[InstCombine] Add tests for folding `(add/sub/disjoint_or/icmp C, (ctpop (not x)))`; NFC

1 files changed, 235 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InstCombine/fold-ctpop-of-not.ll b/llvm/test/Transforms/InstCombine/fold-ctpop-of-not.ll
new file mode 100644
index 0000000..008a6f6
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/fold-ctpop-of-not.ll
@@ -0,0 +1,235 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -passes=instcombine -S | FileCheck %s
+
+declare void @use.i8(i8)
+declare i8 @llvm.ctpop.i8(i8)
+declare i2 @llvm.ctpop.i2(i2)
+declare <2 x i8> @llvm.ctpop.v2i8(<2 x i8>)
+
+define i8 @fold_sub_c_ctpop(i8 %x) {
+; CHECK-LABEL: @fold_sub_c_ctpop(
+; CHECK-NEXT:    [[NX:%.*]] = xor i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[CNT:%.*]] = call i8 @llvm.ctpop.i8(i8 [[NX]]), !range [[RNG0:![0-9]+]]
+; CHECK-NEXT:    [[R:%.*]] = sub nuw nsw i8 12, [[CNT]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %nx = xor i8 %x, -1
+  %cnt = call i8 @llvm.ctpop.i8(i8 %nx)
+  %r = sub i8 12, %cnt
+  ret i8 %r
+}
+
+define i8 @fold_sub_var_ctpop_fail(i8 %x, i8 %y) {
+; CHECK-LABEL: @fold_sub_var_ctpop_fail(
+; CHECK-NEXT:    [[NX:%.*]] = xor i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[CNT:%.*]] = call i8 @llvm.ctpop.i8(i8 [[NX]]), !range [[RNG0]]
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[Y:%.*]], [[CNT]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %nx = xor i8 %x, -1
+  %cnt = call i8 @llvm.ctpop.i8(i8 %nx)
+  %r = sub i8 %y, %cnt
+  ret i8 %r
+}
+
+define <2 x i8> @fold_sub_ctpop_c(<2 x i8> %x) {
+; CHECK-LABEL: @fold_sub_ctpop_c(
+; CHECK-NEXT:    [[NX:%.*]] = xor <2 x i8> [[X:%.*]], <i8 -1, i8 -1>
+; CHECK-NEXT:    [[CNT:%.*]] = call <2 x i8> @llvm.ctpop.v2i8(<2 x i8> [[NX]]), !range [[RNG0]]
+; CHECK-NEXT:    [[R:%.*]] = add nuw nsw <2 x i8> [[CNT]], <i8 -63, i8 -64>
+; CHECK-NEXT:    ret <2 x i8> [[R]]
+;
+  %nx = xor <2 x i8> %x, <i8 -1, i8 -1>
+  %cnt = call <2 x i8> @llvm.ctpop.v2i8(<2 x i8> %nx)
+  %r = sub <2 x i8> %cnt, <i8 63, i8 64>
+  ret <2 x i8> %r
+}
+
+define i8 @fold_add_ctpop_c(i8 %x) {
+; CHECK-LABEL: @fold_add_ctpop_c(
+; CHECK-NEXT:    [[NX:%.*]] = xor i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[CNT:%.*]] = call i8 @llvm.ctpop.i8(i8 [[NX]]), !range [[RNG0]]
+; CHECK-NEXT:    [[R:%.*]] = add nuw nsw i8 [[CNT]], 63
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %nx = xor i8 %x, -1
+  %cnt = call i8 @llvm.ctpop.i8(i8 %nx)
+  %r = add i8 %cnt, 63
+  ret i8 %r
+}
+
+define i8 @fold_distjoint_or_ctpop_c(i8 %x) {
+; CHECK-LABEL: @fold_distjoint_or_ctpop_c(
+; CHECK-NEXT:    [[NX:%.*]] = xor i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[CNT:%.*]] = call i8 @llvm.ctpop.i8(i8 [[NX]]), !range [[RNG0]]
+; CHECK-NEXT:    [[R:%.*]] = or disjoint i8 [[CNT]], 64
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %nx = xor i8 %x, -1
+  %cnt = call i8 @llvm.ctpop.i8(i8 %nx)
+  %r = or i8 %cnt, 64
+  ret i8 %r
+}
+
+define i8 @fold_or_ctpop_c_fail(i8 %x) {
+; CHECK-LABEL: @fold_or_ctpop_c_fail(
+; CHECK-NEXT:    [[NX:%.*]] = xor i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[CNT:%.*]] = call i8 @llvm.ctpop.i8(i8 [[NX]]), !range [[RNG0]]
+; CHECK-NEXT:    [[R:%.*]] = or i8 [[CNT]], 65
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %nx = xor i8 %x, -1
+  %cnt = call i8 @llvm.ctpop.i8(i8 %nx)
+  %r = or i8 %cnt, 65
+  ret i8 %r
+}
+
+define i8 @fold_add_ctpop_var_fail(i8 %x, i8 %y) {
+; CHECK-LABEL: @fold_add_ctpop_var_fail(
+; CHECK-NEXT:    [[NX:%.*]] = xor i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[CNT:%.*]] = call i8 @llvm.ctpop.i8(i8 [[NX]]), !range [[RNG0]]
+; CHECK-NEXT:    [[R:%.*]] = add i8 [[CNT]], [[Y:%.*]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %nx = xor i8 %x, -1
+  %cnt = call i8 @llvm.ctpop.i8(i8 %nx)
+  %r = add i8 %cnt, %y
+  ret i8 %r
+}
+
+define i1 @fold_icmp_sgt_ctpop_c_i2_fail(i2 %x, i2 %C) {
+; CHECK-LABEL: @fold_icmp_sgt_ctpop_c_i2_fail(
+; CHECK-NEXT:    ret i1 false
+;
+  %nx = xor i2 %x, -1
+  %cnt = tail call i2 @llvm.ctpop.i2(i2 %nx)
+  %r = icmp sgt i2 %cnt, 1
+  ret i1 %r
+}
+
+define i1 @fold_cmp_eq_ctpop_c(i8 %x) {
+; CHECK-LABEL: @fold_cmp_eq_ctpop_c(
+; CHECK-NEXT:    [[NX:%.*]] = xor i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[CNT:%.*]] = call i8 @llvm.ctpop.i8(i8 [[NX]]), !range [[RNG0]]
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[CNT]], 2
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %nx = xor i8 %x, -1
+  %cnt = call i8 @llvm.ctpop.i8(i8 %nx)
+  %r = icmp eq i8 %cnt, 2
+  ret i1 %r
+}
+
+define i1 @fold_cmp_eq_ctpop_c_multiuse_fail(i8 %x) {
+; CHECK-LABEL: @fold_cmp_eq_ctpop_c_multiuse_fail(
+; CHECK-NEXT:    [[NX:%.*]] = xor i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[CNT:%.*]] = call i8 @llvm.ctpop.i8(i8 [[NX]]), !range [[RNG0]]
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[CNT]], 2
+; CHECK-NEXT:    call void @use.i8(i8 [[CNT]])
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %nx = xor i8 %x, -1
+  %cnt = call i8 @llvm.ctpop.i8(i8 %nx)
+  %r = icmp eq i8 %cnt, 2
+  call void @use.i8(i8 %cnt)
+  ret i1 %r
+}
+
+define <2 x i1> @fold_cmp_ne_ctpop_c(<2 x i8> %x) {
+; CHECK-LABEL: @fold_cmp_ne_ctpop_c(
+; CHECK-NEXT:    [[NX:%.*]] = xor <2 x i8> [[X:%.*]], <i8 -1, i8 -1>
+; CHECK-NEXT:    [[CNT:%.*]] = call <2 x i8> @llvm.ctpop.v2i8(<2 x i8> [[NX]]), !range [[RNG0]]
+; CHECK-NEXT:    [[R:%.*]] = icmp ne <2 x i8> [[CNT]], <i8 44, i8 3>
+; CHECK-NEXT:    ret <2 x i1> [[R]]
+;
+  %nx = xor <2 x i8> %x, <i8 -1, i8 -1>
+  %cnt = call <2 x i8> @llvm.ctpop.v2i8(<2 x i8> %nx)
+  %r = icmp ne <2 x i8> %cnt, <i8 44, i8 3>
+  ret <2 x i1> %r
+}
+
+define <2 x i1> @fold_cmp_ne_ctpop_var_fail(<2 x i8> %x, <2 x i8> %y) {
+; CHECK-LABEL: @fold_cmp_ne_ctpop_var_fail(
+; CHECK-NEXT:    [[NX:%.*]] = xor <2 x i8> [[X:%.*]], <i8 -1, i8 -1>
+; CHECK-NEXT:    [[CNT:%.*]] = call <2 x i8> @llvm.ctpop.v2i8(<2 x i8> [[NX]]), !range [[RNG0]]
+; CHECK-NEXT:    [[R:%.*]] = icmp ne <2 x i8> [[CNT]], [[Y:%.*]]
+; CHECK-NEXT:    ret <2 x i1> [[R]]
+;
+  %nx = xor <2 x i8> %x, <i8 -1, i8 -1>
+  %cnt = call <2 x i8> @llvm.ctpop.v2i8(<2 x i8> %nx)
+  %r = icmp ne <2 x i8> %cnt, %y
+  ret <2 x i1> %r
+}
+
+define i1 @fold_cmp_ult_ctpop_c(i8 %x, i8 %y, i1 %cond) {
+; CHECK-LABEL: @fold_cmp_ult_ctpop_c(
+; CHECK-NEXT:    [[NX:%.*]] = xor i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[NY:%.*]] = add i8 [[Y:%.*]], 15
+; CHECK-NEXT:    [[N:%.*]] = select i1 [[COND:%.*]], i8 [[NX]], i8 [[NY]]
+; CHECK-NEXT:    [[CNT:%.*]] = call i8 @llvm.ctpop.i8(i8 [[N]]), !range [[RNG0]]
+; CHECK-NEXT:    [[R:%.*]] = icmp ult i8 [[CNT]], 5
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %nx = xor i8 %x, -1
+  %ny = add i8 %y, 15
+  %n = select i1 %cond, i8 %nx, i8 %ny
+  %cnt = call i8 @llvm.ctpop.i8(i8 %n)
+  %r = icmp ult i8 %cnt, 5
+  ret i1 %r
+}
+
+define i1 @fold_cmp_sle_ctpop_c(i8 %x, i8 %y, i1 %cond) {
+; CHECK-LABEL: @fold_cmp_sle_ctpop_c(
+; CHECK-NEXT:    [[NX:%.*]] = xor i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[NY:%.*]] = add i8 [[Y:%.*]], 15
+; CHECK-NEXT:    [[N:%.*]] = select i1 [[COND:%.*]], i8 [[NX]], i8 [[NY]]
+; CHECK-NEXT:    [[CNT:%.*]] = call i8 @llvm.ctpop.i8(i8 [[N]]), !range [[RNG0]]
+; CHECK-NEXT:    [[R:%.*]] = icmp ult i8 [[CNT]], 4
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %nx = xor i8 %x, -1
+  %ny = add i8 %y, 15
+  %n = select i1 %cond, i8 %nx, i8 %ny
+  %cnt = call i8 @llvm.ctpop.i8(i8 %n)
+  %r = icmp sle i8 %cnt, 3
+  ret i1 %r
+}
+
+define i1 @fold_cmp_ult_ctpop_c_no_not_inst_save_fail(i8 %x) {
+; CHECK-LABEL: @fold_cmp_ult_ctpop_c_no_not_inst_save_fail(
+; CHECK-NEXT:    [[NX:%.*]] = xor i8 [[X:%.*]], -2
+; CHECK-NEXT:    [[CNT:%.*]] = call i8 @llvm.ctpop.i8(i8 [[NX]]), !range [[RNG0]]
+; CHECK-NEXT:    [[R:%.*]] = icmp ult i8 [[CNT]], 5
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %nx = xor i8 %x, -2
+  %cnt = call i8 @llvm.ctpop.i8(i8 %nx)
+  %r = icmp ult i8 %cnt, 5
+  ret i1 %r
+}
+
+define <2 x i1> @fold_cmp_ugt_ctpop_c(<2 x i8> %x) {
+; CHECK-LABEL: @fold_cmp_ugt_ctpop_c(
+; CHECK-NEXT:    [[NX:%.*]] = xor <2 x i8> [[X:%.*]], <i8 -1, i8 -1>
+; CHECK-NEXT:    [[CNT:%.*]] = call <2 x i8> @llvm.ctpop.v2i8(<2 x i8> [[NX]]), !range [[RNG0]]
+; CHECK-NEXT:    [[R:%.*]] = icmp ugt <2 x i8> [[CNT]], <i8 8, i8 6>
+; CHECK-NEXT:    ret <2 x i1> [[R]]
+;
+  %nx = xor <2 x i8> %x, <i8 -1, i8 -1>
+  %cnt = call <2 x i8> @llvm.ctpop.v2i8(<2 x i8> %nx)
+  %r = icmp ugt <2 x i8> %cnt, <i8 8, i8 6>
+  ret <2 x i1> %r
+}
+
+define <2 x i1> @fold_cmp_ugt_ctpop_c_out_of_range_fail(<2 x i8> %x) {
+; CHECK-LABEL: @fold_cmp_ugt_ctpop_c_out_of_range_fail(
+; CHECK-NEXT:    [[NX:%.*]] = xor <2 x i8> [[X:%.*]], <i8 -1, i8 -1>
+; CHECK-NEXT:    [[CNT:%.*]] = call <2 x i8> @llvm.ctpop.v2i8(<2 x i8> [[NX]]), !range [[RNG0]]
+; CHECK-NEXT:    [[R:%.*]] = icmp ugt <2 x i8> [[CNT]], <i8 2, i8 10>
+; CHECK-NEXT:    ret <2 x i1> [[R]]
+;
+  %nx = xor <2 x i8> %x, <i8 -1, i8 -1>
+  %cnt = call <2 x i8> @llvm.ctpop.v2i8(<2 x i8> %nx)
+  %r = icmp ugt <2 x i8> %cnt, <i8 2, i8 10>
+  ret <2 x i1> %r
+}