llvm dev - Aug 2013 - [LLVMdev] Case sensitive .macros for llvm-mc and arithmetic in expressions

I have come across some assembly that assumes macro names are not case 
sensitive.  My first reaction is to have the user fix the code until I 
found out that gas .macro names are not case sensitive.

While this isn't the exact code, it is representative of the problem:
#---
              .macro  sUm from=0, to=5
              .long   \from
              .if     \to-\from
              sum     "(\from+1)",\to
              .endif
              .endm

sum 0, 5
#---
Results in the following error:
   sum.s:9:1: error: invalid operand for instruction
   sum 0, 5

I have attached a patch that might be all that is needed to fix case 
sensitivity.

In another case there is an expression like this:
#---
.Ltmp1:
.long 0xdeadbeef
.Ltmp7:
.long 0xdeadbeef
.Ltmp22:
	.long	(.Ltmp7-.Ltmp1) - .Ltmp22
#---
The above results in this error:
   LLVM ERROR: expected relocatable expression

The above seems like it should work, and if .Ltmp22 is replaced by a 
number it does.

-- 
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