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From: "patrick at rivosinc dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/116318] New: RISC-V: Miscompile at -O1 with
 -fwhole-program
Date: Fri, 09 Aug 2024 23:56:29 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 15.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: patrick at rivosinc dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D116318

            Bug ID: 116318
           Summary: RISC-V: Miscompile at -O1 with -fwhole-program
           Product: gcc
           Version: 15.0
            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, c, d;
short b[][8] =3D {};
int main() {
  for (; d < 7; d++) {
    a =3D b[d][c];
    __builtin_printf("%lX\n", a ^ 4095UL);
  }
}

Commands:
> /scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/bin/riscv64-unknown-=
linux-gnu-gcc -fwhole-program -O1 preprocessed.c -o test.o
> /scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/bin/qemu-riscv64 tes=
t.o
14FE
FC3
F97
75FC
FE7
FEB
FFF

> /scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/bin/riscv64-unknown-=
linux-gnu-gcc -fwhole-program -O0 preprocessed.c -o test.o
> /scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/bin/qemu-riscv64 tes=
t.o
FFF
FFF
FFF
FFF
FFF
FFF
FFF

Found via fuzzer.=