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| author |   Juha Riihimäki <juha.riihimaki@nokia.com> | 2009-10-24 15:19:05 +0300 |
|---|---|---|
| committer |   Aurelien Jarno <aurelien@aurel32.net> | 2009-10-27 09:46:26 +0100 |
| commit | ca9a32e4f3da59f07ae2c68df68d1130e02d4665 (patch) | |
| tree | a470f736a4016252b83ea01048604fa44ff29fd0 /target-arm | |
| parent | target-arm: allow modifying vfp fpexc en bit only (diff) | |
| download | qemu-kvm-ca9a32e4f3da59f07ae2c68df68d1130e02d4665.tar.gz qemu-kvm-ca9a32e4f3da59f07ae2c68df68d1130e02d4665.tar.bz2 qemu-kvm-ca9a32e4f3da59f07ae2c68df68d1130e02d4665.zip | |
target-arm: fix neon vsri, vshl and vsli ops
Shift by immediate value is incorrectly overwritten by a temporary
variable in the processing of NEON vsri, vshl and vsli instructions.
This patch has been revised to also include a fix for the special
case where the code would previously try to shift an integer value
over 31 bits left/right.
Signed-off-by: Juha Riihimäki <juha.riihimaki@nokia.com>
Acked-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'target-arm')
| -rw-r--r-- | target-arm/translate.c | 32 |
1 files changed, 18 insertions, 14 deletions
diff --git a/target-arm/translate.c b/target-arm/translate.c index 70cf1b268..ace6c454f 100644 --- a/target-arm/translate.c +++ b/target-arm/translate.c @@ -4096,7 +4096,7 @@ static int disas_neon_data_insn(CPUState * env, DisasContext *s, uint32_t insn) int pairwise; int u; int n; - uint32_t imm; + uint32_t imm, mask; TCGv tmp, tmp2, tmp3, tmp4, tmp5; TCGv_i64 tmp64; @@ -4624,31 +4624,35 @@ static int disas_neon_data_insn(CPUState * env, DisasContext *s, uint32_t insn) switch (size) { case 0: if (op == 4) - imm = 0xff >> -shift; + mask = 0xff >> -shift; else - imm = (uint8_t)(0xff << shift); - imm |= imm << 8; - imm |= imm << 16; + mask = (uint8_t)(0xff << shift); + mask |= mask << 8; + mask |= mask << 16; break; case 1: if (op == 4) - imm = 0xffff >> -shift; + mask = 0xffff >> -shift; else - imm = (uint16_t)(0xffff << shift); - imm |= imm << 16; + mask = (uint16_t)(0xffff << shift); + mask |= mask << 16; break; case 2: - if (op == 4) - imm = 0xffffffffu >> -shift; - else - imm = 0xffffffffu << shift; + if (shift < -31 || shift > 31) { + mask = 0; + } else { + if (op == 4) + mask = 0xffffffffu >> -shift; + else + mask = 0xffffffffu << shift; + } break; default: abort(); } tmp2 = neon_load_reg(rd, pass); - tcg_gen_andi_i32(tmp, tmp, imm); - tcg_gen_andi_i32(tmp2, tmp2, ~imm); + tcg_gen_andi_i32(tmp, tmp, mask); + tcg_gen_andi_i32(tmp2, tmp2, ~mask); tcg_gen_or_i32(tmp, tmp, tmp2); dead_tmp(tmp2); } |