stormy-abi: Document abi changes.
* config/stormy16/stormy-abi: Document abi changes. * config/stormy16/stormy16.h (REG_ALLOC_ORDER): Redefine. (ICALL_REGS): New register class. (NUM_ARGUMENT_REGISTERS): Now 6. (DEFAULT_PCC_STRUCT_RETURN): Don't try to return structs in registers. (REG_CLASS_FROM_LETTER): Map 'z' to ICALL_REGS. * config/stormy16.md (call_internal, call_value_internal, indirect_jump): Use new 'z' constraint. From-SVN: r46041
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2001-10-05 Catherine Moore <clm@redhat.com>
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* config/stormy16/stormy-abi: Document abi changes.
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* config/stormy16/stormy16.h (REG_ALLOC_ORDER): Redefine.
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(ICALL_REGS): New register class.
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(NUM_ARGUMENT_REGISTERS): Now 6.
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(DEFAULT_PCC_STRUCT_RETURN): Don't try to return structs
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in registers.
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(REG_CLASS_FROM_LETTER): Map 'z' to ICALL_REGS.
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* config/stormy16.md (call_internal, call_value_internal,
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indirect_jump): Use new 'z' constraint.
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2001-10-05 Neil Booth <neil@daikokuya.demon.co.uk>
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* doc/cppinternals.texi: Update.
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@ -24,17 +24,19 @@ The registers are allocated as follows:
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Register Purpose
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-------------------------------------------------------------------
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r0, r1 Call-volatile. May be changed during the execution
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r0, r1 Call-volatile. May be changed during the execution
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of a call instruction.
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r2 through r7 Argument passing; call-clobbered.
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r8, r9 Call-volatile. May be changed during the execution
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of a call instruction.
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r2 through r9 Argument passing; call-clobbered.
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r10 through r13 Call-saved.
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r14 Program status word.
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r15 Stack pointer.
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The return value of a procedure is returned in r2-r9 if it fits,
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otherwise a pointer is passed as a `hidden' first argument
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and the return value is placed there.
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Scalar values are returned in register r2-r7 if the value fits.
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Otherwise, a pointer is passed as a 'hidden' first argument and
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the return value is placed there.
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Arguments are passed in registers starting in r2, then on the stack.
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Arguments of size not a multiple of a word are padded to whole words.
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@ -83,20 +85,18 @@ count += N;
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One implementation of this is if a variadic function first
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pushes registers 2 through 9 in sequence at entry, and
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pushes registers 2 through 7 in sequence at entry, and
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sets 'base' to the address of the first word pushed,
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producing a stack that appears like:
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SP ->
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[other data]
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r9
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r8
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r7
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r6
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r5
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r4
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r3
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count-> r2
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count-> r2
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Return address (two words)
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9th procedure parameter word
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10th procedure parameter word
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@ -1043,7 +1043,7 @@ do { \
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only sequences of consecutive registers. On such machines, define
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`REG_ALLOC_ORDER' to be an initializer that lists the highest numbered
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allocatable register first. */
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#define REG_ALLOC_ORDER { 9, 7, 6, 5, 4, 3, 8, 2, 1, 0, 10, 11, 12, 13, 14, 15, 16 }
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#define REG_ALLOC_ORDER { 7, 6, 5, 4, 3, 2, 1, 0, 9, 8, 10, 11, 12, 13, 14, 15, 16 }
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/* A C statement (sans semicolon) to choose the order in which to allocate hard
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registers for pseudo-registers local to a basic block.
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@ -1204,6 +1204,7 @@ enum reg_class
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R2_REGS,
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EIGHT_REGS,
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R8_REGS,
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ICALL_REGS,
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GENERAL_REGS,
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CARRY_REGS,
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ALL_REGS,
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@ -1226,6 +1227,7 @@ enum reg_class
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"R2_REGS", \
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"EIGHT_REGS", \
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"R8_REGS", \
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"ICALL_REGS", \
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"GENERAL_REGS", \
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"CARRY_REGS", \
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"ALL_REGS" \
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@ -1250,6 +1252,7 @@ enum reg_class
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0x00004, \
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0x000FF, \
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0x00100, \
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0x00300, \
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0x6FFFF, \
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0x10000, \
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(1 << FIRST_PSEUDO_REGISTER) - 1 \
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@ -1303,6 +1306,7 @@ enum reg_class
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: (CHAR) == 'e' ? EIGHT_REGS \
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: (CHAR) == 't' ? TWO_REGS \
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: (CHAR) == 'y' ? CARRY_REGS \
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: (CHAR) == 'z' ? ICALL_REGS \
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: NO_REGS)
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/* A C expression which is nonzero if register number NUM is suitable for use
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@ -2007,7 +2011,7 @@ enum reg_class
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/* Function Arguments in Registers */
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#define NUM_ARGUMENT_REGISTERS 8
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#define NUM_ARGUMENT_REGISTERS 6
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#define FIRST_ARGUMENT_REGISTER 2
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#define STORMY16_WORD_SIZE(TYPE, MODE) \
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return values are decided by the `RETURN_IN_MEMORY' macro.
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If not defined, this defaults to the value 1. */
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#define DEFAULT_PCC_STRUCT_RETURN 0
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/* #define DEFAULT_PCC_STRUCT_RETURN 0 */
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/* If the structure value address is passed in a register, then
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`STRUCT_VALUE_REGNUM' should be the number of that register. */
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@ -822,7 +822,7 @@
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(define_insn "*call_internal"
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[(call (mem:HI (match_operand:HI 0 "nonmemory_operand" "i,r"))
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(match_operand 1 "" ""))
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(use (match_operand:HI 2 "nonmemory_operand" "X,t"))]
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(use (match_operand:HI 2 "nonmemory_operand" "X,z"))]
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""
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"@
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callf %C0
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[(set (match_operand 3 "register_operand" "=r,r")
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(call (mem:HI (match_operand:HI 0 "nonmemory_operand" "i,r"))
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(match_operand 1 "" "")))
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(use (match_operand:HI 2 "nonmemory_operand" "X,t"))]
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(use (match_operand:HI 2 "nonmemory_operand" "X,z"))]
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""
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"@
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callf %C0
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(define_insn ""
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[(set (pc) (match_operand:HI 0 "register_operand" "r"))
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(use (match_operand:HI 1 "register_operand" "t"))]
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(use (match_operand:HI 1 "register_operand" "z"))]
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""
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"jmp %1,%0"
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[(set_attr "length" "4")
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