[PATCH] i386: Fix up ix86_md_asm_adjust for TImode [PR98086]

[Jakub Jelinek via Gcc-patches]

Hi!

ix86_md_asm_adjust right above this code uses:
      machine_mode dest_mode = GET_MODE (dest);
      if (!SCALAR_INT_MODE_P (dest_mode))
        {
          error ("invalid type for %<asm%> flag output");
          continue;
        }
but then assumes that dest_mode can be only [QHSD]Imode and nothing else.

The following patch handles TImode and hypothetically even wider modes
by handling it like DImode for 32-bit.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2020-12-03  Jakub Jelinek  <ja...@redhat.com>

        PR target/98086
        * config/i386/i386.c (ix86_md_asm_adjust): Use dest_mode DImode
        or SImode for modes wider than DImode.  If dest_mode isn't SImode
        or GET_MODE (dest) isn't DImode, use convert_to_mode.

        * gcc.target/i386/pr98086.c: New test.

--- gcc/config/i386/i386.c.jj   2020-11-18 09:40:09.498664422 +0100
+++ gcc/config/i386/i386.c      2020-12-02 15:33:26.224184113 +0100
@@ -21508,6 +21508,8 @@ ix86_md_asm_adjust (vec<rtx> &outputs, v
          continue;
        }
 
+      if (GET_MODE_BITSIZE (dest_mode) > GET_MODE_BITSIZE (DImode))
+       dest_mode = DImode;
       if (dest_mode == DImode && !TARGET_64BIT)
        dest_mode = SImode;
 
@@ -21534,10 +21536,16 @@ ix86_md_asm_adjust (vec<rtx> &outputs, v
 
       if (dest_mode != GET_MODE (dest))
        {
-         rtx tmp = gen_reg_rtx (SImode);
+         rtx tmp = gen_reg_rtx (dest_mode);
 
          emit_insn (gen_rtx_SET (tmp, x));
-         emit_insn (gen_zero_extendsidi2 (dest, tmp));
+         if (dest_mode == SImode && GET_MODE (dest) == DImode)
+           emit_insn (gen_zero_extendsidi2 (dest, tmp));
+         else
+           {
+             tmp = convert_to_mode (GET_MODE (dest), tmp, 1);
+             emit_insn (gen_rtx_SET (dest, tmp));
+           }
        }
       else
        emit_insn (gen_rtx_SET (dest, x));
--- gcc/testsuite/gcc.target/i386/pr98086.c.jj  2020-12-02 15:36:40.858951118 
+0100
+++ gcc/testsuite/gcc.target/i386/pr98086.c     2020-12-02 15:37:27.305406401 
+0100
@@ -0,0 +1,10 @@
+/* PR target/98086 */
+/* { dg-do compile { target int128 } } */
+
+__int128_t x;
+
+void
+foo (void)
+{
+  __asm ("" : "=@ccc" (x));
+}

        Jakub