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When determining whether the new instruction was already present in

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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
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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