%div = sdiv exact <2 x i8> %x, <i8 -32, i8 undef>
ret <2 x i8> %div
}
+
+define i8 @prove_exact_with_high_mask(i8 %x, i8 %y) {
+; CHECK-LABEL: @prove_exact_with_high_mask(
+; CHECK-NEXT: [[A:%.*]] = and i8 [[X:%.*]], -32
+; CHECK-NEXT: [[D:%.*]] = sdiv i8 [[A]], -4
+; CHECK-NEXT: ret i8 [[D]]
+;
+ %a = and i8 %x, -32
+ %d = sdiv i8 %a, -4
+ ret i8 %d
+}
+
+define i8 @prove_exact_with_high_mask_limit(i8 %x, i8 %y) {
+; CHECK-LABEL: @prove_exact_with_high_mask_limit(
+; CHECK-NEXT: [[A:%.*]] = and i8 [[X:%.*]], -32
+; CHECK-NEXT: [[D:%.*]] = sdiv i8 [[A]], -32
+; CHECK-NEXT: ret i8 [[D]]
+;
+ %a = and i8 %x, -32
+ %d = sdiv i8 %a, -32
+ ret i8 %d
+}
+
+define i8 @not_prove_exact_with_high_mask(i8 %x, i8 %y) {
+; CHECK-LABEL: @not_prove_exact_with_high_mask(
+; CHECK-NEXT: [[A:%.*]] = and i8 [[X:%.*]], -32
+; CHECK-NEXT: [[D:%.*]] = sdiv i8 [[A]], -64
+; CHECK-NEXT: ret i8 [[D]]
+;
+ %a = and i8 %x, -32
+ %d = sdiv i8 %a, -64
+ ret i8 %d
+}
+
+define <2 x i8> @prove_exact_with_high_mask_splat_vec(<2 x i8> %x, <2 x i8> %y) {
+; CHECK-LABEL: @prove_exact_with_high_mask_splat_vec(
+; CHECK-NEXT: [[A:%.*]] = shl <2 x i8> [[X:%.*]], <i8 5, i8 5>
+; CHECK-NEXT: [[D:%.*]] = sdiv <2 x i8> [[A]], <i8 -16, i8 -16>
+; CHECK-NEXT: ret <2 x i8> [[D]]
+;
+ %a = shl <2 x i8> %x, <i8 5, i8 5>
+ %d = sdiv <2 x i8> %a, <i8 -16, i8 -16>
+ ret <2 x i8> %d
+}
+
+define <2 x i8> @prove_exact_with_high_mask_vec(<2 x i8> %x, <2 x i8> %y) {
+; CHECK-LABEL: @prove_exact_with_high_mask_vec(
+; CHECK-NEXT: [[A:%.*]] = shl <2 x i8> [[X:%.*]], <i8 3, i8 2>
+; CHECK-NEXT: [[D:%.*]] = sdiv <2 x i8> [[A]], <i8 -8, i8 -4>
+; CHECK-NEXT: ret <2 x i8> [[D]]
+;
+ %a = shl <2 x i8> %x, <i8 3, i8 2>
+ %d = sdiv <2 x i8> %a, <i8 -8, i8 -4>
+ ret <2 x i8> %d
+}
%div = sdiv i8 %x, %shl
ret i8 %div
}
+
+define i8 @prove_exact_with_high_mask(i8 %x, i8 %y) {
+; CHECK-LABEL: @prove_exact_with_high_mask(
+; CHECK-NEXT: [[A:%.*]] = and i8 [[X:%.*]], -8
+; CHECK-NEXT: [[D:%.*]] = sdiv i8 [[A]], 4
+; CHECK-NEXT: ret i8 [[D]]
+;
+ %a = and i8 %x, -8
+ %d = sdiv i8 %a, 4
+ ret i8 %d
+}
+
+define i8 @prove_exact_with_high_mask_limit(i8 %x, i8 %y) {
+; CHECK-LABEL: @prove_exact_with_high_mask_limit(
+; CHECK-NEXT: [[A:%.*]] = and i8 [[X:%.*]], -8
+; CHECK-NEXT: [[D:%.*]] = sdiv i8 [[A]], 8
+; CHECK-NEXT: ret i8 [[D]]
+;
+ %a = and i8 %x, -8
+ %d = sdiv i8 %a, 8
+ ret i8 %d
+}
+
+define i8 @not_prove_exact_with_high_mask(i8 %x, i8 %y) {
+; CHECK-LABEL: @not_prove_exact_with_high_mask(
+; CHECK-NEXT: [[A:%.*]] = and i8 [[X:%.*]], -8
+; CHECK-NEXT: [[D:%.*]] = sdiv i8 [[A]], 16
+; CHECK-NEXT: ret i8 [[D]]
+;
+ %a = and i8 %x, -8
+ %d = sdiv i8 %a, 16
+ ret i8 %d
+}
+
+define <2 x i8> @prove_exact_with_high_mask_splat_vec(<2 x i8> %x, <2 x i8> %y) {
+; CHECK-LABEL: @prove_exact_with_high_mask_splat_vec(
+; CHECK-NEXT: [[A:%.*]] = shl <2 x i8> [[X:%.*]], <i8 3, i8 3>
+; CHECK-NEXT: [[D:%.*]] = sdiv <2 x i8> [[A]], <i8 8, i8 8>
+; CHECK-NEXT: ret <2 x i8> [[D]]
+;
+ %a = shl <2 x i8> %x, <i8 3, i8 3>
+ %d = sdiv <2 x i8> %a, <i8 8, i8 8>
+ ret <2 x i8> %d
+}
+
+define <2 x i8> @prove_exact_with_high_mask_vec(<2 x i8> %x, <2 x i8> %y) {
+; CHECK-LABEL: @prove_exact_with_high_mask_vec(
+; CHECK-NEXT: [[A:%.*]] = shl <2 x i8> [[X:%.*]], <i8 3, i8 2>
+; CHECK-NEXT: [[D:%.*]] = sdiv <2 x i8> [[A]], <i8 8, i8 4>
+; CHECK-NEXT: ret <2 x i8> [[D]]
+;
+ %a = shl <2 x i8> %x, <i8 3, i8 2>
+ %d = sdiv <2 x i8> %a, <i8 8, i8 4>
+ ret <2 x i8> %d
+}