https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90000
Bug ID: 90000
Summary: Compile-time hog w/ impossible asm constraints on
powerpc
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: compile-time-hog, error-recovery
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
Target: powerpc-*-linux-gnu
At least gcc-9.0.0-alpha20190331 snapshot (r270048) and gcc 8.2 take indefinite
time when compiling gcc/testsuite/gcc.target/powerpc/pr60032.c w/ -msoft-float:
% timeout 60 powerpc-e300c3-linux-gnu-gcc-9.0.0-alpha20190331 -msoft-float -c
gcc/testsuite/gcc.target/powerpc/pr60032.c
gcc/testsuite/gcc.target/powerpc/pr60032.c: In function 'foo':
gcc/testsuite/gcc.target/powerpc/pr60032.c:10:3: error: impossible constraint
in 'asm'
10 | __asm__ ("#" : "=d" (fr1));
| ^~~~~~~
gcc/testsuite/gcc.target/powerpc/pr60032.c:13:1: error: 31 cannot be used in
asm here
13 | }
| ^
gcc/testsuite/gcc.target/powerpc/pr60032.c:13:1: error: 31 cannot be used in
asm here
zsh: exit 124 timeout 60 powerpc-e300c3-linux-gnu-gcc-9.0.0-alpha20190331
-msoft-float -c
13.18% cc1 [.] note_stores
12.19% cc1 [.] rtx_equal_p
7.99% cc1 [.] set_of_1
7.72% cc1 [.] rs6000_stack_info
7.51% cc1 [.] process_bb_lives
7.26% cc1 [.] set_of
4.27% cc1 [.] refers_to_regno_p
4.18% cc1 [.] update_reg_eliminate
4.10% cc1 [.] reg_overlap_mentioned_p
3.74% cc1 [.] find_regno_note
3.14% cc1 [.] lra_assign
2.80% cc1 [.] lra_create_live_ranges_1
2.80% cc1 [.] resize_reg_info
2.73% cc1 [.] bitmap_bit_p
2.15% cc1 [.] lra_constraints
1.96% cc1 [.] lra_spill
It actually might be a duplicate of some existing PR. I believe the case of LRA
doing some unnecessary work after an unrecoverable error has been reported
already, though I cannot easily find where.
