6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-01 15:11:24 +00:00
Code Issues Projects Releases Wiki Activity

When determining whether the new instruction was already present in

Browse Source 
the original instruction, half the cases were missed (making it not
wrong but suboptimal).  Also correct a typo (A <-> B) in the second
chunk. 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122414 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands 2010-12-22 17:15:25 +00:00
parent b3898af89f
commit 1cd05bb605
2 changed files with 19 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
lib/Analysis/InstructionSimplify.cpp
View File

@ -159,10 +159,11 @@ static Value *FactorizeBinOp(unsigned Opcode, Value *LHS, Value *RHS,
// Does "B op DD" simplify?
if (Value *V = SimplifyBinOp(Opcode, B, DD, TD, DT, MaxRecurse)) {
// It does! Return "A op' V" if it simplifies or is already available.
// If V equals B then "A op' V" is just the LHS.
if (V == B) {
// If V equals B then "A op' V" is just the LHS. If V equals DD then
// "A op' V" is just the RHS.
if (V == B || V == DD) {
++NumFactor;
return LHS;
return V == B ? LHS : RHS;
}
// Otherwise return "A op' V" if it simplifies.
if (Value *W = SimplifyBinOp(OpcodeToExtract, A, V, TD, DT, MaxRecurse)) {
@ -181,10 +182,11 @@ static Value *FactorizeBinOp(unsigned Opcode, Value *LHS, Value *RHS,
// Does "A op CC" simplify?
if (Value *V = SimplifyBinOp(Opcode, A, CC, TD, DT, MaxRecurse)) {
// It does! Return "V op' B" if it simplifies or is already available.
// If V equals A then "V op' B" is just the LHS.
if (V == B) {
// If V equals A then "V op' B" is just the LHS. If V equals CC then
// "V op' B" is just the RHS.
if (V == A || V == CC) {
++NumFactor;
return LHS;
return V == A ? LHS : RHS;
}
// Otherwise return "V op' B" if it simplifies.
if (Value *W = SimplifyBinOp(OpcodeToExtract, V, B, TD, DT, MaxRecurse)) {

11
test/Transforms/InstSimplify/2010-12-20-Distribute.ll
View File

@ -20,6 +20,17 @@ define i32 @factorize2(i32 %x) {
; CHECK: ret i32 %x
}
define i32 @factorize3(i32 %x, i32 %a, i32 %b) {
; CHECK: @factorize3
; (X | (A|B)) & (X | B) -> X | ((A|B) & B) -> X | B
%aORb = or i32 %a, %b
%l = or i32 %x, %aORb
%r = or i32 %x, %b
%z = and i32 %l, %r
ret i32 %z
; CHECK: ret i32 %r
}
define i32 @expand(i32 %x) {
; CHECK: @expand
; ((X & 1) | 2) & 1 -> ((X & 1) & 1) | (2 & 1) -> (X & 1) | 0 -> X & 1