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arc.md: Expand adc_0 comment stating the intended purpose and why it isn't ready.

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* config/arc/arc.md: Expand adc_0 comment stating the intended
        purpose and why it isn't ready.
        Replace commented out call_value_via_label_mixed with a
        plain comment about bl_s.

Co-Authored-By: Diego Novillo <dnovillo@google.com>

From-SVN: r203085
This commit is contained in:
Joern Rennecke 2013-10-01 20:11:58 +00:00 • committed by Joern Rennecke
parent a07c5b47b7
commit f55d4a2074
2 changed files with 10 additions and 9 deletions
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5
gcc/ChangeLog
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@ -9,6 +9,11 @@
* doc/extend.texi (long_call/medium_call/short_call): Typo fix.
(__builtin_arc_aligned): Likewise.
* config/arc/arc.md: Expand adc_0 comment stating the intended
purpose and why it isn't ready.
Replace commented out call_value_via_label_mixed with a
plain comment about bl_s.
2013-10-01 Joern Rennecke <joern.rennecke@embecosm.com>
* config/arc/arc.c (arc_conditional_register_usage):

14
gcc/config/arc/arc.md
View file

@ -2394,6 +2394,8 @@
(set (match_dup 0)
(plus:SI (match_dup 1) (match_dup 2)))])])
; ??? need to delve into combine to find out why this is not useful.
; We'd like to be able to grok various C idioms for carry bit usage.
;(define_insn "*adc_0"
; [(set (match_operand:SI 0 "dest_reg_operand" "=w")
; (plus:SI (ltu:SI (reg:CC_C CC_REG) (const_int 0))
@ -3850,16 +3852,10 @@
(set_attr "predicable" "no,no,yes,yes,no,yes,no,yes")
(set_attr "length" "*,*,4,4,4,4,4,8")])
; There is a bl_s instruction (16 bit opcode branch-and-link), but we can't
; use it for lack of inter-procedural branch shortening.
; Link-time relaxation would help...
;; TODO - supporting 16-bit short "branch and link" insns if required.
;(define_insn "*call_value_via_label_mixed"
; [(set (match_operand 0 "register_operand" "=r")
; (call (mem:SI (match_operand:SI 1 "call_address_operand" ""))
; (match_operand 2 "" "")))
; (clobber (reg:SI 31))]
; "TARGET_MIXED_CODE"
; "bl_s %1"
; [(set_attr "type" "call")])
(define_insn "call_value_prof"
[(set (match_operand 0 "dest_reg_operand" "=r,r")