Extend known bits to understand @llvm.bswap

[oota-llvm.git] / test / Transforms / InstSimplify / bswap.ll

diff --git a/test/Transforms/InstSimplify/bswap.ll b/test/Transforms/InstSimplify/bswap.ll
new file mode 100644 (file)
index 0000000..7bc3af9
--- /dev/null
+++ b/test/Transforms/InstSimplify/bswap.ll
@@ -0,0 +1,41 @@
+; RUN: opt < %s -S -instsimplify | FileCheck %s
+
+declare i16 @llvm.bswap.i16(i16)
+
+define i1 @test1(i16 %arg) {
+; CHECK-LABEL: @test1
+; CHECK: ret i1 false
+  %a = or i16 %arg, 1
+  %b = call i16 @llvm.bswap.i16(i16 %a)
+  %res = icmp eq i16 %b, 0
+  ret i1 %res
+}
+
+define i1 @test2(i16 %arg) {
+; CHECK-LABEL: @test2
+; CHECK: ret i1 false
+  %a = or i16 %arg, 1024
+  %b = call i16 @llvm.bswap.i16(i16 %a)
+  %res = icmp eq i16 %b, 0
+  ret i1 %res
+}
+
+define i1 @test3(i16 %arg) {
+; CHECK-LABEL: @test3
+; CHECK: ret i1 false
+  %a = and i16 %arg, 1
+  %b = call i16 @llvm.bswap.i16(i16 %a)
+  %and = and i16 %b, 1
+  %res = icmp eq i16 %and, 1
+  ret i1 %res
+}
+
+define i1 @test4(i16 %arg) {
+; CHECK-LABEL: @test4
+; CHECK: ret i1 false
+  %a = and i16 %arg, 511
+  %b = call i16 @llvm.bswap.i16(i16 %a)
+  %and = and i16 %b, 256
+  %res = icmp eq i16 %and, 1
+  ret i1 %res
+}