Turn CANNOT_CHANGE_MODE_CLASS into a hook

This also seemed like a good opportunity to reverse the sense of the
hook to "can", to avoid the awkward double negative in !CANNOT.

2017-09-15  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayard  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* target.def (can_change_mode_class): New hook.
	(mode_rep_extended): Refer to it instead of CANNOT_CHANGE_MODE_CLASS.
	(hard_regno_nregs): Likewise.
	* hooks.h (hook_bool_mode_mode_reg_class_t_true): Declare.
	* hooks.c (hook_bool_mode_mode_reg_class_t_true): New function.
	* doc/tm.texi.in (CANNOT_CHANGE_MODE_CLASS): Replace with...
	(TARGET_CAN_CHANGE_MODE_CLASS): ...this.
	(LOAD_EXTEND_OP): Update accordingly.
	* doc/tm.texi: Regenerate.
	* doc/rtl.texi: Refer to TARGET_CAN_CHANGE_MODE_CLASS instead of
	CANNOT_CHANGE_MODE_CLASS.
	* hard-reg-set.h (REG_CANNOT_CHANGE_MODE_P): Replace with...
	(REG_CAN_CHANGE_MODE_P): ...this new macro.
	* combine.c (simplify_set): Update accordingly.
	* emit-rtl.c (validate_subreg): Likewise.
	* recog.c (general_operand): Likewise.
	* regcprop.c (mode_change_ok): Likewise.
	* reload1.c (choose_reload_regs): Likewise.
	(inherit_piecemeal_p): Likewise.
	* rtlanal.c (simplify_subreg_regno): Likewise.
	* postreload.c (reload_cse_simplify_set): Use REG_CAN_CHANGE_MODE_P
	instead of CANNOT_CHANGE_MODE_CLASS.
	(reload_cse_simplify_operands): Likewise.
	* reload.c (push_reload): Use targetm.can_change_mode_class
	instead of CANNOT_CHANGE_MODE_CLASS.
	(push_reload): Likewise.  Also use REG_CAN_CHANGE_MODE_P instead of
	REG_CANNOT_CHANGE_MODE_P.
	* config/alpha/alpha.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/alpha/alpha.c (alpha_can_change_mode_class): New function.
	(TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	* config/arm/arm.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/arm/arm.c (TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	(arm_can_change_mode_class): New function.
	* config/arm/neon.md: Refer to TARGET_CAN_CHANGE_MODE_CLASS rather
	than CANNOT_CHANGE_MODE_CLASS in comments.
	* config/i386/i386.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/i386/i386-protos.h (ix86_cannot_change_mode_class): Delete.
	* config/i386/i386.c (ix86_cannot_change_mode_class): Replace with...
	(ix86_can_change_mode_class): ...this new function, inverting the
	sense of the return value.
	(TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	* config/ia64/ia64.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/ia64/ia64.c (TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	(ia64_can_change_mode_class): New function.
	* config/m32c/m32c.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/m32c/m32c-protos.h (m32c_cannot_change_mode_class): Delete.
	* config/m32c/m32c.c (m32c_cannot_change_mode_class): Replace with...
	(m32c_can_change_mode_class): ...this new function, inverting the
	sense of the return value.
	(TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	* config/mips/mips.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/mips/mips-protos.h (mips_cannot_change_mode_class): Delete.
	* config/mips/mips.c (mips_cannot_change_mode_class): Replace with...
	(mips_can_change_mode_class): ...this new function, inverting the
	sense of the return value.
	(TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	* config/msp430/msp430.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/msp430/msp430.c (TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	(msp430_can_change_mode_class): New function.
	* config/nvptx/nvptx.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/nvptx/nvptx.c (nvptx_can_change_mode_class): New function.
	(TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	* config/pa/pa32-regs.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/pa/pa64-regs.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/pa/pa-protos.h (pa_cannot_change_mode_class): Delete.
	* config/pa/pa.c (TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	(pa_cannot_change_mode_class): Replace with...
	(pa_can_change_mode_class): ...this new function, inverting the
	sense of the return value.
	(pa_modes_tieable_p): Refer to TARGET_CAN_CHANGE_MODE_CLASS rather
	than CANNOT_CHANGE_MODE_CLASS in comments.
	* config/pdp11/pdp11.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/pdp11/pdp11-protos.h (pdp11_cannot_change_mode_class): Delete.
	* config/pdp11/pdp11.c (TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	(pdp11_cannot_change_mode_class): Replace with...
	(pdp11_can_change_mode_class): ...this new function, inverting the
	sense of the return value.
	* config/powerpcspe/powerpcspe.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/powerpcspe/powerpcspe-protos.h
	(rs6000_cannot_change_mode_class_ptr): Delete.
	* config/powerpcspe/powerpcspe.c
	(rs6000_cannot_change_mode_class_ptr): Delete.
	(TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	(rs6000_option_override_internal): Assign to
	targetm.can_change_mode_class instead of
	rs6000_cannot_change_mode_class_ptr.
	(rs6000_cannot_change_mode_class): Replace with...
	(rs6000_can_change_mode_class): ...this new function, inverting the
	sense of the return value.
	(rs6000_debug_cannot_change_mode_class): Replace with...
	(rs6000_debug_can_change_mode_class): ...this new function.
	* config/riscv/riscv.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/riscv/riscv.c (riscv_can_change_mode_class): New function.
	(TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	* config/rs6000/rs6000.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/rs6000/rs6000-protos.h (rs6000_cannot_change_mode_class_ptr):
	Delete.
	* config/rs6000/rs6000.c (rs6000_cannot_change_mode_class_ptr): Delete.
	(TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	(rs6000_option_override_internal): Assign to
	targetm.can_change_mode_class instead of
	rs6000_cannot_change_mode_class_ptr.
	(rs6000_cannot_change_mode_class): Replace with...
	(rs6000_can_change_mode_class): ...this new function, inverting the
	sense of the return value.
	(rs6000_debug_cannot_change_mode_class): Replace with...
	(rs6000_debug_can_change_mode_class): ...this new function.
	* config/s390/s390.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/s390/s390-protos.h (s390_cannot_change_mode_class): Delete.
	* config/s390/s390.c (s390_cannot_change_mode_class): Replace with...
	(s390_can_change_mode_class): ...this new function, inverting the
	sense of the return value.
	(TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	* config/sh/sh.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/sh/sh-protos.h (sh_cannot_change_mode_class): Delete.
	* config/sh/sh.c (TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	(sh_cannot_change_mode_class): Replace with...
	(sh_can_change_mode_class): ...this new function, inverting the
	sense of the return value.
	* config/sparc/sparc.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/sparc/sparc.c (TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	(sparc_can_change_mode_class): New function.
	* config/spu/spu.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/spu/spu.c (spu_can_change_mode_class): New function.
	(TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	* config/visium/visium.h (CANNOT_CHANGE_MODE_CLASS): Delete.
	* config/visium/visium.c (TARGET_CAN_CHANGE_MODE_CLASS): Redefine.
	(visium_can_change_mode_class): New function.
	* system.h (CANNOT_CHANGE_MODE_CLASS): Poison.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>

From-SVN: r252816

2 files changed, 11 insertions, 3 deletions

diff --git a/gcc/config/riscv/riscv.c b/gcc/config/riscv/riscv.c
index c6390aa..42ddac9 100644
--- a/gcc/config/riscv/riscv.c
+++ b/gcc/config/riscv/riscv.c
@@ -3987,6 +3987,14 @@ riscv_slow_unaligned_access (machine_mode, unsigned int)
   return riscv_slow_unaligned_access_p;
 }
 
+/* Implement TARGET_CAN_CHANGE_MODE_CLASS.  */
+
+static bool
+riscv_can_change_mode_class (machine_mode, machine_mode, reg_class_t rclass)
+{
+  return !reg_classes_intersect_p (FP_REGS, rclass);
+}
+
 /* Initialize the GCC target structure.  */
 #undef TARGET_ASM_ALIGNED_HI_OP
 #define TARGET_ASM_ALIGNED_HI_OP "\t.half\t"
@@ -4131,6 +4139,9 @@ riscv_slow_unaligned_access (machine_mode, unsigned int)
 #undef TARGET_SECONDARY_MEMORY_NEEDED
 #define TARGET_SECONDARY_MEMORY_NEEDED riscv_secondary_memory_needed
 
+#undef TARGET_CAN_CHANGE_MODE_CLASS
+#define TARGET_CAN_CHANGE_MODE_CLASS riscv_can_change_mode_class
+
 struct gcc_target targetm = TARGET_INITIALIZER;
 
 #include "gt-riscv.h"
diff --git a/gcc/config/riscv/riscv.h b/gcc/config/riscv/riscv.h
index 0a5ae40..53141bc 100644
--- a/gcc/config/riscv/riscv.h
+++ b/gcc/config/riscv/riscv.h
@@ -456,9 +456,6 @@ enum reg_class
   (((VALUE) | ((1UL<<31) - IMM_REACH)) == ((1UL<<31) - IMM_REACH)	\
    || ((VALUE) | ((1UL<<31) - IMM_REACH)) + IMM_REACH == 0)
 
-#define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS) \
-  reg_classes_intersect_p (FP_REGS, CLASS)
-
 /* Stack layout; function entry, exit and calling.  */
 
 #define STACK_GROWS_DOWNWARD 1