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Author SHA1 Message Date
Hongbin Zheng d1b7b2efba [SimplifyIndVar] Constant fold IV users 
This patch tries to transform cases like:

for (unsigned i = 0; i < N; i += 2) {
  bool c0 = (i & 0x1) == 0;
  bool c1 = ((i + 1) & 0x1) == 1;
}
To

for (unsigned i = 0; i < N; i += 2) {
  bool c0 = true;
  bool c1 = true;
}

This commit also update test/Transforms/IndVarSimplify/replace-srem-by-urem.ll to prevent constant folding.

Differential Revision: https://reviews.llvm.org/D38272

llvm-svn: 314266
 2017-09-27 03:11:46 +00:00
Hongbin Zheng f0093e45c4 [SimplifyIndvar] Replace the srem used by IV if we can prove both of its operands are non-negative 
Since now SCEV can handle 'urem', an 'urem' is a better canonical form than an 'srem' because it has well-defined behavior

This is a follow up of D34598

Differential Revision: https://reviews.llvm.org/D38072

llvm-svn: 314125
 2017-09-25 17:39:40 +00:00