1 files changed, 69 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/bswap-fold.ll b/test/Transforms/InstCombine/bswap-fold.ll
new file mode 100644
index 0000000..034c70e
--- /dev/null
+++ b/test/Transforms/InstCombine/bswap-fold.ll
@@ -0,0 +1,69 @@
+; RUN: opt < %s -instcombine -S | not grep call.*bswap
+
+define i1 @test1(i16 %tmp2) {
+        %tmp10 = call i16 @llvm.bswap.i16( i16 %tmp2 )
+        %tmp = icmp eq i16 %tmp10, 1
+        ret i1 %tmp
+}
+
+define i1 @test2(i32 %tmp) {
+        %tmp34 = tail call i32 @llvm.bswap.i32( i32 %tmp )
+        %tmp.upgrd.1 = icmp eq i32 %tmp34, 1
+        ret i1 %tmp.upgrd.1
+}
+
+declare i32 @llvm.bswap.i32(i32)
+
+define i1 @test3(i64 %tmp) {
+        %tmp34 = tail call i64 @llvm.bswap.i64( i64 %tmp )
+        %tmp.upgrd.2 = icmp eq i64 %tmp34, 1
+        ret i1 %tmp.upgrd.2
+}
+
+declare i64 @llvm.bswap.i64(i64)
+
+declare i16 @llvm.bswap.i16(i16)
+
+; rdar://5992453
+; A & 255
+define i32 @test4(i32 %a) nounwind  {
+entry:
+	%tmp2 = tail call i32 @llvm.bswap.i32( i32 %a )	
+	%tmp4 = lshr i32 %tmp2, 24
+	ret i32 %tmp4
+}
+
+; A
+define i32 @test5(i32 %a) nounwind  {
+entry:
+	%tmp2 = tail call i32 @llvm.bswap.i32( i32 %a )
+	%tmp4 = tail call i32 @llvm.bswap.i32( i32 %tmp2 )
+	ret i32 %tmp4
+}
+
+; a >> 24
+define i32 @test6(i32 %a) nounwind  {
+entry:
+	%tmp2 = tail call i32 @llvm.bswap.i32( i32 %a )	
+	%tmp4 = and i32 %tmp2, 255
+	ret i32 %tmp4
+}
+
+; PR5284
+declare i64 @llvm.bswap.i64(i64)
+declare i32 @llvm.bswap.i32(i32)
+declare i16 @llvm.bswap.i16(i16)
+
+define i16 @test7(i32 %A) {
+  %B = tail call i32 @llvm.bswap.i32(i32 %A) nounwind 
+  %C = trunc i32 %B to i16
+  %D = tail call i16 @llvm.bswap.i16(i16 %C) nounwind
+  ret i16 %D
+}
+
+define i16 @test8(i64 %A) {
+  %B = tail call i64 @llvm.bswap.i64(i64 %A) nounwind 
+  %C = trunc i64 %B to i16
+  %D = tail call i16 @llvm.bswap.i16(i16 %C) nounwind
+  ret i16 %D
+}