commit 6effbc703b711779a196e5dbaf6335f39fab71c2
Author: hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Tue Jan 16 11:19:51 2018 +0000

    HJ patch #4

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 9dffd02f..e73389b 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -14497,6 +14497,7 @@ put_condition_code (enum rtx_code code, enum machine_mode mode, bool reverse,
    If CODE is 'h', pretend the reg is the 'high' byte register.
    If CODE is 'y', print "st(0)" instead of "st", if the reg is stack op.
    If CODE is 'd', duplicate the operand for AVX instruction.
+   If CODE is 'V', print naked full integer register name without %.
  */
 
 void
@@ -14506,7 +14507,7 @@ print_reg (rtx x, int code, FILE *file)
   unsigned int regno;
   bool duplicated = code == 'd' && TARGET_AVX;
 
-  if (ASSEMBLER_DIALECT == ASM_ATT)
+  if (ASSEMBLER_DIALECT == ASM_ATT && code != 'V')
     putc ('%', file);
 
   if (x == pc_rtx)
@@ -14542,6 +14543,14 @@ print_reg (rtx x, int code, FILE *file)
   else
     code = GET_MODE_SIZE (GET_MODE (x));
 
+  if (code == 'V')
+    {
+      if (GENERAL_REGNO_P (regno))
+	code = GET_MODE_SIZE (word_mode);
+      else
+	error ("'V' modifier on non-integer register");
+    }
+
   /* Irritatingly, AMD extended registers use different naming convention
      from the normal registers: "r%d[bwd]"  */
   if (REX_INT_REGNO_P (regno))
@@ -14695,6 +14704,7 @@ get_some_local_dynamic_name (void)
    & -- print some in-use local-dynamic symbol name.
    H -- print a memory address offset by 8; used for sse high-parts
    Y -- print condition for XOP pcom* instruction.
+   V -- print naked full integer register name without %.
    + -- print a branch hint as 'cs' or 'ds' prefix
    ; -- print a semicolon (after prefixes due to bug in older gas).
    ~ -- print "i" if TARGET_AVX2, "f" otherwise.
@@ -14919,6 +14929,7 @@ ix86_print_operand (FILE *file, rtx x, int code)
 	case 'X':
 	case 'P':
 	case 'p':
+	case 'V':
 	  break;
 
 	case 's':
diff --git a/gcc/testsuite/gcc.target/i386/indirect-thunk-register-4.c b/gcc/testsuite/gcc.target/i386/indirect-thunk-register-4.c
new file mode 100644
index 0000000..f0cd9b7
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/indirect-thunk-register-4.c
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mindirect-branch=keep -fno-pic" } */
+
+extern void (*func_p) (void);
+
+void
+foo (void)
+{
+  asm("call __x86_indirect_thunk_%V0" : : "a" (func_p));
+}
+
+/* { dg-final { scan-assembler "call\[ \t\]*__x86_indirect_thunk_eax" { target ia32 } } } */
+/* { dg-final { scan-assembler "call\[ \t\]*__x86_indirect_thunk_rax" { target { ! ia32 } } } } */