From e91f015b62d72158c4f69a5b1cbf87fba4599ba1 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Sat, 5 Aug 2023 16:07:34 -0700 Subject: [PATCH] tcg/i386: Use shift in tcg_out_setcond For LT/GE vs zero, shift down the sign bit. Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson --- tcg/i386/tcg-target.c.inc | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/tcg/i386/tcg-target.c.inc b/tcg/i386/tcg-target.c.inc index 3f3c114efd..16e830051d 100644 --- a/tcg/i386/tcg-target.c.inc +++ b/tcg/i386/tcg-target.c.inc @@ -1578,6 +1578,21 @@ static void tcg_out_setcond(TCGContext *s, int rexw, TCGCond cond, } return; + case TCG_COND_GE: + inv = true; + /* fall through */ + case TCG_COND_LT: + /* If arg2 is 0, extract the sign bit. */ + if (const_arg2 && arg2 == 0) { + tcg_out_mov(s, rexw ? TCG_TYPE_I64 : TCG_TYPE_I32, dest, arg1); + if (inv) { + tcg_out_modrm(s, OPC_GRP3_Ev + rexw, EXT3_NOT, dest); + } + tcg_out_shifti(s, SHIFT_SHR + rexw, dest, rexw ? 63 : 31); + return; + } + break; + default: break; } -- 2.11.4.GIT