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From: aj@suse.de To: gcc-gnats@gcc.gnu.org Subject: target/7396: ix86: cmpgt_ss, cmpge_ss, cmpngt_ss, and cmpnge_ss SSE intriniscs are broken Date: Wed, 24 Jul 2002 12:16:00 -0000 [thread overview] Message-ID: <20020724191009.3796.qmail@sources.redhat.com> (raw) >Number: 7396 >Category: target >Synopsis: ix86: cmpgt_ss, cmpge_ss, cmpngt_ss, and cmpnge_ss SSE intriniscs are broken >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: wrong-code >Submitter-Id: net >Arrival-Date: Wed Jul 24 12:16:01 PDT 2002 >Closed-Date: >Last-Modified: >Originator: Andreas Jaeger >Release: GCC 3.1, GCC 3.2 CVS >Organization: >Environment: i686-linux-gnu >Description: The cmpgt_ss (and also the others) intrinsic copies the value from the wrong argument. The example program outputs: $ ./a.out Return values: -1 6.000000 2.000000 1.000000 Aborted but the correct value is: -1 3.000000 4.000000 1.000000 The last three values should come from m1. Btw. cmplt_ss works correctly, but it seems that the arguments are switched in the intrinsic. >How-To-Repeat: #include <xmmintrin.h> #include <stdlib.h> #include <stdio.h> typedef union { __m128 m; float f[4]; double d[2]; int i[4]; } munion; int test_it (void) { __m128 m1, m2; munion res; m1 = _mm_set_ps (1.0f, 4.0f, 3.0f, 8.0f); m2 = _mm_set_ps (1.0f, 2.0f, 6.0f, 4.0f); res.m = _mm_cmpgt_ss (m1, m2); printf ("Return values: %d %f %f %f\n", res.i[0], res.f[1], res.f[2], res.f[3]); if (res.i[0] != -1) abort (); if (res.f[1] != 3.0f) abort (); if (res.f[2] != 4.0f) abort (); if (res.f[3] != 1.0f) abort (); return 0; } int main (void) { return test_it (); } >Fix: >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2002-07-24 19:16 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-07-24 12:16 aj [this message] 2002-10-15 13:14 hubicka 2002-10-16 10:30 hubicka
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