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...n time using llvm-gcc and then changing common type to target specific types at code generation time using llc (reconstruct StructLayout). Second, I have been adding two new intrinsic functions as following. 1. "getelement" intrinsic function to load from bitfield of struct type. 2. "setelement" intrinsic function to store to bitfied of struct type. I would like to how do LLVM developers think about above concept. (advices, problems, other solutions etc...) Thanks, Jin-Gu Kang -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org...

...the struct type is pretty much target agnostic. What kind of target-specific structure modifications do you have in mind? > Second, I have been adding two new intrinsic functions as following. > 1. "getelement" intrinsic function to load from bitfield of struct type. > 2. "setelement" intrinsic function to store to bitfied of struct type. Bitfields and unions can make the IR a big mess. Analysing the memory layout of the bitfield is not trivial and the low level bit fiddling you have to do is too big and ugly to be in IR. An instruction that knows that would be beneficial...

...2 @main() nounwind { 11 entry: 12 %retval = alloca i32 ; <i32*> [#uses=1] 13 %a = alloca i32 ; <i32*> [#uses=0] 14 %"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0] 15 call void @llvm.setelement.i2(i8* bitcast (i4* getelementptr (%struct.test* bitcast (%0* @vm to %struct.test*), i32 1, i32 1) to i8*), i2 1) 16 br label %return 17 18 return: ; preds = %entry 19 %retval1 = load i32* %retval ; <i32> [#uses=1] 20 ret...

Ah, but the interesting thing is that they are coming out with a 'clam' version like the 5MX. Details are limited at the moment, but that could mean the combination of 5MX usability with a supported linux distro. I am drooling in anticipation. Sounds like a "I've finally finished my PhD and deserve a treat" situation to me :) Dave On Thu, Mar 06, 2003 at 09:17:20AM