On Sun, Sep 24, 2017 at 11:25:34AM +0200, Uros Bizjak wrote:
> We can use 'q' modifier just before register output part (plus a small
> simplification).
>
> Can you try the attached (untested) patch?
>
> Uros.
> Index: i386.c
> ===================================================================
> --- i386.c (revision 253118)
> +++ i386.c (working copy)
> @@ -19953,6 +19953,14 @@ ix86_print_operand_address_as (FILE *file, rtx add
> code = 'k';
> }
>
> + /* Since the upper 32 bits of RSP are always zero for x32, we can
> + encode %esp as %rsp to avoid 0x67 prefix if there is no index or
> + base register. */
> + if (TARGET_X32 && Pmode == SImode
> + && ((!index && base && REGNO (base) == SP_REG)
> + || (!base && index && REGNO (index) == SP_REG)))
> + code = 'q';
> +
> if (ASSEMBLER_DIALECT == ASM_ATT)
> {
> if (disp)
This broke
+FAIL: gcc.target/i386/pr55049-1.c (internal compiler error)
+FAIL: gcc.target/i386/pr55049-1.c (test for excess errors)
+FAIL: gcc.target/i386/pr59034-1.c (internal compiler error)
+FAIL: gcc.target/i386/pr59034-1.c (test for excess errors)
+FAIL: g++.dg/other/pr59492.C -std=gnu++11 (internal compiler error)
+FAIL: g++.dg/other/pr59492.C -std=gnu++11 (test for excess errors)
+FAIL: g++.dg/other/pr59492.C -std=gnu++14 (internal compiler error)
+FAIL: g++.dg/other/pr59492.C -std=gnu++14 (test for excess errors)
+FAIL: g++.dg/other/pr59492.C -std=gnu++98 (internal compiler error)
+FAIL: g++.dg/other/pr59492.C -std=gnu++98 (test for excess errors)
with --enable-checking=yes,rtl,extra.
While I believe non-NULL index must be a REG, that is not the case for base,
which can be pc_rtx. A few lines later it calls print_reg on base and/or
index (if non-NULL) and that assumes it is pc_rtx or uses REGNO on it,
so I think we can't see a SUBREG or something similar there.
Fixed thusly, ok for trunk?
2017-09-26 Jakub Jelinek <ja...@redhat.com>
PR target/82267
* config/i386/i386.c (ix86_print_operand_address_as): Only test
REGNO (base) == SP_REG if base is a REG.
--- gcc/config/i386/i386.c.jj 2017-09-26 11:38:54.000000000 +0200
+++ gcc/config/i386/i386.c 2017-09-26 14:04:51.444459554 +0200
@@ -19957,7 +19957,7 @@ ix86_print_operand_address_as (FILE *fil
encode %esp as %rsp to avoid 0x67 prefix if there is no index or
base register. */
if (TARGET_X32 && Pmode == SImode
- && ((!index && base && REGNO (base) == SP_REG)
+ && ((!index && base && REG_P (base) && REGNO (base) == SP_REG)
|| (!base && index && REGNO (index) == SP_REG)))
code = 'q';
Jakub
