Re: CVS commit: src/tests/lib/libc/locale

[Martin Husemann <martin%duskware.de@localhost>]

On Wed, Nov 29, 2017 at 06:12:02AM +0000, Taylor R Campbell wrote:
> (My guess is that there's something screwy with i387 long doubles, but
> I don't have a good guess about where that screwiness might be
> happening without single-stepping through it.)

My blame is on qemu.

I added the missing printf of diff to your test program.

I tested on two real i386 machines, one running netbsd-7 (gcc 4.8.5)
and get:

str -12345.678900
exp -0x1.81cd6e631f8a1p+13 -1.23456789000000008e+04
act -0x1.81cd6e631f8a1p+13 -1.23456789000000008e+04
diff 0x0p+0 0.00000000000000000e+00


and on -current (gcc 5.5.0) I get:

str -12345.678900
exp -0x1.81cd6e631f8a1p+13 -1.23456789000000008e+04
act -0x1.81cd6e631f8a1p+13 -1.23456789000000008e+04
diff 0x0p+0 0.00000000000000000e+00


The CPUs identify as:

for the netbsd-7-1 machine:

cpu0: highest basic info 0000000a
cpu0: highest extended info 80000008
cpu0: "Intel(R) Atom(TM) CPU D525   @ 1.80GHz"
cpu0: Intel 45nm Atom Family (686-class), 1800.03 MHz
cpu0: family 0x6 model 0x1c stepping 0xa (id 0x106ca)
cpu0: features 0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE>
cpu0: features 0xbfebfbff<MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2>
cpu0: features 0xbfebfbff<SS,HTT,TM,SBF>
cpu0: features1 0x40e31d<SSE3,DTES64,MONITOR,DS-CPL,TM2,SSSE3,CX16,xTPR,PDCM>
cpu0: features1 0x40e31d<MOVBE>
cpu0: features2 0x20100000<XD,EM64T>
cpu0: features3 0x1<LAHF>
cpu0: I-cache 32KB 64B/line 8-way, D-cache 24KB 64B/line 6-way
cpu0: L2 cache 512KB 64B/line 8-way
cpu0: ITLB 32 4KB entries fully associative
cpu0: DTLB 64 4KB entries 4-way, 4K/4M: 8 entries
cpu0: Initial APIC ID 2
cpu0: Cluster/Package ID 0
cpu0: Core ID 1
cpu0: SMT ID 0
cpu0: DSPM-eax 0x1<DTS>
cpu0: DSPM-ecx 0x1<HWF>
cpu0: SEF highest subleaf 00000000
cpu0: microcode version 0x107, platform ID 3


and for the -current machine:

cpu0: highest basic info 00000002
cpu0: highest extended info 80000004
cpu0: "Intel(R) Pentium(R) 4 CPU 2.60GHz"
cpu0: Intel Pentium 4 (686-class), 2593.65 MHz
cpu0: family 0xf model 0x2 stepping 0x9 (id 0xf29)
cpu0: features 0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE>
cpu0: features 0xbfebfbff<MCA,CMOV,PAT,PSE36,CLFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2>
cpu0: features 0xbfebfbff<SS,HTT,TM,SBF>
cpu0: features1 0x4400<CID,xTPR>
cpu0: I-cache 12K uOp cache 8-way, D-cache 8KB 64B/line 4-way
cpu0: L2 cache 512KB 64B/line 8-way
cpu0: ITLB 4K/4M: 64 entries
cpu0: DTLB 4K/4M: 64 entries
cpu0: Initial APIC ID 1
cpu0: Cluster/Package ID 0
cpu0: SMT ID 1
cpu0: microcode version 0x11, platform ID 2


I also ran the gcc 4.5 produced binary on a xen DOMU machine and
get the same results as native.

Martin