File: 2009-04-22-TruncCast.ll

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llvm 2.6-9.1
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; RUN: llvm-as < %s | opt -analyze -scalar-evolution -disable-output | grep {(trunc i} | not grep ext

define i16 @test1(i8 %x) {
  %A = sext i8 %x to i32
  %B = trunc i32 %A to i16
  ret i16 %B
}

define i8 @test2(i16 %x) {
  %A = sext i16 %x to i32
  %B = trunc i32 %A to i8
  ret i8 %B
}

define i16 @test3(i16 %x) {
  %A = sext i16 %x to i32
  %B = trunc i32 %A to i16
  ret i16 %B
}

define i16 @test4(i8 %x) {
  %A = zext i8 %x to i32
  %B = trunc i32 %A to i16
  ret i16 %B
}

define i8 @test5(i16 %x) {
  %A = zext i16 %x to i32
  %B = trunc i32 %A to i8
  ret i8 %B
}

define i16 @test6(i16 %x) {
  %A = zext i16 %x to i32
  %B = trunc i32 %A to i16
  ret i16 %B
}