Revert "Added inst combine transforms for single bit tests from Chris's note"

This reverts commit r210006, it miscompiled libapr which is used in who
knows how many projects.

A test has been added to ensure that we don't regress again.

I'll work on a rewrite of what the optimization was trying to do later.

llvm-svn: 222856

1 files changed, 10 insertions, 105 deletions

diff --git a/llvm/test/Transforms/InstCombine/select.ll b/llvm/test/Transforms/InstCombine/select.ll
index c8ae024c293..8444677d19a 100644
--- a/llvm/test/Transforms/InstCombine/select.ll
+++ b/llvm/test/Transforms/InstCombine/select.ll
@@ -997,111 +997,6 @@ define <2 x i32> @select_icmp_eq_and_1_0_or_vector_of_2s(i32 %x, <2 x i32> %y) {
   ret <2 x i32> %select
 }
 
-; CHECK-LABEL: @select_icmp_and_8_eq_0_or_8(
-; CHECK-NEXT: [[OR:%[a-z0-9]+]] = or i32 %x, 8
-; CHECK-NEXT: ret i32 [[OR]]
-define i32 @select_icmp_and_8_eq_0_or_8(i32 %x) {
-  %and = and i32 %x, 8
-  %cmp = icmp eq i32 %and, 0
-  %or = or i32 %x, 8
-  %or.x = select i1 %cmp, i32 %or, i32 %x
-  ret i32 %or.x
-}
-
-; CHECK-LABEL: @select_icmp_and_8_ne_0_xor_8(
-; CHECK-NEXT: [[AND:%[a-z0-9]+]] = and i32 %x, -9
-; CHECK-NEXT: ret i32 [[AND]]
-define i32 @select_icmp_and_8_ne_0_xor_8(i32 %x) {
-  %and = and i32 %x, 8
-  %cmp = icmp eq i32 %and, 0
-  %xor = xor i32 %x, 8
-  %x.xor = select i1 %cmp, i32 %x, i32 %xor
-  ret i32 %x.xor
-}
-
-; CHECK-LABEL: @select_icmp_and_8_eq_0_xor_8(
-; CHECK-NEXT: [[OR:%[a-z0-9]+]] = or i32 %x, 8
-; CHECK-NEXT: ret i32 [[OR]]
-define i32 @select_icmp_and_8_eq_0_xor_8(i32 %x) {
-  %and = and i32 %x, 8
-  %cmp = icmp eq i32 %and, 0
-  %xor = xor i32 %x, 8
-  %xor.x = select i1 %cmp, i32 %xor, i32 %x
-  ret i32 %xor.x
-}
-
-; CHECK-LABEL: @select_icmp_and_8_ne_0_and_not_8(
-; CHECK-NEXT: [[AND:%[a-z0-9]+]] = and i32 %x, -9
-; CHECK-NEXT: ret i32 [[AND]]
-define i32 @select_icmp_and_8_ne_0_and_not_8(i32 %x) {
-  %and = and i32 %x, 8
-  %cmp = icmp eq i32 %and, 0
-  %and1 = and i32 %x, -9
-  %x.and1 = select i1 %cmp, i32 %x, i32 %and1
-  ret i32 %x.and1
-}
-
-; CHECK-LABEL: @select_icmp_and_8_eq_0_and_not_8(
-; CHECK-NEXT: ret i32 %x
-define i32 @select_icmp_and_8_eq_0_and_not_8(i32 %x) {
-  %and = and i32 %x, 8
-  %cmp = icmp eq i32 %and, 0
-  %and1 = and i32 %x, -9
-  %and1.x = select i1 %cmp, i32 %and1, i32 %x
-  ret i32 %and1.x
-}
-
-; CHECK-LABEL: @select_icmp_x_and_8_eq_0_y_xor_8(
-; CHECK: select i1 %cmp, i64 %y, i64 %xor
-define i64 @select_icmp_x_and_8_eq_0_y_xor_8(i32 %x, i64 %y) {
-  %and = and i32 %x, 8
-  %cmp = icmp eq i32 %and, 0
-  %xor = xor i64 %y, 8
-  %y.xor = select i1 %cmp, i64 %y, i64 %xor
-  ret i64 %y.xor
-}
-
-; CHECK-LABEL: @select_icmp_x_and_8_eq_0_y_and_not_8(
-; CHECK: select i1 %cmp, i64 %y, i64 %and1
-define i64 @select_icmp_x_and_8_eq_0_y_and_not_8(i32 %x, i64 %y) {
-  %and = and i32 %x, 8
-  %cmp = icmp eq i32 %and, 0
-  %and1 = and i64 %y, -9
-  %y.and1 = select i1 %cmp, i64 %y, i64 %and1
-  ret i64 %y.and1
-}
-
-; CHECK-LABEL: @select_icmp_x_and_8_ne_0_y_xor_8(
-; CHECK: select i1 %cmp, i64 %xor, i64 %y
-define i64 @select_icmp_x_and_8_ne_0_y_xor_8(i32 %x, i64 %y) {
-  %and = and i32 %x, 8
-  %cmp = icmp eq i32 %and, 0
-  %xor = xor i64 %y, 8
-  %xor.y = select i1 %cmp, i64 %xor, i64 %y
-  ret i64 %xor.y
-}
-
-; CHECK-LABEL: @select_icmp_x_and_8_ne_0_y_and_not_8(
-; CHECK: select i1 %cmp, i64 %and1, i64 %y
-define i64 @select_icmp_x_and_8_ne_0_y_and_not_8(i32 %x, i64 %y) {
-  %and = and i32 %x, 8
-  %cmp = icmp eq i32 %and, 0
-  %and1 = and i64 %y, -9
-  %and1.y = select i1 %cmp, i64 %and1, i64 %y
-  ret i64 %and1.y
-}
-
-; CHECK-LABEL: @select_icmp_x_and_8_ne_0_y_or_8(
-; CHECK: xor i64 %1, 8
-; CHECK: or i64 %2, %y
-define i64 @select_icmp_x_and_8_ne_0_y_or_8(i32 %x, i64 %y) {
-  %and = and i32 %x, 8
-  %cmp = icmp eq i32 %and, 0
-  %or = or i64 %y, 8
-  %or.y = select i1 %cmp, i64 %or, i64 %y
-  ret i64 %or.y
-}
-
 define i32 @test65(i64 %x) {
   %1 = and i64 %x, 16
   %2 = icmp ne i64 %1, 0
@@ -1491,3 +1386,13 @@ entry:
   %v = load i128* %p
   ret i128 %v
 }
+
+define i32 @test87(i32 %x) {
+  %and = and i32 %x, 1
+  %cmp = icmp ne i32 %and, 0
+  %and1 = and i32 %x, -2
+  %and1.x = select i1 %cmp, i32 %and1, i32 %x
+  ret i32 %and1.x
+; CHECK-LABEL: @test87(
+; CHECK: and i32 %x, -2
+}