From 32d1c0a5614b9979768b3711726db3d601750ed3 Mon Sep 17 00:00:00 2001
From: Stefan <stefan-guix@vodafonemail.de>
Date: Wed, 4 Nov 2026 13:25:31 +0100
Subject: [PATCH] x86_64: Fix long double to int cast

x86_64-gen.c:
- gen_cvt_ftoi()
    Use TOK___fixxfdi for VT_LDOUBLE independently of the size of the
    target integer type, avoiding a wrong conversion to doube.

    This solves:

    int main(void) {
        long double x = 0.999999999999999999l;
        return (int)x;
    }

    Before for VT_INT a long double was first converted to double with
    rounding, possibly leading to a wrong result when truncating with
    cvttsd2si.
---
 x86_64-gen.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/x86_64-gen.c b/x86_64-gen.c
index c62c8a0c..ac5c50a9 100644
--- a/x86_64-gen.c
+++ b/x86_64-gen.c
@@ -2121,17 +2121,14 @@ void gen_cvt_ftoi(int t)
     ft = vtop->type.t;
     bt = ft & VT_BTYPE;
     if (bt == VT_LDOUBLE) {
-	if (t != VT_INT) {
-	    vpush_helper_func(TOK___fixxfdi);
-	    vswap();
-	    gfunc_call(1);
-	    vpushi(0);
-	    vtop->r = REG_IRET;
+        vpush_helper_func(TOK___fixxfdi);
+        vswap();
+        gfunc_call(1);
+        vpushi(0);
+        vtop->r = REG_IRET;
+        if (t != VT_INT)
 	    vtop->r2 = REG_IRE2;
-	    return;
-	}
-        gen_cvt_ftof(VT_DOUBLE);
-        bt = VT_DOUBLE;
+        return;
     }
 
     gv(RC_FLOAT);