Mercurial > hg > tinycc
changeset 401:2707893d0c57
Fix from David Heine for tcc typecast sign extension bug. For details, see
http://lists.gnu.org/archive/html/tinycc-devel/2005-01/msg00013.html
| author | landley@driftwood |
|---|---|
| date | Sun, 08 Oct 2006 12:24:42 -0400 |
| parents | afda44bbf76b |
| children | 7e9800049711 |
| files | tcc.c tcctest.c |
| diffstat | 2 files changed, 15 insertions(+), 0 deletions(-) [+] |
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--- a/tcc.c Sun Oct 08 01:13:34 2006 -0400 +++ b/tcc.c Sun Oct 08 12:24:42 2006 -0400 @@ -5754,6 +5754,11 @@ bits = 32 - bits; vpushi(bits); gen_op(TOK_SHL); + /* result must be signed or the SAR is converted to an SHL + This was not the case when "t" was a signed short + and the last value on the stack was an unsigned int + */ + vtop->type.t &= (~VT_UNSIGNED); vpushi(bits); gen_op(TOK_SAR); }
--- a/tcctest.c Sun Oct 08 01:13:34 2006 -0400 +++ b/tcctest.c Sun Oct 08 12:24:42 2006 -0400 @@ -1066,6 +1066,8 @@ int a; char c; char tab[10]; + unsigned b,c; + short s; printf("cast_test:\n"); a = 0xfffff; @@ -1089,6 +1091,14 @@ printf("sizeof(c) = %d, sizeof((int)c) = %d\n", sizeof(c), sizeof((int)c)); + /* test cast from unsigned to signed short to int */ + b = 0xf000; + d = (short)b; + printf("((unsigned)(short)0x%08x) = 0x%08x\n", b, d); + b = 0xf0f0; + d = (char)b; + printf("((unsigned)(char)0x%08x) = 0x%08x\n", b, d); + /* test implicit int casting for array accesses */ c = 0; tab[1] = 2;