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* [Bug target/112363] New: GCN: 'FAIL: gcc.dg/vect/vect-cond-reduc-in-order-2-signed-zero.c execution test' @ 2023-11-03 7:52 tschwinge at gcc dot gnu.org 2023-11-03 8:42 ` [Bug target/112363] " rdapp at gcc dot gnu.org 2023-11-03 9:31 ` tschwinge at gcc dot gnu.org 0 siblings, 2 replies; 3+ messages in thread From: tschwinge at gcc dot gnu.org @ 2023-11-03 7:52 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112363 Bug ID: 112363 Summary: GCN: 'FAIL: gcc.dg/vect/vect-cond-reduc-in-order-2-signed-zero.c execution test' Product: gcc Version: 14.0 Status: UNCONFIRMED Keywords: testsuite-fail Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: tschwinge at gcc dot gnu.org CC: ams at gcc dot gnu.org, jules at gcc dot gnu.org Target Milestone: --- Target: GCN For GCN target (tested '-march=gfx90a'), the 'gcc.dg/vect/vect-cond-reduc-in-order-2-signed-zero.c' recently added with PR111401 commit r14-5076-g01c18f58d37865d5f3bbe93e666183b54ec608c7 "ifcvt/vect: Emit COND_OP for conditional scalar reduction" FAILs its execution test: '[...]/build-gcc/gcc/gcn-run' './vect-cond-reduc-in-order-2-signed-zero.exe'; echo XYZ$?ZYX GCN Kernel Aborted Kernel aborted XYZ134ZYX OK> Elapsed time: 199 ms FAIL: gcc.dg/vect/vect-cond-reduc-in-order-2-signed-zero.c execution test As that commit and test case does mention "signed zero", maybe that's where the problem lies? ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/112363] GCN: 'FAIL: gcc.dg/vect/vect-cond-reduc-in-order-2-signed-zero.c execution test' 2023-11-03 7:52 [Bug target/112363] New: GCN: 'FAIL: gcc.dg/vect/vect-cond-reduc-in-order-2-signed-zero.c execution test' tschwinge at gcc dot gnu.org @ 2023-11-03 8:42 ` rdapp at gcc dot gnu.org 2023-11-03 9:31 ` tschwinge at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: rdapp at gcc dot gnu.org @ 2023-11-03 8:42 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112363 --- Comment #1 from Robin Dapp <rdapp at gcc dot gnu.org> --- This test was introduced in order to check that we correctly "reduce" with -0.0 as neutral element, i.e. a reduction preserves an intial -0.0 and doesn't turn it into 0.0 by adding 0.0. Kernel aborted means an assertion failed? Or something else? ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/112363] GCN: 'FAIL: gcc.dg/vect/vect-cond-reduc-in-order-2-signed-zero.c execution test' 2023-11-03 7:52 [Bug target/112363] New: GCN: 'FAIL: gcc.dg/vect/vect-cond-reduc-in-order-2-signed-zero.c execution test' tschwinge at gcc dot gnu.org 2023-11-03 8:42 ` [Bug target/112363] " rdapp at gcc dot gnu.org @ 2023-11-03 9:31 ` tschwinge at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: tschwinge at gcc dot gnu.org @ 2023-11-03 9:31 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112363 --- Comment #2 from Thomas Schwinge <tschwinge at gcc dot gnu.org> --- Right, that's what I suspected (see my "signed zero" comment). And indeed, the first check in 'main' instrumented as follows: --- gcc/testsuite/gcc.dg/vect/vect-cond-reduc-in-order-2-signed-zero.c +++ gcc/testsuite/gcc.dg/vect/vect-cond-reduc-in-order-2-signed-zero.c @@ -74,8 +74,11 @@ main () double res4 = reduc_minus_double (a, -0.0, cond1, n); double ref4 = reduc_minus_double_ref (a, -0.0, cond1, n); + __builtin_printf("L0\n"); + __builtin_printf("eq %d, SBres 0x%x, SBref 0x%x\n", res1 == ref1, signbit (res1), signbit (ref1)); if (res1 != ref1 || signbit (res1) != signbit (ref1)) __builtin_abort (); + __builtin_printf("L1\n"); ..., I see: L0 eq 1, SBres 0, SBref 80000000 GCN Kernel Aborted Kernel aborted ..., so unexpected 'signbit' difference of '-0.0' '+' reduction, and thus 'abort'. Thus, likely, a GCN target issue -- for Andrew/Julian to take over. ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-11-03 9:31 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-11-03 7:52 [Bug target/112363] New: GCN: 'FAIL: gcc.dg/vect/vect-cond-reduc-in-order-2-signed-zero.c execution test' tschwinge at gcc dot gnu.org 2023-11-03 8:42 ` [Bug target/112363] " rdapp at gcc dot gnu.org 2023-11-03 9:31 ` tschwinge at gcc dot gnu.org
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