1 files changed, 41 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/abs-1.ll b/test/Transforms/InstCombine/abs-1.ll
new file mode 100644
index 0000000000..807f238755
--- /dev/null
+++ b/test/Transforms/InstCombine/abs-1.ll
@@ -0,0 +1,41 @@
+; Test that the abs library call simplifier works correctly.
+;
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+
+declare i32 @abs(i32)
+declare i64 @labs(i64)
+declare i64 @llabs(i64)
+
+; Check abs(x) -> x >s -1 ? x : -x.
+
+define i32 @test_simplify1(i32 %x) {
+; CHECK: @test_simplify1
+  %ret = call i32 @abs(i32 %x)
+; CHECK-NEXT: [[ISPOS:%[a-z0-9]+]] = icmp sgt i32 %x, -1
+; CHECK-NEXT: [[NEG:%[a-z0-9]+]] = sub i32 0, %x
+; CHECK-NEXT: [[RET:%[a-z0-9]+]] = select i1 [[ISPOS]], i32 %x, i32 [[NEG]]
+  ret i32 %ret
+; CHECK-NEXT: ret i32 [[RET]]
+}
+
+define i64 @test_simplify2(i64 %x) {
+; CHECK: @test_simplify2
+  %ret = call i64 @labs(i64 %x)
+; CHECK-NEXT: [[ISPOS:%[a-z0-9]+]] = icmp sgt i64 %x, -1
+; CHECK-NEXT: [[NEG:%[a-z0-9]+]] = sub i64 0, %x
+; CHECK-NEXT: [[RET:%[a-z0-9]+]] = select i1 [[ISPOS]], i64 %x, i64 [[NEG]]
+  ret i64 %ret
+; CHECK-NEXT: ret i64 [[RET]]
+}
+
+define i64 @test_simplify3(i64 %x) {
+; CHECK: @test_simplify3
+  %ret = call i64 @llabs(i64 %x)
+; CHECK-NEXT: [[ISPOS:%[a-z0-9]+]] = icmp sgt i64 %x, -1
+; CHECK-NEXT: [[NEG:%[a-z0-9]+]] = sub i64 0, %x
+; CHECK-NEXT: [[RET:%[a-z0-9]+]] = select i1 [[ISPOS]], i64 %x, i64 [[NEG]]
+  ret i64 %ret
+; CHECK-NEXT: ret i64 [[RET]]
+}