Messages in this thread | | | From | "Ulrich Windl" <> | Date | Fri, 29 Dec 2000 10:54:38 +0100 | Subject | i386: gcc & asm(): wrong constraint for "mull" |
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Hello,
I noticed (with some inspiration from Andy Kleen) that some asm() instructions for the ia32 use the "g" constraint for "mull", where my Intel 386 Assembly Language Manual suggests the "MUL" instruction needs an r/m operand. So I guess the correct constraint is "rm" in gcc, and not "g". That change identical assembly output for gcc-2.95.2, but some gcc-2.96.x will try a multiplication with an immediate (constant) operand for the "g" constarint, and the as will choke on that. (Redhat 7.0 ships such a version of gcc).
As I won't be online next week, let me say regards and a good new year to all!
Ulrich
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