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target/arm: Use ror32 instead of open-coding the operation

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The helper function is more documentary, and also already
handles the case of rotate by zero.

Backports commit dd861b3f29be97a9e3cdb9769dcbc0c7d7825185 from qemu
This commit is contained in:
Richard Henderson 2019-11-18 20:25:49 -05:00 committed by Lioncash
parent df4c773ed2
commit 751ab7b24b
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 2 additions and 5 deletions
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7
qemu/target/arm/translate.c
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@ -8147,8 +8147,7 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
/* CPSR = immediate */
val = insn & 0xff;
shift = ((insn >> 8) & 0xf) * 2;
if (shift)
val = (val >> shift) | (val << (32 - shift));
val = ror32(val, shift);
i = ((insn & (1 << 22)) != 0);
if (gen_set_psr_im(s, msr_mask(s, (insn >> 16) & 0xf, i),
i, val)) {
@ -8411,9 +8410,7 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
/* immediate operand */
val = insn & 0xff;
shift = ((insn >> 8) & 0xf) * 2;
if (shift) {
val = (val >> shift) | (val << (32 - shift));
}
val = ror32(val, shift);
tmp2 = tcg_temp_new_i32(tcg_ctx);
tcg_gen_movi_i32(tcg_ctx, tmp2, val);
if (logic_cc && shift) {