http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46793
Summary: -fschedule-insns causes ICE in compiling zlib/trees.c
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: changpeng.f...@amd.com
-fschedule-insns causes ICE in compiling zlib/trees.c:
trees.c:701:1: error: unable to find a register to spill in class ‘Q_REGS’
This failure only occurs for -m32 compilation.
To reproduce:
cd trunk/zlib
gcc trees.c -c -o ~/tree.o -O2 -fschedule-insns -m32
[~/gcc-4.6-20101120/zlib]$ gcc trees.c -c -o ~/tree.o -O2 -fschedule-insns -m32
trees.c: In function ‘build_tree’:
trees.c:701:1: error: unable to find a register to spill in class ‘Q_REGS’
trees.c:701:1: error: this is the insn:
(insn 473 429 164 18 (set (subreg:SI (reg:QI 83 [ iftmp.7 ]) 0)
(if_then_else:SI (ltu (reg:CC 17 flags)
(const_int 0 [0]))
(subreg:SI (reg:QI 388) 0)
(subreg:SI (reg:QI 83 [ iftmp.7 ]) 0))) trees.c:677 854
{*movsicc_noc}
(expr_list:REG_DEAD (reg:QI 388)
(expr_list:REG_DEAD (reg:CC 17 flags)
(nil))))
trees.c:701:1: internal compiler error: in spill_failure, at reload1.c:2105
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
This should be a regression (I only know 4.3 is working)
