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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 <smueller@chronox.de>
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 <smueller@chronox.de>
---
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:
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