https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113356
--- Comment #2 from Alex Coplan <acoplan at gcc dot gnu.org> ---
So we have this IR:
insn i8 in bb2 [ebb2] at point 18:
+----------------------------
| 8: [r104:DI++]=r101:DI
| REG_DEAD r101:DI
| REG_INC r104:DI
+----------------------------
has pre/post-modify operations
uses:
use of set r101:i7 (DI pseudo)
use of set r104:i17 (DI pseudo)
appears in a read/write context
defines:
set r104:i8 (DI pseudo)
set by a pre/post-modify
appears in a read/write context
used by insn i13 in bb2 [ebb2] at point 24
set mem:i8
insn i11 in bb2 [ebb2] at point 20:
+------------------------------------------------
| 11: r106:DI=high(const(`_ZTV6Class1'+0x10))
+------------------------------------------------
defines:
set r106:i11 (DI pseudo)
used by insn i12 in bb2 [ebb2] at point 22
insn i12 in bb2 [ebb2] at point 22:
+-------------------------------------------------------
| 12: r105:DI=r106:DI+low(const(`_ZTV6Class1'+0x10))
| REG_DEAD r106:DI
| REG_EQUAL const(`_ZTV6Class1'+0x10)
+-------------------------------------------------------
uses:
use of set r106:i11 (DI pseudo)
defines:
set r105:i12 (DI pseudo)
used by insn i13 in bb2 [ebb2] at point 24
insn i13 in bb2 [ebb2] at point 24:
+----------------------------------------
| 13: [r104:DI]=r105:DI
| REG_DEAD r105:DI
| REG_DEAD r104:DI
| REG_EH_REGION 0xffffffffffffffff
+----------------------------------------
uses:
use of set r104:i8 (DI pseudo)
appears inside an address
use of set r105:i12 (DI pseudo)
defines:
set mem:i13
used by phi node mem:a7 in ebb1 at point 30
and we're trying to form (8,13). i8 has i13 as a hazard due to the writeback
dataflow and i13 has i12 as a hazard (due to the initial fix for non-call
exceptions introducing a hazard on the previous nondebug insn). I wonder if it
would be enough to get i
