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target-arm: fix bug in translation of REVSH

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The translation of REVSH shifted the low byte 8 steps left before performing
an 8-bit sign extend, causing this part of the expression to alwas be 0.

Reported-by: Johan Bengtsson <teofrastius@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2010-12-27 19:54:49 +01:00
parent 5697f6ae41
commit 1a855029af
1 changed files with 3 additions and 7 deletions
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10
target-arm/translate.c
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@ -250,13 +250,9 @@ static void gen_rev16(TCGv var)
/* Byteswap low halfword and sign extend. */ /* Byteswap low halfword and sign extend. */
static void gen_revsh(TCGv var) static void gen_revsh(TCGv var)
{ {
TCGv tmp = new_tmp(); tcg_gen_ext16u_i32(var, var);
tcg_gen_shri_i32(tmp, var, 8); tcg_gen_bswap16_i32(var, var);
tcg_gen_andi_i32(tmp, tmp, 0x00ff); tcg_gen_ext16s_i32(var, var);
tcg_gen_shli_i32(var, var, 8);
tcg_gen_ext8s_i32(var, var);
tcg_gen_or_i32(var, var, tmp);
dead_tmp(tmp);
} }
/* Unsigned bitfield extract. */ /* Unsigned bitfield extract. */