https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242067
--- Comment #6 from Dennis Clarke <dcla...@blastwave.org> ---
Merely a follow up here to indicate this problem has been around since
at least r350568 :
root@callisto:/home/dclarke/foo # uname -apKU
FreeBSD callisto 13.0-CURRENT FreeBSD 13.0-CURRENT r350568 QEMU riscv riscv64
1300038 1300038
root@callisto:/home/dclarke/foo #
root@callisto:/home/dclarke/foo # cat pi.c
/*************************************************
* The Open Group Base Specifications Issue 6
* IEEE Std 1003.1, 2004 Edition
*************************************************/
#define _XOPEN_SOURCE 600
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main ( int argc, char *argv[])
{
long double pi128 = 3.1415926535897932384626433832795028841971693993751L;
double pi64 = M_PI;
printf (" the sizeof(pi128) is %i\n", sizeof(pi128) );
printf (" the sizeof(pi64) is %i\n", sizeof(pi64) );
printf ("pi128 may be %44.38Lg\n", pi128 );
printf ("pi64 may be %18.16g\n", pi64 );
return ( EXIT_SUCCESS );
}
root@callisto:/home/dclarke/foo #
root@callisto:/home/dclarke/foo # cat pi.s
.file "pi.c"
.option nopic
.text
.section .rodata
.align 3
.LC2:
.string " the sizeof(pi128) is %i\n"
.align 3
.LC3:
.string " the sizeof(pi64) is %i\n"
.align 3
.LC4:
.string "pi128 may be %44.38Lg\n"
.align 3
.LC5:
.string "pi64 may be %44.38Lg\n"
.text
.align 1
.globl main
.type main, @function
main:
addi sp,sp,-64
sd ra,56(sp)
sd s0,48(sp)
addi s0,sp,64
mv a5,a0
sd a1,-64(s0)
sw a5,-52(s0)
lui a5,%hi(.LC0)
ld a4,%lo(.LC0)(a5)
sd a4,-32(s0)
ld a5,%lo(.LC0+8)(a5)
sd a5,-24(s0)
lui a5,%hi(.LC1)
fld fa5,%lo(.LC1)(a5)
fsd fa5,-40(s0)
li a1,16
lui a5,%hi(.LC2)
addi a0,a5,%lo(.LC2)
call printf
li a1,8
lui a5,%hi(.LC3)
addi a0,a5,%lo(.LC3)
call printf
ld a2,-32(s0)
ld a3,-24(s0)
lui a5,%hi(.LC4)
addi a0,a5,%lo(.LC4)
call printf
ld a1,-40(s0)
lui a5,%hi(.LC5)
addi a0,a5,%lo(.LC5)
call printf
li a5,0
mv a0,a5
ld ra,56(sp)
ld s0,48(sp)
addi sp,sp,64
jr ra
.size main, .-main
.section .rodata
.align 4
.LC0:
.word 3306619320
.word 2221509004
.word 3041149649
.word 1073779231
.align 3
.LC1:
.word 1413754136
.word 1074340347
.ident "GCC: (GNU) 8.2.0"
root@callisto:/home/dclarke/foo #
root@callisto:/home/dclarke/foo #
root@callisto:/home/dclarke/foo # ./pi
the sizeof(pi128) is 16
the sizeof(pi64) is 8
pi128 may be 2.0000076293945362811600603241536472604
pi64 may be 3.141592653589793
root@callisto:/home/dclarke/foo #
root@callisto:/home/dclarke/foo # echo "16o 1074340347p 1413754136pq" | dc
400921FB
54442D18
root@callisto:/home/dclarke/foo # echo "16o 1073779231p 3041149649p 2221509004p
3306619320pq" | dc
4000921F
B54442D1
8469898C
C51701B8
root@callisto:/home/dclarke/foo #
So that is perfect in memory and wrong in output.
--
Dennis Clarke
RISC-V/SPARC/PPC/ARM/CISC
UNIX and Linux spoken
GreyBeard and suspenders optional
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