https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116197
Bug ID: 116197
Summary: [14/15 only] RISC-V: zvkn does not imply "v" extension
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, b;
int main() {
for (; a < 6; a++) {
b = 8;
if (a)
b = 0;
}
}
Command:
> /scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/bin/riscv64-unknown-linux-gnu-gcc
> -O3 -march=rv64imzvkn_d red.c -w -o red.out
> QEMU_CPU=rv64,vlen=64,rvv_ta_all_1s=true,rvv_ma_all_1s=true
> /scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/bin/qemu-riscv64 red.out
zsh: illegal hardware instruction (core dumped)
QEMU_CPU=rv64,vlen=64,rvv_ta_all_1s=true,rvv_ma_all_1s=true red.out
v isn't defined in any of the isa strings in the final file:
> /scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/bin/riscv64-unknown-linux-gnu-readelf
> -a --wide red.out | grep "rv"
29: 0000000000010464 0 NOTYPE LOCAL DEFAULT 11
$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_c2p0_zicsr2p0_zmmul1p0_zaamo1p0_zalrsc1p0_zca1p0_zcd1p0
34: 0000000000010494 0 NOTYPE LOCAL DEFAULT 11
$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_c2p0_zicsr2p0_zmmul1p0_zaamo1p0_zalrsc1p0_zca1p0_zcd1p0
36: 00000000000103f0 0 NOTYPE LOCAL DEFAULT 11
$xrv64i2p1_m2p0_f2p2_d2p2_zicsr2p0_zmmul1p0_zve32x1p0_zve64x1p0_zvkb1p0_zvkn1p0_zvkned1p0_zvknha1p0_zvknhb1p0_zvkt1p0_zvl32b1p0_zvl64b1p0
39: 0000000000010496 0 NOTYPE LOCAL DEFAULT 11
$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_c2p0_zicsr2p0_zmmul1p0_zaamo1p0_zalrsc1p0_zca1p0_zcd1p0
Tag_RISCV_arch:
"rv64i2p1_m2p0_a2p1_f2p2_d2p2_c2p0_zicsr2p0_zmmul1p0_zaamo1p0_zalrsc1p0_zca1p0_zcd1p0_zve32x1p0_zve64x1p0_zvkb1p0_zvkn1p0_zvkned1p0_zvknha1p0_zvknhb1p0_zvkt1p0_zvl32b1p0_zvl64b1p0"
Godbolt: https://godbolt.org/z/1PnY6cjs8
>From the zvkn spec:
>The Zvknhb and Zvbc Vector Crypto Extensions --and accordingly the composite
>extensions Zvkn
>and Zvks-- require a Zve64x base, or application ("V") base Vector Extension.
https://github.com/riscv/riscv-crypto/releases
See also: pr116150
