1 files changed, 159 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/apint-add.ll b/llvm/test/Transforms/InstCombine/apint-add.ll
new file mode 100644
index 00000000000..c55fd0419a6
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/apint-add.ll
@@ -0,0 +1,159 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+; Tests for Integer BitWidth <= 64 && BitWidth % 8 != 0.
+
+;; Flip sign bit then add INT_MIN -> nop.
+define i1 @test1(i1 %x) {
+; CHECK-LABEL: @test1(
+; CHECK-NEXT:    ret i1 %x
+;
+  %tmp.2 = xor i1 %x, 1
+  %tmp.4 = add i1 %tmp.2, 1
+  ret i1 %tmp.4
+}
+
+;; Flip sign bit then add INT_MIN -> nop.
+define i47 @test2(i47 %x) {
+; CHECK-LABEL: @test2(
+; CHECK-NEXT:    ret i47 %x
+;
+  %tmp.2 = xor i47 %x, 70368744177664
+  %tmp.4 = add i47 %tmp.2, 70368744177664
+  ret i47 %tmp.4
+}
+
+;; Flip sign bit then add INT_MIN -> nop.
+define i15 @test3(i15 %x) {
+; CHECK-LABEL: @test3(
+; CHECK-NEXT:    ret i15 %x
+;
+  %tmp.2 = xor i15 %x, 16384
+  %tmp.4 = add i15 %tmp.2, 16384
+  ret i15 %tmp.4
+}
+
+; X + signbit --> X ^ signbit
+define <2 x i5> @test3vec(<2 x i5> %x) {
+; CHECK-LABEL: @test3vec(
+; CHECK-NEXT:    [[Y:%.*]] = xor <2 x i5> %x, <i5 -16, i5 -16>
+; CHECK-NEXT:    ret <2 x i5> [[Y]]
+;
+  %y = add <2 x i5> %x, <i5 16, i5 16>
+  ret <2 x i5> %y
+}
+
+;; (x & 0b1111..0) + 1 -> x | 1
+define i49 @test4(i49 %x) {
+; CHECK-LABEL: @test4(
+; CHECK-NEXT:    [[TMP_4:%.*]] = or i49 %x, 1
+; CHECK-NEXT:    ret i49 [[TMP_4]]
+;
+  %tmp.2 = and i49 %x, 562949953421310
+  %tmp.4 = add i49 %tmp.2, 1
+  ret i49 %tmp.4
+}
+
+define i7 @sext(i4 %x) {
+; CHECK-LABEL: @sext(
+; CHECK-NEXT:    [[ADD:%.*]] = sext i4 %x to i7
+; CHECK-NEXT:    ret i7 [[ADD]]
+;
+  %xor = xor i4 %x, -8
+  %zext = zext i4 %xor to i7
+  %add = add nsw i7 %zext, -8
+  ret i7 %add
+}
+
+define <2 x i10> @sext_vec(<2 x i3> %x) {
+; CHECK-LABEL: @sext_vec(
+; CHECK-NEXT:    [[ADD:%.*]] = sext <2 x i3> %x to <2 x i10>
+; CHECK-NEXT:    ret <2 x i10> [[ADD]]
+;
+  %xor = xor <2 x i3> %x, <i3 -4, i3 -4>
+  %zext = zext <2 x i3> %xor to <2 x i10>
+  %add = add nsw <2 x i10> %zext, <i10 -4, i10 -4>
+  ret <2 x i10> %add
+}
+
+; Multiple uses of the operands don't prevent the fold.
+
+define i4 @sext_multiuse(i4 %x) {
+; CHECK-LABEL: @sext_multiuse(
+; CHECK-NEXT:    [[XOR:%.*]] = xor i4 %x, -8
+; CHECK-NEXT:    [[ZEXT:%.*]] = zext i4 [[XOR]] to i7
+; CHECK-NEXT:    [[ADD:%.*]] = sext i4 %x to i7
+; CHECK-NEXT:    [[MUL:%.*]] = sdiv i7 [[ZEXT]], [[ADD]]
+; CHECK-NEXT:    [[TRUNC:%.*]] = trunc i7 [[MUL]] to i4
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv i4 [[TRUNC]], [[XOR]]
+; CHECK-NEXT:    ret i4 [[DIV]]
+;
+  %xor = xor i4 %x, -8
+  %zext = zext i4 %xor to i7
+  %add = add nsw i7 %zext, -8
+  %mul = sdiv i7 %zext, %add
+  %trunc = trunc i7 %mul to i4
+  %div = sdiv i4 %trunc, %xor
+  ret i4 %div
+}
+
+; Tests for Integer BitWidth > 64 && BitWidth <= 1024.
+
+;; Flip sign bit then add INT_MIN -> nop.
+define i111 @test5(i111 %x) {
+; CHECK-LABEL: @test5(
+; CHECK-NEXT:    ret i111 %x
+;
+  %tmp.2 = shl i111 1, 110
+  %tmp.4 = xor i111 %x, %tmp.2
+  %tmp.6 = add i111 %tmp.4, %tmp.2
+  ret i111 %tmp.6
+}
+
+;; Flip sign bit then add INT_MIN -> nop.
+define i65 @test6(i65 %x) {
+; CHECK-LABEL: @test6(
+; CHECK-NEXT:    ret i65 %x
+;
+  %tmp.0 = shl i65 1, 64
+  %tmp.2 = xor i65 %x, %tmp.0
+  %tmp.4 = add i65 %tmp.2, %tmp.0
+  ret i65 %tmp.4
+}
+
+;; Flip sign bit then add INT_MIN -> nop.
+define i1024 @test7(i1024 %x) {
+; CHECK-LABEL: @test7(
+; CHECK-NEXT:    ret i1024 %x
+;
+  %tmp.0 = shl i1024 1, 1023
+  %tmp.2 = xor i1024 %x, %tmp.0
+  %tmp.4 = add i1024 %tmp.2, %tmp.0
+  ret i1024 %tmp.4
+}
+
+;; If we have add(xor(X, 0xF..F80..), 0x80..), it's an xor.
+define i128 @test8(i128 %x) {
+; CHECK-LABEL: @test8(
+; CHECK-NEXT:    [[TMP_4:%.*]] = xor i128 %x, 170141183460469231731687303715884105600
+; CHECK-NEXT:    ret i128 [[TMP_4]]
+;
+  %tmp.5 = shl i128 1, 127
+  %tmp.1 = ashr i128 %tmp.5, 120
+  %tmp.2 = xor i128 %x, %tmp.1
+  %tmp.4 = add i128 %tmp.2, %tmp.5
+  ret i128 %tmp.4
+}
+
+;; (x & 254)+1 -> (x & 254)|1
+define i77 @test9(i77 %x) {
+; CHECK-LABEL: @test9(
+; CHECK-NEXT:    [[TMP_2:%.*]] = and i77 %x, 562949953421310
+; CHECK-NEXT:    [[TMP_4:%.*]] = or i77 [[TMP_2]], 1
+; CHECK-NEXT:    ret i77 [[TMP_4]]
+;
+  %tmp.2 = and i77 %x, 562949953421310
+  %tmp.4 = add i77 %tmp.2, 1
+  ret i77 %tmp.4
+}
+