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* [Bug target/115264] New: RISC-V: yet another instance of poor codegen related to stack (glibc tmpnam.c)
@ 2024-05-28 21:30 vineetg at gcc dot gnu.org
0 siblings, 0 replies; only message in thread
From: vineetg at gcc dot gnu.org @ 2024-05-28 21:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115264
Bug ID: 115264
Summary: RISC-V: yet another instance of poor codegen related
to stack (glibc tmpnam.c)
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: vineetg at gcc dot gnu.org
CC: jeffreyalaw at gmail dot com, kito.cheng at gmail dot com
Target Milestone: ---
When working on sum of two s12 optim for function prologue/epilogue noticed
that glibc tempnam.c generates really poor code (as compared to llvm trunk)
--->8-----
typedef long unsigned int size_t;
extern int __gen_tempname (char *__tmpl, int __suffixlen, int __flags, int
__kind);
extern char *__strdup (const char *__string);
extern int __path_search (char *__tmpl, size_t __tmpl_len,
const char *__dir, const char *__pfx, int __try_tempdir);
char *
tempnam (const char *dir, const char *pfx)
{
char buf[4096];
if (__path_search (buf, 4096, dir, pfx, 1))
return ((void *)0) ;
if (__gen_tempname (buf, 0, 0, 2))
return ((void *)0) ;
return __strdup (buf);
}
--->8-----
- There's two copies of epilogue (for no seemingly obvious benefit)
- s0 is needlessly being spilled (likely one of RA passes generate the refs but
subsequent passes failing to eliminate) - sum of two s12 making it worse.
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2024-05-28 21:30 [Bug target/115264] New: RISC-V: yet another instance of poor codegen related to stack (glibc tmpnam.c) vineetg at gcc dot gnu.org
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