Generalize the reassociation transform in SimplifyCommutative (now renamed to

SimplifyAssociativeOrCommutative) "(A op C1) op C2" -> "A op (C1 op C2)",
which previously was only done if C1 and C2 were constants, to occur whenever
"C1 op C2" simplifies (a la InstructionSimplify).  Since the simplifying operand
combination can no longer be assumed to be the right-hand terms, consider all of
the possible permutations.  When compiling "gcc as one big file", transform 2
(i.e. using right-hand operands) fires about 4000 times but it has to be said
that most of the time the simplifying operands are both constants.  Transforms
3, 4 and 5 each fired once.  Transform 6, which is an existing transform that
I didn't change, never fired.  With this change, the testcase is now optimized
perfectly with one run of instcombine (previously it required instcombine +
reassociate + instcombine, and it may just have been luck that this worked).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119002 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 0 deletions

diff --git a/test/Transforms/InstCombine/select.ll b/test/Transforms/InstCombine/select.ll
index 62f0eda083..c1c1f08383 100644
--- a/test/Transforms/InstCombine/select.ll
+++ b/test/Transforms/InstCombine/select.ll
@@ -546,3 +546,13 @@ ret:
 ; CHECK: @test43
 ; CHECK: ret i1 false
 }
+
+define i32 @test44(i1 %cond, i32 %x, i32 %y) {
+  %z = and i32 %x, %y
+  %s = select i1 %cond, i32 %y, i32 %z
+  %r = and i32 %x, %s
+  ret i32 %r
+; CHECK: @test44
+; CHECK: %r = and i32 %x, %y
+; CHECK: ret i32 %r
+}