Commit 7720966392 for qemu.org

commit 77209663924e969411ff9fff280a4090382ebceb
Author: Richard Henderson <richard.henderson@linaro.org>
Date:   Mon Sep 14 11:59:16 2026 -1000

    target/i386/tcg: Always initialize CCPrepare.reg

    Forthcoming tcg improvements will diagnose the passed
    null pointer with --enable-ubsan:

    ../src/target/i386/tcg/translate.c:1177:5: runtime error: null pointer passed as argument 3, which is declared to never be null
        #0 ... in gen_setcc ../src/target/i386/tcg/translate.c:1177
        #1 ... in gen_compute_eflags_c ../src/target/i386/tcg/translate.c:1182
        #2 ... in prepare_update_cc_incdec ../src/target/i386/tcg/emit.c.inc:407
        #3 ... in gen_INC ../src/target/i386/tcg/emit.c.inc:2213
        #4 ... in disas_insn ../src/target/i386/tcg/decode-new.c.inc:3151
        #5 ... in i386_tr_translate_insn ../src/target/i386/tcg/translate.c:3514

    Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
    Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index d8de290acb..192cf43215 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -891,7 +891,7 @@ static CCPrepare gen_prepare_eflags_c(DisasContext *s, TCGv reg)

     case CC_OP_LOGICB ... CC_OP_LOGICQ:
     case CC_OP_POPCNT:
-        return (CCPrepare) { .cond = TCG_COND_NEVER };
+        return (CCPrepare) { .cond = TCG_COND_NEVER, .reg = cpu_cc_dst };

     case CC_OP_INCB ... CC_OP_INCQ:
     case CC_OP_DECB ... CC_OP_DECQ:
@@ -965,7 +965,7 @@ static CCPrepare gen_prepare_eflags_s(DisasContext *s, TCGv reg)
         return (CCPrepare) { .cond = TCG_COND_TSTNE, .reg = cpu_cc_src,
                              .imm = CC_S };
     case CC_OP_POPCNT:
-        return (CCPrepare) { .cond = TCG_COND_NEVER };
+        return (CCPrepare) { .cond = TCG_COND_NEVER, .reg = cpu_cc_dst };
     default:
         return gen_prepare_sign_nz(cpu_cc_dst, cc_op_size(s->cc_op));
     }
@@ -982,7 +982,7 @@ static CCPrepare gen_prepare_eflags_o(DisasContext *s, TCGv reg)
     case CC_OP_SBB_SELF:
     case CC_OP_LOGICB ... CC_OP_LOGICQ:
     case CC_OP_POPCNT:
-        return (CCPrepare) { .cond = TCG_COND_NEVER };
+        return (CCPrepare) { .cond = TCG_COND_NEVER, .reg = cpu_cc_dst };
     case CC_OP_MULB ... CC_OP_MULQ:
         return (CCPrepare) { .cond = TCG_COND_NE, .reg = cpu_cc_src };
     default: