399 lines
13 KiB
LLVM
399 lines
13 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; https://bugs.llvm.org/show_bug.cgi?id=37603
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; Pattern:
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; x << y >> y
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; Should be transformed into:
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; x & (-1 >> y)
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; ============================================================================ ;
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; Basic positive tests
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; ============================================================================ ;
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define i32 @positive_samevar(i32 %x, i32 %y) {
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; CHECK-LABEL: @positive_samevar(
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; CHECK-NEXT: [[TMP1:%.*]] = lshr i32 -1, [[Y:%.*]]
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; CHECK-NEXT: [[RET:%.*]] = and i32 [[TMP1]], [[X:%.*]]
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; CHECK-NEXT: ret i32 [[RET]]
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;
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%tmp0 = shl i32 %x, %y
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%ret = lshr i32 %tmp0, %y
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ret i32 %ret
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}
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define i32 @positive_sameconst(i32 %x) {
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; CHECK-LABEL: @positive_sameconst(
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; CHECK-NEXT: [[TMP0:%.*]] = and i32 [[X:%.*]], 134217727
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; CHECK-NEXT: ret i32 [[TMP0]]
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;
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%tmp0 = shl i32 %x, 5
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%ret = lshr i32 %tmp0, 5
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ret i32 %ret
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}
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define i32 @positive_biggerShl(i32 %x) {
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; CHECK-LABEL: @positive_biggerShl(
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; CHECK-NEXT: [[TMP1:%.*]] = shl i32 [[X:%.*]], 5
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; CHECK-NEXT: [[RET:%.*]] = and i32 [[TMP1]], 134217696
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; CHECK-NEXT: ret i32 [[RET]]
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;
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%tmp0 = shl i32 %x, 10
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%ret = lshr i32 %tmp0, 5
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ret i32 %ret
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}
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define i32 @positive_biggerLshr(i32 %x) {
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; CHECK-LABEL: @positive_biggerLshr(
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; CHECK-NEXT: [[TMP1:%.*]] = lshr i32 [[X:%.*]], 5
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; CHECK-NEXT: [[RET:%.*]] = and i32 [[TMP1]], 4194303
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; CHECK-NEXT: ret i32 [[RET]]
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;
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%tmp0 = shl i32 %x, 5
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%ret = lshr i32 %tmp0, 10
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ret i32 %ret
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}
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define i32 @positive_biggerLshr_lshrexact(i32 %x) {
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; CHECK-LABEL: @positive_biggerLshr_lshrexact(
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; CHECK-NEXT: [[TMP1:%.*]] = lshr exact i32 [[X:%.*]], 5
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; CHECK-NEXT: [[RET:%.*]] = and i32 [[TMP1]], 4194303
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; CHECK-NEXT: ret i32 [[RET]]
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;
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%tmp0 = shl i32 %x, 5
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%ret = lshr exact i32 %tmp0, 10
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ret i32 %ret
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}
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; ============================================================================ ;
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; NUW on the first shift
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; ============================================================================ ;
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define i32 @positive_samevar_shlnuw(i32 %x, i32 %y) {
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; CHECK-LABEL: @positive_samevar_shlnuw(
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; CHECK-NEXT: ret i32 [[X:%.*]]
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;
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%tmp0 = shl nuw i32 %x, %y
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%ret = lshr i32 %tmp0, %y ; this one is obviously 'exact'.
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ret i32 %ret
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}
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define i32 @positive_sameconst_shlnuw(i32 %x) {
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; CHECK-LABEL: @positive_sameconst_shlnuw(
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; CHECK-NEXT: ret i32 [[X:%.*]]
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;
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%tmp0 = shl nuw i32 %x, 5
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%ret = lshr i32 %tmp0, 5 ; this one is obviously 'exact'.
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ret i32 %ret
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}
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define i32 @positive_biggerShl_shlnuw(i32 %x) {
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; CHECK-LABEL: @positive_biggerShl_shlnuw(
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; CHECK-NEXT: [[RET:%.*]] = shl nuw i32 [[X:%.*]], 5
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; CHECK-NEXT: ret i32 [[RET]]
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;
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%tmp0 = shl nuw i32 %x, 10
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%ret = lshr i32 %tmp0, 5 ; this one is obviously 'exact'.
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ret i32 %ret
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}
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define i32 @positive_biggerLshr_shlnuw(i32 %x) {
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; CHECK-LABEL: @positive_biggerLshr_shlnuw(
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; CHECK-NEXT: [[RET:%.*]] = lshr i32 [[X:%.*]], 5
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; CHECK-NEXT: ret i32 [[RET]]
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;
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%tmp0 = shl nuw i32 %x, 5
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%ret = lshr i32 %tmp0, 10
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ret i32 %ret
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}
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define i32 @positive_biggerLshr_shlnuw_lshrexact(i32 %x) {
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; CHECK-LABEL: @positive_biggerLshr_shlnuw_lshrexact(
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; CHECK-NEXT: [[RET:%.*]] = lshr exact i32 [[X:%.*]], 5
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; CHECK-NEXT: ret i32 [[RET]]
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;
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%tmp0 = shl nuw i32 %x, 5
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%ret = lshr exact i32 %tmp0, 10
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ret i32 %ret
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}
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; ============================================================================ ;
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; Vector
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; ============================================================================ ;
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define <2 x i32> @positive_samevar_vec(<2 x i32> %x, <2 x i32> %y) {
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; CHECK-LABEL: @positive_samevar_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = lshr <2 x i32> <i32 -1, i32 -1>, [[Y:%.*]]
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; CHECK-NEXT: [[RET:%.*]] = and <2 x i32> [[TMP1]], [[X:%.*]]
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; CHECK-NEXT: ret <2 x i32> [[RET]]
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;
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%tmp0 = shl <2 x i32> %x, %y
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%ret = lshr <2 x i32> %tmp0, %y
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ret <2 x i32> %ret
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}
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; ============================================================================ ;
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; Constant Vectors
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; ============================================================================ ;
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define <2 x i32> @positive_sameconst_vec(<2 x i32> %x) {
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; CHECK-LABEL: @positive_sameconst_vec(
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; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i32> [[X:%.*]], <i32 134217727, i32 134217727>
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; CHECK-NEXT: ret <2 x i32> [[TMP0]]
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;
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%tmp0 = shl <2 x i32> %x, <i32 5, i32 5>
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%ret = lshr <2 x i32> %tmp0, <i32 5, i32 5>
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ret <2 x i32> %ret
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}
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define <3 x i32> @positive_sameconst_vec_undef0(<3 x i32> %x) {
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; CHECK-LABEL: @positive_sameconst_vec_undef0(
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; CHECK-NEXT: [[TMP0:%.*]] = shl <3 x i32> [[X:%.*]], <i32 5, i32 undef, i32 5>
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; CHECK-NEXT: [[RET:%.*]] = lshr <3 x i32> [[TMP0]], <i32 5, i32 5, i32 5>
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; CHECK-NEXT: ret <3 x i32> [[RET]]
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;
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%tmp0 = shl <3 x i32> %x, <i32 5, i32 undef, i32 5>
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%ret = lshr <3 x i32> %tmp0, <i32 5, i32 5, i32 5>
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ret <3 x i32> %ret
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}
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define <3 x i32> @positive_sameconst_vec_undef1(<3 x i32> %x) {
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; CHECK-LABEL: @positive_sameconst_vec_undef1(
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; CHECK-NEXT: [[TMP0:%.*]] = shl <3 x i32> [[X:%.*]], <i32 5, i32 5, i32 5>
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; CHECK-NEXT: [[RET:%.*]] = lshr <3 x i32> [[TMP0]], <i32 5, i32 undef, i32 5>
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; CHECK-NEXT: ret <3 x i32> [[RET]]
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;
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%tmp0 = shl <3 x i32> %x, <i32 5, i32 5, i32 5>
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%ret = lshr <3 x i32> %tmp0, <i32 5, i32 undef, i32 5>
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ret <3 x i32> %ret
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}
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define <3 x i32> @positive_sameconst_vec_undef2(<3 x i32> %x) {
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; CHECK-LABEL: @positive_sameconst_vec_undef2(
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; CHECK-NEXT: [[RET:%.*]] = and <3 x i32> [[X:%.*]], <i32 134217727, i32 undef, i32 134217727>
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; CHECK-NEXT: ret <3 x i32> [[RET]]
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;
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%tmp0 = shl <3 x i32> %x, <i32 5, i32 undef, i32 5>
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%ret = lshr <3 x i32> %tmp0, <i32 5, i32 undef, i32 5>
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ret <3 x i32> %ret
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}
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define <2 x i32> @positive_biggerShl_vec(<2 x i32> %x) {
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; CHECK-LABEL: @positive_biggerShl_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = shl <2 x i32> [[X:%.*]], <i32 5, i32 5>
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; CHECK-NEXT: [[RET:%.*]] = and <2 x i32> [[TMP1]], <i32 134217696, i32 134217696>
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; CHECK-NEXT: ret <2 x i32> [[RET]]
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;
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%tmp0 = shl <2 x i32> %x, <i32 10, i32 10>
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%ret = lshr <2 x i32> %tmp0, <i32 5, i32 5>
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ret <2 x i32> %ret
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}
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define <3 x i32> @positive_biggerShl_vec_undef0(<3 x i32> %x) {
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; CHECK-LABEL: @positive_biggerShl_vec_undef0(
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; CHECK-NEXT: [[TMP0:%.*]] = shl <3 x i32> [[X:%.*]], <i32 10, i32 undef, i32 10>
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; CHECK-NEXT: [[RET:%.*]] = lshr <3 x i32> [[TMP0]], <i32 5, i32 5, i32 5>
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; CHECK-NEXT: ret <3 x i32> [[RET]]
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;
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%tmp0 = shl <3 x i32> %x, <i32 10, i32 undef, i32 10>
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%ret = lshr <3 x i32> %tmp0, <i32 5, i32 5, i32 5>
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ret <3 x i32> %ret
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}
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define <3 x i32> @positive_biggerShl_vec_undef1(<3 x i32> %x) {
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; CHECK-LABEL: @positive_biggerShl_vec_undef1(
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; CHECK-NEXT: [[TMP0:%.*]] = shl <3 x i32> [[X:%.*]], <i32 10, i32 10, i32 10>
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; CHECK-NEXT: [[RET:%.*]] = lshr <3 x i32> [[TMP0]], <i32 5, i32 undef, i32 5>
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; CHECK-NEXT: ret <3 x i32> [[RET]]
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;
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%tmp0 = shl <3 x i32> %x, <i32 10, i32 10, i32 10>
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%ret = lshr <3 x i32> %tmp0, <i32 5, i32 undef, i32 5>
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ret <3 x i32> %ret
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}
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define <3 x i32> @positive_biggerShl_vec_undef2(<3 x i32> %x) {
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; CHECK-LABEL: @positive_biggerShl_vec_undef2(
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; CHECK-NEXT: [[TMP0:%.*]] = shl <3 x i32> [[X:%.*]], <i32 10, i32 undef, i32 10>
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; CHECK-NEXT: [[RET:%.*]] = lshr <3 x i32> [[TMP0]], <i32 5, i32 undef, i32 5>
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; CHECK-NEXT: ret <3 x i32> [[RET]]
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;
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%tmp0 = shl <3 x i32> %x, <i32 10, i32 undef, i32 10>
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%ret = lshr <3 x i32> %tmp0, <i32 5, i32 undef, i32 5>
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ret <3 x i32> %ret
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}
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define <2 x i32> @positive_biggerLshr_vec(<2 x i32> %x) {
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; CHECK-LABEL: @positive_biggerLshr_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = lshr <2 x i32> [[X:%.*]], <i32 5, i32 5>
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; CHECK-NEXT: [[RET:%.*]] = and <2 x i32> [[TMP1]], <i32 4194303, i32 4194303>
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; CHECK-NEXT: ret <2 x i32> [[RET]]
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;
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%tmp0 = shl <2 x i32> %x, <i32 5, i32 5>
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%ret = lshr <2 x i32> %tmp0, <i32 10, i32 10>
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ret <2 x i32> %ret
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}
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define <3 x i32> @positive_biggerLshr_vec_undef0(<3 x i32> %x) {
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; CHECK-LABEL: @positive_biggerLshr_vec_undef0(
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; CHECK-NEXT: [[TMP0:%.*]] = shl <3 x i32> [[X:%.*]], <i32 5, i32 undef, i32 5>
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; CHECK-NEXT: [[RET:%.*]] = lshr <3 x i32> [[TMP0]], <i32 10, i32 10, i32 10>
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; CHECK-NEXT: ret <3 x i32> [[RET]]
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;
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%tmp0 = shl <3 x i32> %x, <i32 5, i32 undef, i32 5>
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%ret = lshr <3 x i32> %tmp0, <i32 10, i32 10, i32 10>
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ret <3 x i32> %ret
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}
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define <3 x i32> @positive_biggerLshr_vec_undef1(<3 x i32> %x) {
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; CHECK-LABEL: @positive_biggerLshr_vec_undef1(
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; CHECK-NEXT: [[TMP0:%.*]] = shl <3 x i32> [[X:%.*]], <i32 5, i32 5, i32 5>
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; CHECK-NEXT: [[RET:%.*]] = lshr <3 x i32> [[TMP0]], <i32 10, i32 undef, i32 10>
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; CHECK-NEXT: ret <3 x i32> [[RET]]
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;
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%tmp0 = shl <3 x i32> %x, <i32 5, i32 5, i32 5>
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%ret = lshr <3 x i32> %tmp0, <i32 10, i32 undef, i32 10>
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ret <3 x i32> %ret
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}
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define <3 x i32> @positive_biggerLshr_vec_undef2(<3 x i32> %x) {
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; CHECK-LABEL: @positive_biggerLshr_vec_undef2(
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; CHECK-NEXT: [[TMP0:%.*]] = shl <3 x i32> [[X:%.*]], <i32 5, i32 undef, i32 5>
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; CHECK-NEXT: [[RET:%.*]] = lshr <3 x i32> [[TMP0]], <i32 10, i32 undef, i32 10>
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; CHECK-NEXT: ret <3 x i32> [[RET]]
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;
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%tmp0 = shl <3 x i32> %x, <i32 5, i32 undef, i32 5>
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%ret = lshr <3 x i32> %tmp0, <i32 10, i32 undef, i32 10>
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ret <3 x i32> %ret
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}
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; ============================================================================ ;
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; Positive multi-use tests with constant
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; ============================================================================ ;
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define i32 @positive_sameconst_multiuse(i32 %x) {
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; CHECK-LABEL: @positive_sameconst_multiuse(
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; CHECK-NEXT: [[TMP0:%.*]] = shl i32 [[X:%.*]], 5
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; CHECK-NEXT: call void @use32(i32 [[TMP0]])
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; CHECK-NEXT: [[RET:%.*]] = and i32 [[X]], 134217727
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; CHECK-NEXT: ret i32 [[RET]]
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;
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%tmp0 = shl i32 %x, 5
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call void @use32(i32 %tmp0)
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%ret = lshr i32 %tmp0, 5
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ret i32 %ret
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}
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define i32 @positive_biggerShl_shlnuw_multiuse(i32 %x) {
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; CHECK-LABEL: @positive_biggerShl_shlnuw_multiuse(
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; CHECK-NEXT: [[TMP0:%.*]] = shl nuw i32 [[X:%.*]], 10
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; CHECK-NEXT: call void @use32(i32 [[TMP0]])
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; CHECK-NEXT: [[RET:%.*]] = shl nuw i32 [[X]], 5
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; CHECK-NEXT: ret i32 [[RET]]
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;
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%tmp0 = shl nuw i32 %x, 10
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call void @use32(i32 %tmp0)
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%ret = lshr i32 %tmp0, 5
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||
|
|
ret i32 %ret
|
||
|
|
}
|
||
|
|
|
||
|
|
define i32 @positive_biggerLshr_shlnuw_multiuse(i32 %x) {
|
||
|
|
; CHECK-LABEL: @positive_biggerLshr_shlnuw_multiuse(
|
||
|
|
; CHECK-NEXT: [[TMP0:%.*]] = shl nuw i32 [[X:%.*]], 5
|
||
|
|
; CHECK-NEXT: call void @use32(i32 [[TMP0]])
|
||
|
|
; CHECK-NEXT: [[RET:%.*]] = lshr i32 [[X]], 5
|
||
|
|
; CHECK-NEXT: ret i32 [[RET]]
|
||
|
|
;
|
||
|
|
%tmp0 = shl nuw i32 %x, 5
|
||
|
|
call void @use32(i32 %tmp0)
|
||
|
|
%ret = lshr i32 %tmp0, 10
|
||
|
|
ret i32 %ret
|
||
|
|
}
|
||
|
|
|
||
|
|
; NOTE: creates one extra instruction, but this seems intentional.
|
||
|
|
define i32 @positive_biggerShl_multiuse_extrainstr(i32 %x) {
|
||
|
|
; CHECK-LABEL: @positive_biggerShl_multiuse_extrainstr(
|
||
|
|
; CHECK-NEXT: [[TMP0:%.*]] = shl i32 [[X:%.*]], 10
|
||
|
|
; CHECK-NEXT: call void @use32(i32 [[TMP0]])
|
||
|
|
; CHECK-NEXT: [[TMP1:%.*]] = shl i32 [[X]], 5
|
||
|
|
; CHECK-NEXT: [[RET:%.*]] = and i32 [[TMP1]], 134217696
|
||
|
|
; CHECK-NEXT: ret i32 [[RET]]
|
||
|
|
;
|
||
|
|
%tmp0 = shl i32 %x, 10
|
||
|
|
call void @use32(i32 %tmp0)
|
||
|
|
%ret = lshr i32 %tmp0, 5
|
||
|
|
ret i32 %ret
|
||
|
|
}
|
||
|
|
|
||
|
|
; NOTE: creates one extra instruction, but this seems intentional.
|
||
|
|
define i32 @positive_biggerLshr_multiuse_extrainstr(i32 %x) {
|
||
|
|
; CHECK-LABEL: @positive_biggerLshr_multiuse_extrainstr(
|
||
|
|
; CHECK-NEXT: [[TMP0:%.*]] = shl i32 [[X:%.*]], 5
|
||
|
|
; CHECK-NEXT: call void @use32(i32 [[TMP0]])
|
||
|
|
; CHECK-NEXT: [[TMP1:%.*]] = lshr i32 [[X]], 5
|
||
|
|
; CHECK-NEXT: [[RET:%.*]] = and i32 [[TMP1]], 4194303
|
||
|
|
; CHECK-NEXT: ret i32 [[RET]]
|
||
|
|
;
|
||
|
|
%tmp0 = shl i32 %x, 5
|
||
|
|
call void @use32(i32 %tmp0)
|
||
|
|
%ret = lshr i32 %tmp0, 10
|
||
|
|
ret i32 %ret
|
||
|
|
}
|
||
|
|
|
||
|
|
; ============================================================================ ;
|
||
|
|
; Constant Non-Splat Vectors
|
||
|
|
; ============================================================================ ;
|
||
|
|
|
||
|
|
define <2 x i32> @positive_biggerShl_vec_nonsplat(<2 x i32> %x) {
|
||
|
|
; CHECK-LABEL: @positive_biggerShl_vec_nonsplat(
|
||
|
|
; CHECK-NEXT: [[TMP0:%.*]] = shl <2 x i32> [[X:%.*]], <i32 5, i32 5>
|
||
|
|
; CHECK-NEXT: [[RET:%.*]] = lshr <2 x i32> [[TMP0]], <i32 5, i32 10>
|
||
|
|
; CHECK-NEXT: ret <2 x i32> [[RET]]
|
||
|
|
;
|
||
|
|
%tmp0 = shl <2 x i32> %x, <i32 5, i32 5>
|
||
|
|
%ret = lshr <2 x i32> %tmp0, <i32 5, i32 10>
|
||
|
|
ret <2 x i32> %ret
|
||
|
|
}
|
||
|
|
|
||
|
|
define <2 x i32> @positive_biggerLshl_vec_nonsplat(<2 x i32> %x) {
|
||
|
|
; CHECK-LABEL: @positive_biggerLshl_vec_nonsplat(
|
||
|
|
; CHECK-NEXT: [[TMP0:%.*]] = shl <2 x i32> [[X:%.*]], <i32 5, i32 10>
|
||
|
|
; CHECK-NEXT: [[RET:%.*]] = lshr <2 x i32> [[TMP0]], <i32 5, i32 5>
|
||
|
|
; CHECK-NEXT: ret <2 x i32> [[RET]]
|
||
|
|
;
|
||
|
|
%tmp0 = shl <2 x i32> %x, <i32 5, i32 10>
|
||
|
|
%ret = lshr <2 x i32> %tmp0, <i32 5, i32 5>
|
||
|
|
ret <2 x i32> %ret
|
||
|
|
}
|
||
|
|
|
||
|
|
; ============================================================================ ;
|
||
|
|
; Negative tests. Should not be folded.
|
||
|
|
; ============================================================================ ;
|
||
|
|
|
||
|
|
define i32 @negative_twovars(i32 %x, i32 %y, i32 %z) {
|
||
|
|
; CHECK-LABEL: @negative_twovars(
|
||
|
|
; CHECK-NEXT: [[TMP0:%.*]] = shl i32 [[X:%.*]], [[Y:%.*]]
|
||
|
|
; CHECK-NEXT: [[RET:%.*]] = lshr i32 [[TMP0]], [[Z:%.*]]
|
||
|
|
; CHECK-NEXT: ret i32 [[RET]]
|
||
|
|
;
|
||
|
|
%tmp0 = shl i32 %x, %y
|
||
|
|
%ret = lshr i32 %tmp0, %z ; $z, not %y
|
||
|
|
ret i32 %ret
|
||
|
|
}
|
||
|
|
|
||
|
|
declare void @use32(i32)
|
||
|
|
|
||
|
|
; One use only.
|
||
|
|
define i32 @negative_oneuse(i32 %x, i32 %y) {
|
||
|
|
; CHECK-LABEL: @negative_oneuse(
|
||
|
|
; CHECK-NEXT: [[TMP0:%.*]] = shl i32 [[X:%.*]], [[Y:%.*]]
|
||
|
|
; CHECK-NEXT: call void @use32(i32 [[TMP0]])
|
||
|
|
; CHECK-NEXT: [[RET:%.*]] = lshr i32 [[TMP0]], [[Y]]
|
||
|
|
; CHECK-NEXT: ret i32 [[RET]]
|
||
|
|
;
|
||
|
|
%tmp0 = shl i32 %x, %y
|
||
|
|
call void @use32(i32 %tmp0)
|
||
|
|
%ret = lshr i32 %tmp0, %y
|
||
|
|
ret i32 %ret
|
||
|
|
}
|