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54 lines
1.3 KiB
Diff
54 lines
1.3 KiB
Diff
# DP: 2004-09-26 Roger Sayle <roger@eyesopen.com>
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# DP:
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# DP: PR other/15526
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# DP: Backport from mainline
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# DP: 2004-05-20 Falk Hueffner <falk@debian.org>
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# DP: * libgcc2.c (__mulvsi3): Fix overflow test.
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diff -u -r1.170.6.1 -r1.170.6.2
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--- gcc/gcc/libgcc2.c 2004/07/17 21:18:47 1.170.6.1
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+++ gcc/gcc/libgcc2.c 2004/09/26 20:47:14 1.170.6.2
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@@ -130,9 +130,7 @@
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{
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const DWtype w = (DWtype) a * (DWtype) b;
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- if (((a >= 0) == (b >= 0))
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- ? (UDWtype) w > (UDWtype) (((DWtype) 1 << (WORD_SIZE - 1)) - 1)
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- : (UDWtype) w < (UDWtype) ((DWtype) -1 << (WORD_SIZE - 1)))
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+ if ((Wtype) (w >> WORD_SIZE) != (Wtype) w >> (WORD_SIZE - 1))
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abort ();
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return w;
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/cvs/gcc/gcc/gcc/testsuite/gcc.dg/ftrapv-1.c,v --> standard output
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revision 1.1.22.1
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--- gcc/gcc/testsuite/gcc.dg/ftrapv-1.c
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+++ /dev/null 2004-10-15 06:22:06.980596000 +0000
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@@ -0,0 +1,25 @@
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+/* Copyright (C) 2004 Free Software Foundation.
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+
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+ PR other/15526
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+ Verify correct overflow checking with -ftrapv.
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+
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+ Written by Falk Hueffner, 20th May 2004. */
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+
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+/* { dg-do run } */
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+/* { dg-options "-ftrapv" } */
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+
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+__attribute__((noinline)) int
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+mulv(int a, int b)
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+{
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+ return a * b;
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+}
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+
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+int
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+main()
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+{
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+ mulv( 0, 0);
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+ mulv( 0, -1);
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+ mulv(-1, 0);
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+ mulv(-1, -1);
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+ return 0;
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+}
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