http://llvm.org/bugs/show_bug.cgi?id=6059
Summary: Insuficent allignment on call on ARM
Product: tools
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: llvm-gcc
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
The code
-----------------------
#include <stdio.h>
typedef struct QuadWordS_struct { int i; double d; } QuadWordS;
void test(int a, QuadWordS qw);
int main() {
QuadWordS qw = { 19, 0.0 };
test(0, qw);
return 0;
}
-----------------------
gets compiled to
------------------------
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 = "armv5-none-linux-gnueabi"
%struct.QuadWordS = type { i32, double }
define arm_aapcscc i32 @main() nounwind optsize {
entry:
tail call arm_aapcscc void @test(i32 0, i32 19, i32 0, i32 0, i32 0)
nounwind
ret i32 0
}
declare arm_aapcscc void @test(i32, i32, i32, i32, i32)
------------------------
The problem is that the struct requires 64 bit alignment. The correct lowering
of the call is
tail call arm_aapcscc void @test(i32 0, i32 0, i32 19, i32 0, i32 0, i32 0)
nounwind
and "test" should be declared as
declare arm_aapcscc void @test(i32, i32, i32, i32, i32, i32)
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