mergefunc hits asserts on our bytecode

[thestinger]

Compile with rustc --passes mergefunc:

fn foo(_: &fn(uint, uint) -> uint) {}

fn bar() {
    foo(|_, u2| u2);
}

fn baz(x: &~[uint]) -> ~[uint] {
    x.clone()
}

Minimal IR:

target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

define internal i64 @foo(i64, i64) {
  ret i64 %1
}

define internal i64 @bar(i64*, i64) {
  ret i64 %1
}

define internal i64 @use_bar() {
  %1 = alloca i64 (i64*, i64)*
  store i64 (i64*, i64)* @bar, i64 (i64*, i64)** %1
  ret i64 undef
}

[sanxiyn]

http://llvm.org/bugs/show_bug.cgi?id=17099 seems to be related.

[thestinger]

@sanxiyn: yeah, the patch for that issue doesn't seem to fix this case though

[thestinger]

I'll report this upstream after waiting to see how the current fix in the queue pans out.

[thestinger]

Closing since this is an upstream problem. I'll make sure to deal with this.