From 4f0dfbb454ea8110459e2d1ee5f92e74cb3e8a5c Mon Sep 17 00:00:00 2001 From: Duncan Sands Date: Fri, 16 Nov 2012 20:53:08 +0000 Subject: Make this easier to understand, as suggested by Chandler. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168196 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/InstCombine/InstCombineCompares.cpp | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'lib/Transforms') diff --git a/lib/Transforms/InstCombine/InstCombineCompares.cpp b/lib/Transforms/InstCombine/InstCombineCompares.cpp index e223a049f0..7c3f8fe15d 100644 --- a/lib/Transforms/InstCombine/InstCombineCompares.cpp +++ b/lib/Transforms/InstCombine/InstCombineCompares.cpp @@ -2358,15 +2358,20 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) { // Determine Y and Z in the form icmp (X+Y), (X+Z). Value *Y, *Z; if (A == C) { + // C + B == C + D -> B == D Y = B; Z = D; } else if (A == D) { + // D + B == C + D -> B == C Y = B; Z = C; } else if (B == C) { + // A + C == C + D -> A == D Y = A; Z = D; - } else if (B == D) { + } else { + assert(B == D); + // A + D == C + D -> A == C Y = A; Z = C; } -- cgit v1.2.3