http://llvm.org/bugs/show_bug.cgi?id=5406
Summary: Invalid call lowering 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]
In the C code
-------------
typedef struct { char x[3]; } A0;
void foo (int i, ...);
int main (void)
{
A0 a3;
a3.x[0] = 0;
a3.x[0] = 0;
a3.x[2] = 26;
foo (1, a3 );
return 0;
}
------------
The call is lowered by llvm-gcc to
tail call arm_aapcscc void (i32, ...)* @foo(i32 11, i16 0, i8 26) nounwind
Which is incorrect. All of a3 should be passed in R1 and the above call splits
it in R1 and R2.
clang produces correct code:
%tmp11 = insertvalue [1 x i32] undef, i32 1703936, 0 ; <[1 x i32]> [#uses=1]
%tmp12 = insertvalue %0 undef, [1 x i32] %tmp11, 0 ; <%0> [#uses=1]
tail call arm_aapcscc void (i32, ...)* @foo(i32 1, %0 %tmp12) nounwind
Note that 1703936 is 0x1a0000 which is 26 with two 0 bytes added.
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