6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-08-25 00:29:20 +00:00
Code Issues Projects Releases Wiki Activity

Add extra CHECK to make sure that 'or' instruction was replaced.

Browse Source 
Also add an assert to avoid confusion in the code where is known that C1 <= C2.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171310 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakub Staszak 2012-12-31 18:26:42 +00:00
parent 5b712efd9a
commit 526057921d
2 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
View File

@ -1528,6 +1528,8 @@ Value *InstCombiner::FoldOrOfICmps(ICmpInst *LHS, ICmpInst *RHS) {
if (LHS->getOperand(0) == RHS->getOperand(0)) {
// if LHSCst and RHSCst differ only by one bit:
// (A == C1 || A == C2) -> (A & ~(C1 ^ C2)) == C1
assert(LHSCst->getValue().ule(LHSCst->getValue()));
APInt Xor = LHSCst->getValue() ^ RHSCst->getValue();
if (Xor.isPowerOf2()) {
Value *NegCst = Builder->getInt(~Xor);

1
test/Transforms/InstCombine/icmp.ll
View File

@ -699,6 +699,7 @@ define i1 @test68(i32 %x) nounwind uwtable {
; CHECK: @test69
; CHECK: %1 = and i32 %c, -33
; CHECK: %2 = icmp eq i32 %1, 65
; CHECK: ret i1 %2
define i1 @test69(i32 %c) nounwind uwtable {
%1 = icmp eq i32 %c, 97
%2 = icmp eq i32 %c, 65