https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64796
Bug ID: 64796
Summary: effective target bswap64 globally caches
target-specific use of lp64
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: trivial
Priority: P3
Component: testsuite
Assignee: unassigned at gcc dot gnu.org
Reporter: vries at gcc dot gnu.org
1. unix/: supported
$ make -k -j5 -d check-gcc 'RUNTESTFLAGS=dg.exp=optimize-bswapdi-1.c -v -v
--target_board=unix/'
...
Schedule of variations:
unix/
Running target unix/
Running /home/vries/gcc_versions/devel/master/src/gcc/testsuite/gcc.dg/dg.exp
PASS: gcc.dg/optimize-bswapdi-1.c (test for excess errors)
PASS: gcc.dg/optimize-bswapdi-1.c scan-tree-dump-times bswap "64 bit bswap
implementation found at" 3
...
2. unix/-m32: unsupported
$ make -k -j5 -d check-gcc 'RUNTESTFLAGS=dg.exp=optimize-bswapdi-1.c -v -v
--target_board=unix/-m32':
...
Schedule of variations:
unix/-m32
Running target unix/-m32
Running /home/vries/gcc_versions/devel/master/src/gcc/testsuite/gcc.dg/dg.exp
UNSUPPORTED: gcc.dg/optimize-bswapdi-1.c
...
3. unix/ unix/-m32: supported
$ make -k -j5 -d check-gcc 'RUNTESTFLAGS=dg.exp=optimize-bswapdi-1.c -v -v
--target_board=unix/\ unix/-m32'
...
Schedule of variations:
unix/
unix/-m32
Running target unix/
Running /home/vries/gcc_versions/devel/master/src/gcc/testsuite/gcc.dg/dg.exp
PASS: gcc.dg/optimize-bswapdi-1.c (test for excess errors)
PASS: gcc.dg/optimize-bswapdi-1.c scan-tree-dump-times bswap "64 bit bswap
implementation found at" 3
Running target unix/-m32
Running /home/vries/gcc_versions/devel/master/src/gcc/testsuite/gcc.dg/dg.exp
PASS: gcc.dg/optimize-bswapdi-1.c (test for excess errors)
PASS: gcc.dg/optimize-bswapdi-1.c scan-tree-dump-times bswap "64 bit bswap
implementation found at" 3
...
The bswap64 effective target is cached globally, so it caches the
target-specific use of lp64:
...
Return 1 if the target supports 64-bit byte swap instructions.
proc check_effective_target_bswap64 { } {
global et_bswap64_saved
if [info exists et_bswap64_saved] {
verbose "check_effective_target_bswap64: using cached result" 2
} else {
set et_bswap64_saved 0
if { [is-effective-target bswap]
&& [is-effective-target lp64] } {
set et_bswap64_saved 1
}
}
verbose "check_effective_target_bswap64: returning $et_bswap64_saved" 2
return $et_bswap64_saved
}
...
Note that the test passes with -m32, so maybe the effective target bswap64 is
not needed, or the wrong one.
