| ; RUN: llvm-as < %s | opt -instcombine | llvm-dis > %t |
| ; RUN: not grep zext %t |
| ; RUN: not grep sext %t |
| |
| ; Instcombine should be able to eliminate all of these ext casts. |
| |
| declare void @use(i32) |
| |
| define i64 @foo(i64 %a) { |
| %b = trunc i64 %a to i32 |
| %c = and i32 %b, 15 |
| %d = zext i32 %c to i64 |
| call void @use(i32 %b) |
| ret i64 %d |
| } |
| define i64 @bar(i64 %a) { |
| %b = trunc i64 %a to i32 |
| %c = shl i32 %b, 4 |
| %q = ashr i32 %c, 4 |
| %d = sext i32 %q to i64 |
| call void @use(i32 %b) |
| ret i64 %d |
| } |
| define i64 @goo(i64 %a) { |
| %b = trunc i64 %a to i32 |
| %c = and i32 %b, 8 |
| %d = zext i32 %c to i64 |
| call void @use(i32 %b) |
| ret i64 %d |
| } |
| define i64 @hoo(i64 %a) { |
| %b = trunc i64 %a to i32 |
| %c = and i32 %b, 8 |
| %x = xor i32 %c, 8 |
| %d = zext i32 %x to i64 |
| call void @use(i32 %b) |
| ret i64 %d |
| } |