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Make this easier to understand, as suggested by Chandler.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168196 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
2012-11-16 20:53:08 +00:00
parent 2217577fa7
commit 4f0dfbb454
2 changed files with 12 additions and 2 deletions
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7
lib/Analysis/InstructionSimplify.cpp
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@@ -2067,15 +2067,20 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
// Determine Y and Z in the form icmp (X+Y), (X+Z). // Determine Y and Z in the form icmp (X+Y), (X+Z).
Value *Y, *Z; Value *Y, *Z;
if (A == C) { if (A == C) {
// C + B == C + D -> B == D
Y = B; Y = B;
Z = D; Z = D;
} else if (A == D) { } else if (A == D) {
// D + B == C + D -> B == C
Y = B; Y = B;
Z = C; Z = C;
} else if (B == C) { } else if (B == C) {
// A + C == C + D -> A == D
Y = A; Y = A;
Z = D; Z = D;
} else if (B == D) { } else {
assert(B == D);
// A + D == C + D -> A == C
Y = A; Y = A;
Z = C; Z = C;
} }

7
lib/Transforms/InstCombine/InstCombineCompares.cpp
View File

@@ -2358,15 +2358,20 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) {
// Determine Y and Z in the form icmp (X+Y), (X+Z). // Determine Y and Z in the form icmp (X+Y), (X+Z).
Value *Y, *Z; Value *Y, *Z;
if (A == C) { if (A == C) {
// C + B == C + D -> B == D
Y = B; Y = B;
Z = D; Z = D;
} else if (A == D) { } else if (A == D) {
// D + B == C + D -> B == C
Y = B; Y = B;
Z = C; Z = C;
} else if (B == C) { } else if (B == C) {
// A + C == C + D -> A == D
Y = A; Y = A;
Z = D; Z = D;
} else if (B == D) { } else {
assert(B == D);
// A + D == C + D -> A == C
Y = A; Y = A;
Z = C; Z = C;
} }