an estimated 3 matches for "x86fmsub".

2012 Nov 16
2
[LLVMdev] Operand order in dag pattern matching in td files
...!strconcat(OpcodeStr, "\t{$src3, $src2, $dst|$dst, $src2, $src3}"), [(set RC:$dst, (OpVT (OpNode RC:$src2, RC:$src1, RC:$src3)))]>; Given that it is an FMA pattern, the OpNode can be one of X86Fmadd, X86Fmsub (among other opnodes). The respective operations are : (a*b+c) and (a*b-c). My questions are: 1. Why does $src2 and not $src1 come first in (OpNode RC:$src2, RC:$src1, RC:$src3) ? In other words what is the difference between (a) and (b): (a) [(set RC:$dst, (OpVT (OpNode RC:$src2, RC:$src1,...
2012 Nov 16
0
[LLVMdev] Operand order in dag pattern matching in td files
...tr, > "\t{$src3, $src2, $dst|$dst, $src2, $src3}"), > [(set RC:$dst, > (OpVT (OpNode RC:$src2, RC:$src1, RC:$src3)))]>; > > > Given that it is an FMA pattern, the OpNode can be one of X86Fmadd, > X86Fmsub (among other opnodes). The respective operations are : > (a*b+c) and (a*b-c). My questions are: > > 1. Why does $src2 and not $src1 come first in (OpNode RC:$src2, > RC:$src1, RC:$src3) ? In other words what is the difference between > (a) and (b): > (a) [(set RC:$dst, (OpV...
2012 Nov 16
1
[LLVMdev] Operand order in dag pattern matching in td files
..."\t{$src3, $src2, $dst|$dst, $src2, > $src3}"), > > [(set RC:$dst, > > (OpVT (OpNode RC:$src2, RC:$src1, RC:$src3)))]>; > > > > > > Given that it is an FMA pattern, the OpNode can be one of X86Fmadd, > > X86Fmsub (among other opnodes). The respective operations are : > > (a*b+c) and (a*b-c). My questions are: > > > > 1. Why does $src2 and not $src1 come first in (OpNode RC:$src2, > > RC:$src1, RC:$src3) ? In other words what is the difference between > > (a) and (b): > >...