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tcg/optimize: fix uninitialized variable

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The variables uext_opc and sext_opc are used without initialization if
TCG_TARGET_extract_i{32,64}_valid returns false.  The result, depending
on the compiler, might be the generation of extract and sextract opcodes
with invalid offset and count, or just random data in the TCG opcode
stream.

Fixes: ceb9ee06b7 ("tcg/optimize: Handle TCG_COND_TST{EQ,NE}", 2024-02-03)
Cc: Richard Henderson <pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20240228110641.287205-1-pbonzini@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Paolo Bonzini 2024-02-28 12:06:41 +01:00 committed by Richard Henderson
parent b816e1b5ba
commit ff202817dc
1 changed files with 2 additions and 1 deletions
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tcg/optimize.c
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@ -2102,7 +2102,8 @@ static bool fold_remainder(OptContext *ctx, TCGOp *op)
static void fold_setcond_tst_pow2(OptContext *ctx, TCGOp *op, bool neg)
{
TCGOpcode and_opc, sub_opc, xor_opc, neg_opc, shr_opc, uext_opc, sext_opc;
TCGOpcode and_opc, sub_opc, xor_opc, neg_opc, shr_opc;
TCGOpcode uext_opc = 0, sext_opc = 0;
TCGCond cond = op->args[3];
TCGArg ret, src1, src2;
TCGOp *op2;