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From: "patrick at rivosinc dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114396] New: [14] RISC-V rv64gcv vector: Runtime
 mismatch at -O3 with -fwrapv
Date: Tue, 19 Mar 2024 15:37:54 +0000
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X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114396

            Bug ID: 114396
           Summary: [14] RISC-V rv64gcv vector: Runtime mismatch at -O3
                    with -fwrapv
           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:
short a =3D 0xF;
short b[16];
int main() {
  for (int e =3D 0; e < 9; e +=3D 1)
    b[e] =3D a *=3D 0x5;
  __builtin_printf("decimal: %d\n", a);
  __builtin_printf("hex: %X\n", a);
}

Commands:
> /scratch/tc-testing/tc-mar-18/build-rv64gcv/bin/riscv64-unknown-linux-gnu=
-gcc -march=3Drv64gcv -O3 red.c -o red.out -fwrapv
> /scratch/tc-testing/tc-mar-18/build-rv64gcv/bin/qemu-riscv64 red.out
decimal: 32693
hex: 7FB5
> /scratch/tc-testing/tc-mar-18/build-rv64gcv/bin/riscv64-unknown-linux-gnu=
-gcc red.c -o red.out
> /scratch/tc-testing/tc-mar-18/build-rv64gcv/bin/qemu-riscv64 red.out
decimal: 2283
hex: 8EB

Discovered/tested using r14-9519-g3e3ad8eeb41 (not bisected)

Found using fuzzer.=