diff mbox series

[v2,19/36] tcg: Use TCG_CALL_ARG_EVEN for TCI special case

Message ID 20221021071549.2398137-20-richard.henderson@linaro.org
State Superseded
Headers show
Series tcg: Support for Int128 with helpers | expand

Commit Message

Richard Henderson Oct. 21, 2022, 7:15 a.m. UTC 
Change 32-bit tci TCG_TARGET_CALL_ARG_I32 to TCG_CALL_ARG_EVEN, to
force 32-bit values to be aligned to 64-bit.  With a small reorg
to the argument processing loop, this neatly replaces an ifdef for
CONFIG_TCG_INTERPRETER.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/tci/tcg-target.h |  3 ++-
 tcg/tcg.c            | 62 ++++++++++++++++++++++++++------------------
 2 files changed, 39 insertions(+), 26 deletions(-)

Comments

Ilya Leoshkevich Oct. 25, 2022, 8:14 p.m. UTC | #1 
On Fri, Oct 21, 2022 at 05:15:32PM +1000, Richard Henderson wrote:
> Change 32-bit tci TCG_TARGET_CALL_ARG_I32 to TCG_CALL_ARG_EVEN, to
> force 32-bit values to be aligned to 64-bit.  With a small reorg
> to the argument processing loop, this neatly replaces an ifdef for
> CONFIG_TCG_INTERPRETER.
> 
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>  tcg/tci/tcg-target.h |  3 ++-
>  tcg/tcg.c            | 62 ++++++++++++++++++++++++++------------------
>  2 files changed, 39 insertions(+), 26 deletions(-)

Hi,

This patch breaks s390x-on-s390x emulation:

    s390x$ ./configure --target-list=s390x-linux-user
    s390x$ make -j$(nproc)
    s390x$ make check-tcg
    ...
    TEST    convd on s390x
    ERROR:../tcg/tcg.c:1575:tcg_gen_callN: code should not be reached
 
With the next patch ("tcg: Reorg function calls") the failure is
slightly different:

    TEST    convd on s390x
    timeout: the monitored command dumped core

s390x-on-x86_64 works though.

Best regards,
Ilya
diff mbox series

Patch

diff --git a/tcg/tci/tcg-target.h b/tcg/tci/tcg-target.h
index d6e0450ed8..94ec541b4e 100644
--- a/tcg/tci/tcg-target.h
+++ b/tcg/tci/tcg-target.h
@@ -158,10 +158,11 @@  typedef enum {
 /* Used for function call generation. */
 #define TCG_TARGET_CALL_STACK_OFFSET    0
 #define TCG_TARGET_STACK_ALIGN          8
-#define TCG_TARGET_CALL_ARG_I32         TCG_CALL_ARG_NORMAL
 #if TCG_TARGET_REG_BITS == 32
+# define TCG_TARGET_CALL_ARG_I32        TCG_CALL_ARG_EVEN
 # define TCG_TARGET_CALL_ARG_I64        TCG_CALL_ARG_EVEN
 #else
+# define TCG_TARGET_CALL_ARG_I32        TCG_CALL_ARG_NORMAL
 # define TCG_TARGET_CALL_ARG_I64        TCG_CALL_ARG_NORMAL
 #endif
 
diff --git a/tcg/tcg.c b/tcg/tcg.c
index d4960c62b5..e0f5c6ea7b 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -1532,36 +1532,48 @@  void tcg_gen_callN(void *func, TCGTemp *ret, int nargs, TCGTemp **args)
     real_args = 0;
     for (i = 0; i < nargs; i++) {
         int argtype = extract32(typemask, (i + 1) * 3, 3);
-        bool is_64bit = (argtype & ~1) == dh_typecode_i64;
-        bool want_align = false;
+        TCGCallArgumentKind kind;
+        TCGType type;
 
-#if defined(CONFIG_TCG_INTERPRETER)
-        /*
-         * Align all arguments, so that they land in predictable places
-         * for passing off to ffi_call.
-         */
-        want_align = true;
-#else
-        /* Some targets want aligned 64 bit args */
-        if (is_64bit) {
-            want_align = TCG_TARGET_CALL_ARG_I64 == TCG_CALL_ARG_EVEN;
-        }
-#endif
-
-        if (TCG_TARGET_REG_BITS < 64 && want_align && (real_args & 1)) {
-            op->args[pi++] = TCG_CALL_DUMMY_ARG;
-            real_args++;
+        switch (argtype) {
+        case dh_typecode_i32:
+        case dh_typecode_s32:
+            type = TCG_TYPE_I32;
+            kind = TCG_TARGET_CALL_ARG_I32;
+            break;
+        case dh_typecode_i64:
+        case dh_typecode_s64:
+            type = TCG_TYPE_I64;
+            kind = TCG_TARGET_CALL_ARG_I64;
+            break;
+        case dh_typecode_ptr:
+            type = TCG_TYPE_PTR;
+            kind = TCG_CALL_ARG_NORMAL;
+            break;
+        default:
+            g_assert_not_reached();
         }
 
-        if (TCG_TARGET_REG_BITS < 64 && is_64bit) {
+        switch (kind) {
+        case TCG_CALL_ARG_EVEN:
+            if (real_args & 1) {
+                op->args[pi++] = TCG_CALL_DUMMY_ARG;
+                real_args++;
+            }
+            /* fall through */
+        case TCG_CALL_ARG_NORMAL:
+            if (TCG_TARGET_REG_BITS == 32 && type == TCG_TYPE_I64) {
+                op->args[pi++] = temp_arg(args[i]);
+                op->args[pi++] = temp_arg(args[i] + 1);
+                real_args += 2;
+                break;
+            }
             op->args[pi++] = temp_arg(args[i]);
-            op->args[pi++] = temp_arg(args[i] + 1);
-            real_args += 2;
-            continue;
+            real_args++;
+            break;
+        default:
+            g_assert_not_reached();
         }
-
-        op->args[pi++] = temp_arg(args[i]);
-        real_args++;
     }
     op->args[pi++] = (uintptr_t)func;
     op->args[pi++] = (uintptr_t)info;