Revert "[BypassSlowDivision] Improve our handling of divisions by constants"

This reverts commit r314253.  It causes a miscompile on P100 in an internal
benchmark.  Reverting while I investigate.

llvm-svn: 314482

1 files changed, 0 insertions, 77 deletions

diff --git a/llvm/test/Transforms/CodeGenPrepare/NVPTX/bypass-slow-div.ll b/llvm/test/Transforms/CodeGenPrepare/NVPTX/bypass-slow-div.ll
index 4d824e450ff..4846d52f4d2 100644
--- a/llvm/test/Transforms/CodeGenPrepare/NVPTX/bypass-slow-div.ll
+++ b/llvm/test/Transforms/CodeGenPrepare/NVPTX/bypass-slow-div.ll
@@ -27,80 +27,3 @@ define void @rem_only(i64 %a, i64 %b, i64* %retptr) {
   store i64 %d, i64* %retptr
   ret void
 }
-
-; CHECK-LABEL: @udiv_by_constant(
-define i64 @udiv_by_constant(i32 %a) {
-; CHECK-NEXT:    [[A_ZEXT:%.*]] = zext i32 [[A:%.*]] to i64
-; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[A_ZEXT]] to i32
-; CHECK-NEXT:    [[TMP2:%.*]] = udiv i32 [[TMP1]], 50
-; CHECK-NEXT:    [[TMP3:%.*]] = zext i32 [[TMP2]] to i64
-; CHECK-NEXT:    ret i64 [[TMP3]]
-
-  %a.zext = zext i32 %a to i64
-  %wide.div = udiv i64 %a.zext, 50
-  ret i64 %wide.div
-}
-
-; CHECK-LABEL: @urem_by_constant(
-define i64 @urem_by_constant(i32 %a) {
-; CHECK-NEXT:    [[A_ZEXT:%.*]] = zext i32 [[A:%.*]] to i64
-; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[A_ZEXT]] to i32
-; CHECK-NEXT:    [[TMP2:%.*]] = urem i32 [[TMP1]], 50
-; CHECK-NEXT:    [[TMP3:%.*]] = zext i32 [[TMP2]] to i64
-; CHECK-NEXT:    ret i64 [[TMP3]]
-
-  %a.zext = zext i32 %a to i64
-  %wide.div = urem i64 %a.zext, 50
-  ret i64 %wide.div
-}
-
-; Negative test: instead of emitting a runtime check on %a, we prefer to let the
-; DAGCombiner transform this division by constant into a multiplication (with a
-; "magic constant").
-;
-; CHECK-LABEL: @udiv_by_constant_negative_0(
-define i64 @udiv_by_constant_negative_0(i64 %a) {
-; CHECK-NEXT:    [[WIDE_DIV:%.*]] = udiv i64 [[A:%.*]], 50
-; CHECK-NEXT:    ret i64 [[WIDE_DIV]]
-
-  %wide.div = udiv i64 %a, 50
-  ret i64 %wide.div
-}
-
-; Negative test: while we know the dividend is short, the divisor isn't.  This
-; test is here for completeness, but instcombine will optimize this to return 0.
-;
-; CHECK-LABEL: @udiv_by_constant_negative_1(
-define i64 @udiv_by_constant_negative_1(i32 %a) {
-; CHECK-NEXT:    [[A_ZEXT:%.*]] = zext i32 [[A:%.*]] to i64
-; CHECK-NEXT:    [[WIDE_DIV:%.*]] = udiv i64 [[A_ZEXT]], 8589934592
-; CHECK-NEXT:    ret i64 [[WIDE_DIV]]
-
-  %a.zext = zext i32 %a to i64
-  %wide.div = udiv i64 %a.zext, 8589934592 ;; == 1 << 33
-  ret i64 %wide.div
-}
-
-; URem version of udiv_by_constant_negative_0
-;
-; CHECK-LABEL: @urem_by_constant_negative_0(
-define i64 @urem_by_constant_negative_0(i64 %a) {
-; CHECK-NEXT:    [[WIDE_DIV:%.*]] = urem i64 [[A:%.*]], 50
-; CHECK-NEXT:    ret i64 [[WIDE_DIV]]
-
-  %wide.div = urem i64 %a, 50
-  ret i64 %wide.div
-}
-
-; URem version of udiv_by_constant_negative_1
-;
-; CHECK-LABEL: @urem_by_constant_negative_1(
-define i64 @urem_by_constant_negative_1(i32 %a) {
-; CHECK-NEXT:    [[A_ZEXT:%.*]] = zext i32 [[A:%.*]] to i64
-; CHECK-NEXT:    [[WIDE_DIV:%.*]] = urem i64 [[A_ZEXT]], 8589934592
-; CHECK-NEXT:    ret i64 [[WIDE_DIV]]
-
-  %a.zext = zext i32 %a to i64
-  %wide.div = urem i64 %a.zext, 8589934592 ;; == 1 << 33
-  ret i64 %wide.div
-}