http://llvm.org/bugs/show_bug.cgi?id=6552
Summary: Assigning fp to a variable results in "Couldn't
allocate output reg for constraint '{fp}'!"
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: ARM
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=4433)
--> (http://llvm.org/bugs/attachment.cgi?id=4433)
.ll file which results in a "Couldn't allocate output reg for constraint
'{fp}'!" error when compiled to object code.
Following C program compiled with llvm-gcc ("--target=arm-unknown-eabi
--with-arch=armv4"):
--8<--
extern void bar(unsigned int fp);
void foo(void)
{
register unsigned int fp __asm ("fp");
bar(fp);
}
--8<--
results in following .ll (in attachement as well):
--8<--
target datalayout =
"e-p:32:32:32-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-n32"
target triple = "armv4-unknown-eabi"
define arm_aapcscc void @foo() nounwind {
entry:
%fp = alloca i32 ; <i32*> [#uses=0]
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
%0 = call i32 asm "", "={fp}"() nounwind ; <i32> [#uses=1]
call arm_aapcscc void @bar(i32 %0) nounwind
br label %return
return: ; preds = %entry
ret void
}
--8<--
which results in a "Couldn't allocate output reg for constraint '{fp}'!" error
when compiled to object code.
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