diff mbox

[v2,2/2] target-arm: Fix shift by immediate and narrow where src, dest overlap

Message ID 1298284818-16504-3-git-send-email-peter.maydell@linaro.org
State New
Headers show

Commit Message

Peter Maydell Feb. 21, 2011, 10:40 a.m. UTC
For Neon shifts by immediate and narrow, correctly handle the case
where the source registers and the destination registers overlap
(the second pass should use the original register contents, not the
results of the first pass).

This includes a refactoring to pull the size check outside the
loop rather than inside, since there is now very little common
code between the size == 3 and size != 3 case.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target-arm/translate.c |   84 +++++++++++++++++++++++++----------------------
 1 files changed, 45 insertions(+), 39 deletions(-)
diff mbox

Patch

diff --git a/target-arm/translate.c b/target-arm/translate.c
index fa20e84..c859b40 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -4804,64 +4804,70 @@  static int disas_neon_data_insn(CPUState * env, DisasContext *s, uint32_t insn)
 
                 shift = shift - (1 << (size + 3));
                 size++;
-                switch (size) {
-                case 1:
-                    imm = (uint16_t)shift;
-                    imm |= imm << 16;
-                    tmp2 = tcg_const_i32(imm);
-                    TCGV_UNUSED_I64(tmp64);
-                    break;
-                case 2:
-                    imm = (uint32_t)shift;
-                    tmp2 = tcg_const_i32(imm);
-                    TCGV_UNUSED_I64(tmp64);
-                    break;
-                case 3:
+                if (size == 3) {
                     tmp64 = tcg_const_i64(shift);
                     TCGV_UNUSED(tmp2);
-                    break;
-                default:
-                    abort();
-                }
-
-                for (pass = 0; pass < 2; pass++) {
-                    if (size == 3) {
-                        neon_load_reg64(cpu_V0, rm + pass);
+                    neon_load_reg64(cpu_V0, rm);
+                    neon_load_reg64(cpu_V1, rm + 1);
+                    for (pass = 0; pass < 2; pass++) {
+                        TCGv_i64 in;
+                        if (pass == 0) {
+                            in = cpu_V0;
+                        } else {
+                            in = cpu_V1;
+                        }
                         if (q) {
                             if (input_unsigned) {
-                                gen_helper_neon_rshl_u64(cpu_V0, cpu_V0,
-                                                         tmp64);
+                                gen_helper_neon_rshl_u64(cpu_V0, in, tmp64);
                             } else {
-                                gen_helper_neon_rshl_s64(cpu_V0, cpu_V0,
-                                                         tmp64);
+                                gen_helper_neon_rshl_s64(cpu_V0, in, tmp64);
                             }
                         } else {
                             if (input_unsigned) {
-                                gen_helper_neon_shl_u64(cpu_V0, cpu_V0,
-                                                        tmp64);
+                                gen_helper_neon_shl_u64(cpu_V0, in, tmp64);
                             } else {
-                                gen_helper_neon_shl_s64(cpu_V0, cpu_V0,
-                                                        tmp64);
+                                gen_helper_neon_shl_s64(cpu_V0, in, tmp64);
                             }
                         }
+                        tmp = new_tmp();
+                        gen_neon_narrow_op(op == 8, u, size - 1, tmp, cpu_V0);
+                        neon_store_reg(rd, pass, tmp);
+                    } /* for pass */
+                    tcg_temp_free_i64(tmp64);
+                } else {
+                    if (size == 1) {
+                        imm = (uint16_t)shift;
+                        imm |= imm << 16;
                     } else {
-                        tmp = neon_load_reg(rm + pass, 0);
+                        /* size == 2 */
+                        imm = (uint32_t)shift;
+                    }
+                    tmp2 = tcg_const_i32(imm);
+                    TCGV_UNUSED_I64(tmp64);
+                    tmp4 = neon_load_reg(rm + 1, 0);
+                    tmp5 = neon_load_reg(rm + 1, 1);
+                    for (pass = 0; pass < 2; pass++) {
+                        if (pass == 0) {
+                            tmp = neon_load_reg(rm, 0);
+                        } else {
+                            tmp = tmp4;
+                        }
                         gen_neon_shift_narrow(size, tmp, tmp2, q,
                                               input_unsigned);
-                        tmp3 = neon_load_reg(rm + pass, 1);
+                        if (pass == 0) {
+                            tmp3 = neon_load_reg(rm, 1);
+                        } else {
+                            tmp3 = tmp5;
+                        }
                         gen_neon_shift_narrow(size, tmp3, tmp2, q,
                                               input_unsigned);
                         tcg_gen_concat_i32_i64(cpu_V0, tmp, tmp3);
                         dead_tmp(tmp);
                         dead_tmp(tmp3);
-                    }
-                    tmp = new_tmp();
-                    gen_neon_narrow_op(op == 8, u, size - 1, tmp, cpu_V0);
-                    neon_store_reg(rd, pass, tmp);
-                } /* for pass */
-                if (size == 3) {
-                    tcg_temp_free_i64(tmp64);
-                } else {
+                        tmp = new_tmp();
+                        gen_neon_narrow_op(op == 8, u, size - 1, tmp, cpu_V0);
+                        neon_store_reg(rd, pass, tmp);
+                    } /* for pass */
                     tcg_temp_free_i32(tmp2);
                 }
             } else if (op == 10) {