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target-ppc: Fix rlwimi, rlwinm, rlwnm again 

In 63ae0915f8, I arranged to use a 32-bit rotate, without
considering the effect of a mask value that wraps around to
the high bits of the word.

[dwg: In 2e11b15 this was partially fixed, but an edge case was still
incorrect, which this fixes]

Signed-off-by: Richard Henderson <rth@twiddle.net>
[dwg: Folded with a revert of 2e11b15, an earlier buggy version of
 this patch which already went upstream]
Tested-by: Anton Blanchard <anton@samba.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Richard Henderson 2016-06-20 11:03:37 +10:00 committed by David Gibson
parent 7f2b1744b3
commit 820724d170
1 changed files with 1 additions and 3 deletions
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target-ppc/translate.c
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@ -1696,9 +1696,7 @@ static void gen_rlwinm(DisasContext *ctx)
#endif
mask = MASK(mb, me);
if (sh == 0) {
tcg_gen_andi_tl(t_ra, t_rs, mask);
} else if (mask <= 0xffffffffu) {
if (mask <= 0xffffffffu) {
TCGv_i32 t0 = tcg_temp_new_i32();
tcg_gen_trunc_tl_i32(t0, t_rs);
tcg_gen_rotli_i32(t0, t0, sh);