[LLVMdev] Initial cut at a instruction raising patch

[Richard Pennington]

Hi,

This patch raises selected instructions to function calls. I've dome 
some preliminary testing and I works:

; ModuleID = 'raise.o'
target datalayout = 
"e-p:32:32-i1:8:0-i8:8:0-i16:16:0-i32:32:0-i32:32:0-i64:32:0-f32:32:0-f64:32:0-f96:32:0-v64:64:64-v128:128:0-a0:0"
target triple = "i386-pc-linux-gnu"

define i32 @main(i32, i8**, ...) nounwind {
entry:
         %argc = alloca i32              ; <i32*> [#uses=1]
         store i32 %0, i32* %argc
         %argv = alloca i8**             ; <i8***> [#uses=1]
         store i8** %1, i8*** %argv
         %retval = alloca i32            ; <i32*> [#uses=2]
         store i32 0, i32* %retval
         %ll = alloca i64                ; <i64*> [#uses=3]
         %l = alloca i32         ; <i32*> [#uses=3]
         %2 = load i32* %l               ; <i32> [#uses=1]
         %3 = load i32* %l               ; <i32> [#uses=1]
         %4 = add i32 %2, %3             ; <i32> [#uses=1]
         store i32 %4, i32* %l
         %5 = load i64* %ll              ; <i64> [#uses=1]
         %6 = load i64* %ll              ; <i64> [#uses=1]
         %7 = add i64 %5, %6             ; <i64> [#uses=1]
         store i64 %7, i64* %ll
         br label %return

return:         ; preds = %entry
         %8 = load i32* %retval          ; <i32> [#uses=1]
         ret i32 %8
}

becomes

target datalayout = 
"e-p:32:32-i1:8:0-i8:8:0-i16:16:0-i32:32:0-i32:32:0-i64:32:0-f32:32:0-f64:32:0-f96:32:0-v64:64:64-v128:128:0-a0:0"
target triple = "i386-pc-linux-gnu"

define i32 @main(i32, i8**, ...) nounwind {
entry:
         %argc = alloca i32              ; <i32*> [#uses=1]
         store i32 %0, i32* %argc
         %argv = alloca i8**             ; <i8***> [#uses=1]
         store i8** %1, i8*** %argv
         %retval = alloca i32            ; <i32*> [#uses=2]
         store i32 0, i32* %retval
         %ll = alloca i64                ; <i64*> [#uses=3]
         %l = alloca i32         ; <i32*> [#uses=3]
         %2 = load i32* %l               ; <i32> [#uses=1]
         %3 = load i32* %l               ; <i32> [#uses=1]
         %4 = tail call i32 @addl(i32 %2, i32 %3)                ; <i32> 
[#uses=1]
         store i32 %4, i32* %l
         %5 = load i64* %ll              ; <i64> [#uses=1]
         %6 = load i64* %ll              ; <i64> [#uses=1]
         %7 = tail call i64 @addll(i64 %5, i64 %6)               ; <i64> 
[#uses=1]
         store i64 %7, i64* %ll
         br label %return

return:         ; preds = %entry
         %8 = load i32* %retval          ; <i32> [#uses=1]
         ret i32 %8
}

declare i32 @addl(i32, i32)

declare i64 @addll(i64, i64)

Could you give me any comments/criticisms?

Thanks!

-Rich
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