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| author | Jakub Jelinek <jakub@redhat.com> | 2009-05-29 19:00:35 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2009-05-29 19:00:35 +0200 |
| commit | a0987204c590c4ae170268eb4e17c07925bb456c (patch) | |
| tree | 40dc69a2e7fb164daa1ce5100f5aa441129080e1 /gcc/config | |
| parent | 725fd454ae7e5a40356d5b27660b77d1bb6c55e9 (diff) | |
| download | gcc-a0987204c590c4ae170268eb4e17c07925bb456c.zip gcc-a0987204c590c4ae170268eb4e17c07925bb456c.tar.gz gcc-a0987204c590c4ae170268eb4e17c07925bb456c.tar.bz2 | |
i386.c (ix86_decompose_address): Avoid useless 0 displacement.
* config/i386/i386.c (ix86_decompose_address): Avoid useless
0 displacement. Add 0 displacement if base is %[er]bp or %r13.
From-SVN: r147982
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/i386/i386.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 26bb300..8a98334 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -8900,6 +8900,10 @@ ix86_decompose_address (rtx addr, struct ix86_address *out) base_reg = base && GET_CODE (base) == SUBREG ? SUBREG_REG (base) : base; index_reg = index && GET_CODE (index) == SUBREG ? SUBREG_REG (index) : index; + /* Avoid useless 0 displacement. */ + if (disp == const0_rtx && (base || index)) + disp = NULL_RTX; + /* Allow arg pointer and stack pointer as index if there is not scaling. */ if (base_reg && index_reg && scale == 1 && (index_reg == arg_pointer_rtx @@ -8911,10 +8915,16 @@ ix86_decompose_address (rtx addr, struct ix86_address *out) tmp = base_reg, base_reg = index_reg, index_reg = tmp; } - /* Special case: %ebp cannot be encoded as a base without a displacement. */ - if ((base_reg == hard_frame_pointer_rtx - || base_reg == frame_pointer_rtx - || base_reg == arg_pointer_rtx) && !disp) + /* Special case: %ebp cannot be encoded as a base without a displacement. + Similarly %r13. */ + if (!disp + && base_reg + && (base_reg == hard_frame_pointer_rtx + || base_reg == frame_pointer_rtx + || base_reg == arg_pointer_rtx + || (REG_P (base_reg) + && (REGNO (base_reg) == HARD_FRAME_POINTER_REGNUM + || REGNO (base_reg) == R13_REG)))) disp = const0_rtx; /* Special case: on K6, [%esi] makes the instruction vector decoded. @@ -8928,7 +8938,7 @@ ix86_decompose_address (rtx addr, struct ix86_address *out) disp = const0_rtx; /* Special case: encode reg+reg instead of reg*2. */ - if (!base && index && scale && scale == 2) + if (!base && index && scale == 2) base = index, base_reg = index_reg, scale = 1; /* Special case: scaling cannot be encoded without base or displacement. */ |