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From: "patrick at rivosinc dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114028] New: [14] RISC-V rv64gcv_zvl256b: miscompile at
 -O3
Date: Wed, 21 Feb 2024 02:39:26 +0000
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X-Bugzilla-Component: target
X-Bugzilla-Version: 14.0
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X-Bugzilla-Who: patrick at rivosinc dot com
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114028

            Bug ID: 114028
           Summary: [14] RISC-V rv64gcv_zvl256b: miscompile at -O3
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: patrick at rivosinc dot com
  Target Milestone: ---

Testcase:
int a, d =3D 55003;
long c, h;
long e =3D 1;
char g;
short i;

int main() {
  g =3D 0;
  for (; g < 16; g +=3D 1) {
    d |=3D c;
    short l =3D d;
    i =3D l < 0 || a >> 4 ? d : a;
    h =3D i - 8L;
    e &=3D h;
  }

  if (e =3D=3D 1)
    return 0;
  else
    return 1;
}


Commands:
> /scratch/tc-testing/tc-feb-20/build-rv64gcv/bin/riscv64-unknown-linux-gnu=
-gcc -march=3Drv64gcv_zvl256b -O3 red.c -o red.out
> QEMU_CPU=3Drv64,vlen=3D256,v=3Dtrue,vext_spec=3Dv1.0,zve32f=3Dtrue,zve64f=
=3Dtrue /scratch/tc-testing/tc-feb-20-llvm/build/bin/qemu-riscv64 user-conf=
ig.out
> echo $?
1

> /scratch/tc-testing/tc-feb-20/build-rv64gcv/bin/riscv64-unknown-linux-gnu=
-gcc -march=3Drv64gcv_zvl256b -O2 red.c -o red.out
> QEMU_CPU=3Drv64,vlen=3D256,v=3Dtrue,vext_spec=3Dv1.0,zve32f=3Dtrue,zve64f=
=3Dtrue /scratch/tc-testing/tc-feb-20-llvm/build/bin/qemu-riscv64 red.out
> echo $?
0

Discovered/tested using 61ab046a327 (not bisected)
Found using fuzzer=