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target-arm: A64: Fix shifts into sign bit 

Fix attempts to shift into the sign bit of an int, which is undefined
behaviour in C and warned about by the clang sanitizer.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1423233250-15853-2-git-send-email-peter.maydell@linaro.org
master
Peter Maydell 2015-02-13 05:46:08 +00:00
parent 5607397027
commit 1743d55c8b
1 changed files with 3 additions and 3 deletions
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6
target-arm/translate-a64.c
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@ -1077,7 +1077,7 @@ static void disas_uncond_b_imm(DisasContext *s, uint32_t insn)
{
uint64_t addr = s->pc + sextract32(insn, 0, 26) * 4 - 4;
if (insn & (1 << 31)) {
if (insn & (1U << 31)) {
/* C5.6.26 BL Branch with link */
tcg_gen_movi_i64(cpu_reg(s, 30), s->pc);
}
@ -1271,7 +1271,7 @@ static void gen_get_nzcv(TCGv_i64 tcg_rt)
TCGv_i32 nzcv = tcg_temp_new_i32();
/* build bit 31, N */
tcg_gen_andi_i32(nzcv, cpu_NF, (1 << 31));
tcg_gen_andi_i32(nzcv, cpu_NF, (1U << 31));
/* build bit 30, Z */
tcg_gen_setcondi_i32(TCG_COND_EQ, tmp, cpu_ZF, 0);
tcg_gen_deposit_i32(nzcv, nzcv, tmp, 30, 1);
@ -1296,7 +1296,7 @@ static void gen_set_nzcv(TCGv_i64 tcg_rt)
tcg_gen_trunc_i64_i32(nzcv, tcg_rt);
/* bit 31, N */
tcg_gen_andi_i32(cpu_NF, nzcv, (1 << 31));
tcg_gen_andi_i32(cpu_NF, nzcv, (1U << 31));
/* bit 30, Z */
tcg_gen_andi_i32(cpu_ZF, nzcv, (1 << 30));
tcg_gen_setcondi_i32(TCG_COND_EQ, cpu_ZF, cpu_ZF, 0);