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| author | Joern Rennecke <joern.rennecke@embecosm.com> | 2013-10-01 20:11:58 +0000 |
|---|---|---|
| committer | Joern Rennecke <amylaar@gcc.gnu.org> | 2013-10-01 21:11:58 +0100 |
| commit | f55d4a20747f0a2f6d721e0f19340607f7bb06dc (patch) | |
| tree | 469bfc9969593ad5191eabbb3bd4430af50ea200 /gcc/config/arc | |
| parent | a07c5b47b7843a778474f55d92a3473ae0a6e2ed (diff) | |
| download | gcc-f55d4a20747f0a2f6d721e0f19340607f7bb06dc.zip gcc-f55d4a20747f0a2f6d721e0f19340607f7bb06dc.tar.gz gcc-f55d4a20747f0a2f6d721e0f19340607f7bb06dc.tar.bz2 | |
arc.md: Expand adc_0 comment stating the intended purpose and why it isn't ready.
* 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
Diffstat (limited to 'gcc/config/arc')
| -rw-r--r-- | gcc/config/arc/arc.md | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/gcc/config/arc/arc.md b/gcc/config/arc/arc.md index 37103fe..aa8243a 100644 --- a/gcc/config/arc/arc.md +++ b/gcc/config/arc/arc.md @@ -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") |