Re: [COMMITTED] stdlib: Adapt tst-stdbit-builtins.c _BitInt tests on clang

On Mon, Aug 24, 2026 at 04:10:20PM -0300, Adhemerval Zanella Netto wrote:
> On 23/08/26 08:54, Gabriel Ravier wrote:
> > (also, perhaps mildly unrelated but I noticed it while looking at the
> > same file: is `TEST_COMPARE (stdc_bit_floor (((unsigned _BitInt(373))
> > 512) << 242) != (((unsigned _BitInt(512)) 512) << 242), 0);` supposed to
> > have the two sides be different widths ?)
> 
> Hum it makes sense, I am ccing Jakub since he was the one that added this test.

Yes, it is a harmless pasto.
I'll test the following gcc patch soon and glibc, which has a test
based on that test, can be adjusted accordingly.

2026-08-24  Jakub Jelinek  <[email protected]>

	* gcc.dg/builtin-stdc-bit-1.c (main): Fix two pastos.

--- gcc/testsuite/gcc.dg/builtin-stdc-bit-1.c.jj	2026-03-27 10:17:16.877285978 +0100
+++ gcc/testsuite/gcc.dg/builtin-stdc-bit-1.c	2026-08-24 21:21:52.869918087 +0200
@@ -891,7 +891,7 @@ main ()
       || __builtin_stdc_bit_floor (~(unsigned _BitInt(373)) 0) != ((unsigned _BitInt(373)) 1) << (373 - 1))
     __builtin_abort ();
   if (__builtin_stdc_bit_floor (((unsigned _BitInt(512)) 511) << 405) != (((unsigned _BitInt(512)) 256) << 405)
-      || __builtin_stdc_bit_floor (((unsigned _BitInt(373)) 512) << 242) != (((unsigned _BitInt(512)) 512) << 242))
+      || __builtin_stdc_bit_floor (((unsigned _BitInt(373)) 512) << 242) != (((unsigned _BitInt(373)) 512) << 242))
     __builtin_abort ();
   if (__builtin_stdc_bit_ceil ((unsigned _BitInt(512)) 0) != 1
       || !expr_has_type (__builtin_stdc_bit_ceil ((unsigned _BitInt(512)) 0), unsigned _BitInt(512))
@@ -905,7 +905,7 @@ main ()
       || __builtin_stdc_bit_ceil ((~(unsigned _BitInt(373)) 0) >> 1) != ((unsigned _BitInt(373)) 1) << (373 - 1))
     __builtin_abort ();
   if (__builtin_stdc_bit_ceil (((unsigned _BitInt(512)) 512) << 405) != (((unsigned _BitInt(512)) 512) << 405)
-      || __builtin_stdc_bit_ceil (((unsigned _BitInt(373)) 513) << 242) != (((unsigned _BitInt(512)) 1024) << 242))
+      || __builtin_stdc_bit_ceil (((unsigned _BitInt(373)) 513) << 242) != (((unsigned _BitInt(373)) 1024) << 242))
     __builtin_abort ();
   if (__builtin_stdc_bit_floor ((unsigned _BitInt(__BITINT_MAXWIDTH__)) 0) != 0)
     __builtin_abort ();


	Jakub