------- Additional Comments From danglin at gcc dot gnu dot org 2005-09-18
18:59 -------
Seems to occur in gcse1. We have the following rtl after
cse1:
(note 185 10 11 1 NOTE_INSN_LOOP_BEG)
;; Start of basic block 1, registers live: (nil)
(code_label 11 185 12 1 318 "" [1 uses])
(note 12 11 13 1 [bb 1] NOTE_INSN_BASIC_BLOCK)
(call_insn 13 12 14 1 (parallel [
(set (reg:SI 28 %r28)
(call (mem:SI (symbol_ref/v:SI ("@myrnd") [flags 0x83] <function
_decl 7af8ca00 myrnd>) [0 S4 A32])
(const_int 16 [0x10])))
(clobber (reg:SI 1 %r1))
(clobber (reg:SI 2 %r2))
(use (const_int 0 [0x0]))
]) 204 {call_val_symref} (nil)
(expr_list:REG_EH_REGION (const_int 0 [0x0])
(nil))
(nil))
(insn 14 13 15 1 (set (reg:SI 109 [ D.1432 ])
(reg:SI 28 %r28)) 37 {*pa.md:2291} (nil)
(nil))
(insn 15 14 16 1 (set (mem:QI (reg/v/f:SI 98 [ p___4463 ]) [0 S1 A8])
(subreg:QI (reg:SI 109 [ D.1432 ]) 3)) 57 {*pa.md:3028} (nil)
(nil))
(insn 16 15 17 1 (set (reg/v/f:SI 98 [ p___4463 ])
(plus:SI (reg/v/f:SI 98 [ p___4463 ])
(const_int 1 [0x1]))) 108 {addsi3} (nil)
(nil))
(insn 17 16 18 1 (set (reg/f:SI 111)
(plus:SI (reg/v/f:SI 105 [ p ])
(const_int 8 [0x8]))) 108 {addsi3} (nil)
(nil))
(jump_insn 18 17 186 1 (set (pc)
(if_then_else (ne (reg/v/f:SI 98 [ p___4463 ])
(reg/f:SI 111))
(label_ref 11)
(pc))) 25 {*pa.md:1700} (nil)
(expr_list:REG_BR_PROB (const_int 8750 [0x222e])
(nil)))
;; End of basic block 1, registers live:
(nil)
(note 186 18 20 1 NOTE_INSN_LOOP_END)
;; Start of basic block 2, registers live: (nil)
(note 20 186 21 2 [bb 2] NOTE_INSN_BASIC_BLOCK)
(insn 21 20 22 2 (set (reg/f:SI 113)
(high:SI (symbol_ref:SI ("sB") [flags 0x80] <var_decl 7af9bbb0 sB>))) 48
{*pa.md:2737} (nil)
(nil))
(insn 22 21 23 2 (set (reg/f:SI 112)
(lo_sum:SI (reg/f:SI 113)
(symbol_ref:SI ("sB") [flags 0x80] <var_decl 7af9bbb0 sB>))) 51 {*pa
.md:2817} (nil)
(expr_list:REG_EQUAL (symbol_ref:SI ("sB") [flags 0x80] <var_decl 7af9bbb0 s
B>)
(nil)))
(insn 23 22 24 2 (set (reg:SI 114)
(mem/s/j/c:SI (lo_sum:SI (reg/f:SI 113)
(symbol_ref:SI ("sB") [flags 0x80] <var_decl 7af9bbb0 sB>)) [0+0
S4 A32])) 37 {*pa.md:2291} (nil)
(nil))
(insn 24 23 25 2 (set (reg:SI 115)
(const_int 32767 [0x7fff])) 37 {*pa.md:2291} (nil)
(nil))
After gcse1, we have:
(note 185 10 11 1 NOTE_INSN_LOOP_BEG)
;; Start of basic block 1, registers live: (nil)
(code_label 11 185 12 1 318 "" [1 uses])
(note 12 11 13 1 [bb 1] NOTE_INSN_BASIC_BLOCK)
(call_insn 13 12 14 1 (parallel [
(set (reg:SI 28 %r28)
(call (mem:SI (symbol_ref/v:SI ("@myrnd") [flags 0x83] <function
_decl 7af8ca00 myrnd>) [0 S4 A32])
(const_int 16 [0x10])))
(clobber (reg:SI 1 %r1))
(clobber (reg:SI 2 %r2))
(use (const_int 0 [0x0]))
]) 204 {call_val_symref} (nil)
(expr_list:REG_EH_REGION (const_int 0 [0x0])
(nil))
(nil))
(insn 14 13 15 1 (set (reg:SI 109 [ D.1432 ])
(reg:SI 28 %r28)) 37 {*pa.md:2291} (nil)
(nil))
(insn 15 14 16 1 (set (mem:QI (reg/v/f:SI 98 [ p___4463 ]) [0 S1 A8])
(subreg:QI (reg:SI 109 [ D.1432 ]) 3)) 57 {*pa.md:3028} (nil)
(nil))
(insn 16 15 17 1 (set (reg/v/f:SI 98 [ p___4463 ])
(plus:SI (reg/v/f:SI 98 [ p___4463 ])
(const_int 1 [0x1]))) 108 {addsi3} (nil)
(nil))
(insn 17 16 18 1 (set (reg/f:SI 111)
(plus:SI (reg/v/f:SI 105 [ p ])
(const_int 8 [0x8]))) 108 {addsi3} (nil)
(expr_list:REG_EQUAL (const:SI (plus:SI (symbol_ref:SI ("sB") [flags 0x80] <
var_decl 7af9bbb0 sB>)
(const_int 8 [0x8])))
(nil)))
(jump_insn 18 17 186 1 (set (pc)
(if_then_else (ne (reg/v/f:SI 98 [ p___4463 ])
(reg/f:SI 111))
(label_ref 11)
(pc))) 25 {*pa.md:1700} (nil)
(expr_list:REG_BR_PROB (const_int 8750 [0x222e])
(nil)))
;; End of basic block 1, registers live:
(nil)
(note 186 18 20 1 NOTE_INSN_LOOP_END)
;; Start of basic block 2, registers live: (nil)
(note 20 186 21 2 [bb 2] NOTE_INSN_BASIC_BLOCK)
(insn 21 20 22 2 (set (reg/f:SI 113)
(high:SI (symbol_ref:SI ("sB") [flags 0x80] <var_decl 7af9bbb0 sB>))) 48
{*pa.md:2737} (nil)
(nil))
(insn 22 21 23 2 (set (reg/f:SI 112)
(plus:SI (reg/v/f:SI 98 [ p___4463 ])
(const_int -8 [0xfffffff8]))) 108 {addsi3} (nil)
(expr_list:REG_EQUAL (symbol_ref:SI ("sB") [flags 0x80] <var_decl 7af9bbb0 s
B>)
(nil)))
(insn 23 22 25 2 (set (reg:SI 114)
(mem/s/j/c:SI (plus:SI (reg/v/f:SI 98 [ p___4463 ])
(const_int -8 [0xfffffff8])) [0+0 S4 A32])) 37 {*pa.md:2291} (ni
l)
(expr_list:REG_EQUAL (mem/s/j/c:SI (plus:SI (reg/v/f:SI 98 [ p___4463 ])
(const_int -8 [0xfffffff8])) [0+0 S4 A32])
(nil)))
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23954
