[InstCombine] add tests for sdiv-of-abs; NFC

Author: rotateright

llvm/test/Transforms/InstCombine/sdiv-canonicalize.ll

@@ -1,6 +1,10 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -instcombine -S | FileCheck %s
 
+declare void @use(i32)
+declare i32 @llvm.abs.i32(i32, i1)
+declare <4 x i32> @llvm.abs.v4i32(<4 x i32>, i1)
+
 define i32 @test_sdiv_canonicalize_op0(i32 %x, i32 %y) {
 ; CHECK-LABEL: @test_sdiv_canonicalize_op0(
 ; CHECK-NEXT:    [[SDIV1:%.*]] = sdiv i32 [[X:%.*]], [[Y:%.*]]
@@ -89,3 +93,49 @@ define i64 @test_sdiv_canonicalize_constexpr(i64 %L1) {
   %B4 = sdiv i64 %L1, %B8
   ret i64 %B4
 }
+
+define i32 @sdiv_abs_nsw(i32 %x) {
+; CHECK-LABEL: @sdiv_abs_nsw(
+; CHECK-NEXT:    [[A:%.*]] = call i32 @llvm.abs.i32(i32 [[X:%.*]], i1 true)
+; CHECK-NEXT:    [[R:%.*]] = sdiv i32 [[A]], [[X]]
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %a = call i32 @llvm.abs.i32(i32 %x, i1 true)
+  %r = sdiv i32 %a, %x
+  ret i32 %r
+}
+
+define <4 x i32> @sdiv_abs_nsw_vec(<4 x i32> %x) {
+; CHECK-LABEL: @sdiv_abs_nsw_vec(
+; CHECK-NEXT:    [[A:%.*]] = call <4 x i32> @llvm.abs.v4i32(<4 x i32> [[X:%.*]], i1 true)
+; CHECK-NEXT:    [[R:%.*]] = sdiv <4 x i32> [[X]], [[A]]
+; CHECK-NEXT:    ret <4 x i32> [[R]]
+;
+  %a = call <4 x i32> @llvm.abs.v4i32(<4 x i32> %x, i1 true)
+  %r = sdiv <4 x i32> %x, %a
+  ret <4 x i32> %r
+}
+
+define i32 @sdiv_abs(i32 %x) {
+; CHECK-LABEL: @sdiv_abs(
+; CHECK-NEXT:    [[A:%.*]] = call i32 @llvm.abs.i32(i32 [[X:%.*]], i1 false)
+; CHECK-NEXT:    [[R:%.*]] = sdiv i32 [[A]], [[X]]
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %a = call i32 @llvm.abs.i32(i32 %x, i1 false)
+  %r = sdiv i32 %a, %x
+  ret i32 %r
+}
+
+define i32 @sdiv_abs_extra_use(i32 %x) {
+; CHECK-LABEL: @sdiv_abs_extra_use(
+; CHECK-NEXT:    [[A:%.*]] = call i32 @llvm.abs.i32(i32 [[X:%.*]], i1 true)
+; CHECK-NEXT:    call void @use(i32 [[A]])
+; CHECK-NEXT:    [[R:%.*]] = sdiv i32 [[A]], [[X]]
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %a = call i32 @llvm.abs.i32(i32 %x, i1 true)
+  call void @use(i32 %a)
+  %r = sdiv i32 %a, %x
+  ret i32 %r
+}