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Rewrite pg_size_pretty() to avoid compiler bug.

Convert it to use successive shifts right instead of increasing a divisor.This is probably a tad more efficient than the original coding, and it'snicer-looking than the previous patch because we don't need a special caseto avoid overflow in the last branch. But the real reason to do it is toavoid a Solaris compiler bug, as per results from buildfarm member moa.

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src/backend/utils/adt
- dbsize.c

1 file changed

+13

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`‎src/backend/utils/adt/dbsize.c‎`

Lines changed: 13 additions & 19 deletions

Original file line number	Diff line number	Diff line change
`@@ -466,39 +466,33 @@ pg_size_pretty(PG_FUNCTION_ARGS)`
`466`	`466`	`int64size=PG_GETARG_INT64(0);`
`467`	`467`	`charbuf[64];`
`468`	`468`	`int64limit=10*1024;`
`469`		`-int64mult=1;`
	`469`	`+int64limit2=limit*2-1;`
`470`	`470`
`471`		`-if (size<limit*mult)`
	`471`	`+if (size<limit)`
`472`	`472`	`snprintf(buf,sizeof(buf),INT64_FORMAT" bytes",size);`
`473`	`473`	`else`
`474`	`474`	`{`
`475`		`-mult *=1024;`
`476`		`-if (size<limit*mult)`
	`475`	`+size >>=9;/* keep one extra bit for rounding */`
	`476`	`+if (size<limit2)`
`477`	`477`	`snprintf(buf,sizeof(buf),INT64_FORMAT" kB",`
`478`		`- (size+mult /2) /mult);`
	`478`	`+ (size+1) /2);`
`479`	`479`	`else`
`480`	`480`	`{`
`481`		`-mult *=1024;`
`482`		`-if (size<limit*mult)`
	`481`	`+size >>=10;`
	`482`	`+if (size<limit2)`
`483`	`483`	`snprintf(buf,sizeof(buf),INT64_FORMAT" MB",`
`484`		`- (size+mult /2) /mult);`
	`484`	`+ (size+1) /2);`
`485`	`485`	`else`
`486`	`486`	`{`
`487`		`-mult *=1024;`
`488`		`-if (size<limit*mult)`
	`487`	`+size >>=10;`
	`488`	`+if (size<limit2)`
`489`	`489`	`snprintf(buf,sizeof(buf),INT64_FORMAT" GB",`
`490`		`- (size+mult /2) /mult);`
	`490`	`+ (size+1) /2);`
`491`	`491`	`else`
`492`	`492`	`{`
`493`		`-/* Here we have to worry about avoiding overflow */`
`494`		`-int64val;`
`495`		`-`
`496`		`-mult *=1024;`
`497`		`-val=size /mult;`
`498`		`-if ((size %mult) >= (mult /2))`
`499`		`-val++;`
	`493`	`+size >>=10;`
`500`	`494`	`snprintf(buf,sizeof(buf),INT64_FORMAT" TB",`
`501`		`-val);`
	`495`	`+(size+1) /2);`
`502`	`496`	`}`
`503`	`497`	`}`
`504`	`498`	`}`

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Commitfd2e2d0

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`‎src/backend/utils/adt/dbsize.c‎`

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