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dea9528f7f
the two operations together. This allows us to compile this:
void %two(int %a, int* %b) {
%tmp.2 = seteq int %a, 0
%tmp.0.0 = select bool %tmp.2, int 10, int 20
store int %tmp.0.0, int* %b
ret void
}
into:
two:
save -96, %o6, %o6
or %g0, 20, %l0
or %g0, 10, %l1
subcc %i0, 0, %l2
be .LBBtwo_2 ! entry
nop
.LBBtwo_1: ! entry
or %g0, %l0, %l1
.LBBtwo_2: ! entry
st %l1, [%i1]
restore %g0, %g0, %g0
retl
nop
instead of:
two:
save -96, %o6, %o6
sethi 0, %l0
or %g0, 1, %l1
or %g0, 20, %l2
or %g0, 10, %l3
subcc %i0, 0, %l4
be .LBBtwo_2 ! entry
nop
.LBBtwo_1: ! entry
or %g0, %l0, %l1
.LBBtwo_2: ! entry
subcc %l1, 0, %l0
bne .LBBtwo_4 ! entry
nop
.LBBtwo_3: ! entry
or %g0, %l2, %l3
.LBBtwo_4: ! entry
st %l3, [%i1]
restore %g0, %g0, %g0
retl
nop
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25806 91177308-0d34-0410-b5e6-96231b3b80d8
Meta TODO list: 1. Create a new DAG -> DAG instruction selector, by adding patterns to the instructions. 2. ??? 3. profit! To-do ----- * Keep the address of the constant pool in a register instead of forming its address all of the time. * We can fold small constant offsets into the %hi/%lo references to constant pool addresses as well.