https://bugs.llvm.org/show_bug.cgi?id=35121
Bug ID: 35121
Summary: optimize re-materialization of FP constants
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: AArch64
Assignee: unassignedb...@nondot.org
Reporter: compn...@compnerd.org
CC: llvm-bugs@lists.llvm.org
Consider the following piece of C code:
```
#include <stdarg.h>
void h(va_list);
void g(const char *s, ...) {
va_list args;
va_start(args, s);
h(args);
va_end(args);
}
void f(void) {
g("",
1, 2, 3, 4, 5, 6, 7, 8, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0,
1, 2, 3, 4, 5, 6, 7, 8, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0);
}
```
We re-materialize the floating point values twice (once in the GPR and once in
the FPR). The GPR materialization is instantiated to spill onto the stack.
However, it would be possible to use the FPR materialization to spill on to the
stack.
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