http://llvm.org/bugs/show_bug.cgi?id=4186
Summary: missed IR opt: eliminate unused bitcast in call
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Scalar Optimizations
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
The bitcast below can be eliminated:
--
ddun...@frank:test$ cat t.c
void f0(void) {
f1();
}
void f1(void);
ddun...@frank:test$ llvm-gcc -O3 -emit-llvm -S -o - t.c
t.c:5: warning: conflicting types for âf1â
t.c:2: warning: previous implicit declaration of âf1â was here
; ModuleID = 't.c'
target datalayout =
"e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32"
target triple = "i386-pc-linux-gnu"
define void @f0() nounwind {
entry:
%0 = tail call i32 (...)* bitcast (void ()* @f1 to i32 (...)*)()
nounwind ; <i32> [#uses=0]
ret void
}
declare void @f1()
--
The example C code is lame, but this situation also occurs during linking.
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