From 20b224046c61ccc9a8e847cd0665f9f39e9a8ff9 Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Tue, 20 Apr 2021 19:03:15 +0200 Subject: [PATCH] tls: further reduce register pressure in i386 assembly function old new delta pstm_montgomery_reduce 435 431 -4 Signed-off-by: Denys Vlasenko --- networking/tls_pstm_montgomery_reduce.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/networking/tls_pstm_montgomery_reduce.c b/networking/tls_pstm_montgomery_reduce.c index e8857f394..4181a0590 100644 --- a/networking/tls_pstm_montgomery_reduce.c +++ b/networking/tls_pstm_montgomery_reduce.c @@ -102,11 +102,11 @@ asm( \ #define PROPCARRY \ asm( \ "addl %1,%0 \n\t" \ - "setb %%al \n\t" \ - "movzbl %%al,%1 \n\t" \ + "sbb %1,%1 \n\t" \ + "neg %1 \n\t" \ :"=g"(_c[LO]), "=r"(cy) \ :"0"(_c[LO]), "1"(cy) \ -: "%eax", "cc") +:"cc") /******************************************************************************/ #elif defined(PSTM_X86_64)