diff options
Diffstat (limited to 'gcc/config/i386')
| -rw-r--r-- | gcc/config/i386/i386-protos.h | 3 | ||||
| -rw-r--r-- | gcc/config/i386/i386.c | 59 | ||||
| -rw-r--r-- | gcc/config/i386/i386.h | 11 |
3 files changed, 72 insertions, 1 deletions
diff --git a/gcc/config/i386/i386-protos.h b/gcc/config/i386/i386-protos.h index 630112f625d..f300a56834d 100644 --- a/gcc/config/i386/i386-protos.h +++ b/gcc/config/i386/i386-protos.h @@ -65,7 +65,8 @@ extern bool ix86_expand_strlen (rtx, rtx, rtx, rtx); extern bool constant_address_p (rtx); extern bool legitimate_pic_operand_p (rtx); extern bool legitimate_pic_address_disp_p (rtx); - +extern bool ix86_legitimize_reload_address (rtx, enum machine_mode, + int, int, int); extern void print_reg (rtx, int, FILE*); extern void ix86_print_operand (FILE *, rtx, int); diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index a21f2da95b7..18172a10825 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -47,6 +47,7 @@ along with GCC; see the file COPYING3. If not see #include "target-def.h" #include "common/common-target.h" #include "langhooks.h" +#include "reload.h" #include "cgraph.h" #include "gimple.h" #include "dwarf2.h" @@ -12010,6 +12011,64 @@ legitimate_pic_address_disp_p (rtx disp) return false; } +/* Our implementation of LEGITIMIZE_RELOAD_ADDRESS. Returns a value to + replace the input X, or the original X if no replacement is called for. + The output parameter *WIN is 1 if the calling macro should goto WIN, + 0 if it should not. */ + +bool +ix86_legitimize_reload_address (rtx x, + enum machine_mode mode ATTRIBUTE_UNUSED, + int opnum, int type, + int ind_levels ATTRIBUTE_UNUSED) +{ + /* Reload can generate: + + (plus:DI (plus:DI (unspec:DI [(const_int 0 [0])] UNSPEC_TP) + (reg:DI 97)) + (reg:DI 2 cx)) + + This RTX is rejected from ix86_legitimate_address_p due to + non-strictness of base register 97. Following this rejection, + reload pushes all three components into separate registers, + creating invalid memory address RTX. + + Following code reloads only the invalid part of the + memory address RTX. */ + + if (GET_CODE (x) == PLUS + && REG_P (XEXP (x, 1)) + && GET_CODE (XEXP (x, 0)) == PLUS + && REG_P (XEXP (XEXP (x, 0), 1))) + { + rtx base, index; + bool something_reloaded = false; + + base = XEXP (XEXP (x, 0), 1); + if (!REG_OK_FOR_BASE_STRICT_P (base)) + { + push_reload (base, NULL_RTX, &XEXP (XEXP (x, 0), 1), NULL, + BASE_REG_CLASS, GET_MODE (x), VOIDmode, 0, 0, + opnum, (enum reload_type) type); + something_reloaded = true; + } + + index = XEXP (x, 1); + if (!REG_OK_FOR_INDEX_STRICT_P (index)) + { + push_reload (index, NULL_RTX, &XEXP (x, 1), NULL, + INDEX_REG_CLASS, GET_MODE (x), VOIDmode, 0, 0, + opnum, (enum reload_type) type); + something_reloaded = true; + } + + gcc_assert (something_reloaded); + return true; + } + + return false; +} + /* Recognizes RTL expressions that are valid memory addresses for an instruction. The MODE argument is the machine mode for the MEM expression that wants to use this address. diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h index 3fcd2093e36..a53c70a31dc 100644 --- a/gcc/config/i386/i386.h +++ b/gcc/config/i386/i386.h @@ -1630,6 +1630,17 @@ typedef struct ix86_args { #define CONSTANT_ADDRESS_P(X) constant_address_p (X) +/* Try a machine-dependent way of reloading an illegitimate address + operand. If we find one, push the reload and jump to WIN. This + macro is used in only one place: `find_reloads_address' in reload.c. */ + +#define LEGITIMIZE_RELOAD_ADDRESS(X, MODE, OPNUM, TYPE, INDL, WIN) \ +do { \ + if (ix86_legitimize_reload_address ((X), (MODE), (OPNUM), \ + (int)(TYPE), (INDL))) \ + goto WIN; \ +} while (0) + /* If defined, a C expression to determine the base term of address X. This macro is used in only one place: `find_base_term' in alias.c. |