https://gcc.gnu.org/PR124877 https://github.com/smuellerDD/leancrypto/issues/57 https://github.com/smuellerDD/leancrypto/commit/489ce1a1d913e09a7f1107f61c4f969f866551ee From 489ce1a1d913e09a7f1107f61c4f969f866551ee Mon Sep 17 00:00:00 2001 From: Stephan Mueller Date: Tue, 14 Apr 2026 11:57:46 +0200 Subject: [PATCH] Curve448 AVX2: fix ABI issue A uint8_t has to be copied into a register with movzbl as the upper 32 bits of a 64 bit movq instruction are undefined. Reported-bu: rguenth Signed-off-by: Stephan Mueller --- curve448/src/avx2/gf_p4482241_nsqr.S | 2 +- curve448/src/avx2/gf_p4482241_nsqrx.S | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/curve448/src/avx2/gf_p4482241_nsqr.S b/curve448/src/avx2/gf_p4482241_nsqr.S index 3d54fa7a..d8907515 100644 --- a/curve448/src/avx2/gf_p4482241_nsqr.S +++ b/curve448/src/avx2/gf_p4482241_nsqr.S @@ -93,7 +93,7 @@ movq %r13, 40(%rdi) movq %r14, 48(%rdi) movq %r15, 56(%rdi) -movq %rdx, %rcx +movzbl %dl, %ecx .START: diff --git a/curve448/src/avx2/gf_p4482241_nsqrx.S b/curve448/src/avx2/gf_p4482241_nsqrx.S index 0fee5d6a..04e62cd9 100644 --- a/curve448/src/avx2/gf_p4482241_nsqrx.S +++ b/curve448/src/avx2/gf_p4482241_nsqrx.S @@ -91,7 +91,7 @@ movq %r12, 32(%rdi) movq %r13, 40(%rdi) movq %r14, 48(%rdi) -movq %rdx, %rbx +movzbl %dl, %ebx .START_nsqrx: