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From: "sjames at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/112430] [14 Regression] ICE: verify_ssa failed, missing definition
Date: Wed, 08 Nov 2023 00:52:34 +0000	[thread overview]
Message-ID: <bug-112430-4-u6bXwqeAAj@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-112430-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112430

--- Comment #3 from Sam James <sjames at gcc dot gnu.org> ---
Better reduction without uninit:
```
int secp256k1_scalar_reduce_512_r_0_0, secp256k1_scalar_reduce_512_m6,
    secp256k1_scalar_reduce_512_m9, secp256k1_scalar_reduce_512_th,
    secp256k1_scalar_reduce_512_tl;
unsigned int secp256k1_scalar_reduce_512_c0;
void secp256k1_scalar_reduce_512(unsigned int c1) {
  unsigned int c2 = c1 < secp256k1_scalar_reduce_512_th;
  int over = secp256k1_scalar_reduce_512_c0 < secp256k1_scalar_reduce_512_m9;
  c1 += over;
  c2 += c1 < over;
  secp256k1_scalar_reduce_512_c0 = c1;
  c1 = c2;
  c2 = secp256k1_scalar_reduce_512_c0 += secp256k1_scalar_reduce_512_m6;
  over = secp256k1_scalar_reduce_512_c0 < secp256k1_scalar_reduce_512_m6;
  c1 += over;
  secp256k1_scalar_reduce_512_th +=
      secp256k1_scalar_reduce_512_c0 < secp256k1_scalar_reduce_512_tl;
  c1 += secp256k1_scalar_reduce_512_th;
  c2 += c1 < secp256k1_scalar_reduce_512_th;
  secp256k1_scalar_reduce_512_r_0_0 = c2;
}
void secp256k1_ecdsa_sig_sign(unsigned int c1) {
secp256k1_scalar_reduce_512(c1); }
```

  parent reply	other threads:[~2023-11-08  0:52 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-07 23:48 [Bug tree-optimization/112430] New: " public at timruffing dot de
2023-11-08  0:21 ` [Bug tree-optimization/112430] " sjames at gcc dot gnu.org
2023-11-08  0:50 ` sjames at gcc dot gnu.org
2023-11-08  0:52 ` sjames at gcc dot gnu.org [this message]
2023-11-08  2:05 ` sjames at gcc dot gnu.org
2023-11-08  2:40 ` [Bug middle-end/112430] [14 Regression] ICE: verify_ssa failed, missing definition since r14-1837-g43a3252c42af12 sjames at gcc dot gnu.org
2023-11-08  3:16 ` pinskia at gcc dot gnu.org
2023-11-08  8:05 ` [Bug tree-optimization/112430] " rguenth at gcc dot gnu.org
2023-11-10 12:52 ` jakub at gcc dot gnu.org
2023-11-11 19:16 ` cvs-commit at gcc dot gnu.org
2023-11-11 19:16 ` jakub at gcc dot gnu.org

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