http://llvm.org/bugs/show_bug.cgi?id=11045
Summary: clang does not support "o" inline asm constraint
Product: clang
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
The definition of the "o" constraint is "A memory operand is allowed, but only
if the address is offsettable. This means that adding a small integer
(actually, the width in bytes of the operand, as determined by its machine
mode) may be added to the address and the result is also a valid memory
address."
Testcase:
void test() {
char tmp[256];
__asm__ volatile(
"movl 1+%0, %%eax"
:
:"o"(tmp[128]));
}
Here, tmp[128] maps to "(%rsp)" producing "movl 1+(%rsp), %eax", so that fails.
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