Displaying 1 result from an estimated 1 matches for "word_number_0".
2014 Apr 17
2
[LLVMdev] More Qs about llvm IR to access struct fields
...{i8*}: &struct_member_no_1
%2 = load i8* %1
; 2) Use a byte number:
%3 = getelementptr [ 4 x i8 ]* %STvar i32 0, i32 2 ; {i8*}: &byte_number_2
%4 = load i8* %3
; 3) Use a word number, then shift & mask within:
%5 = getelementptr [ 1 x i32 ]* %STvar i32 0, i32 0 ; {i32*}: &word_number_0
%6 = load i32* %5 ; {i32}: word_number_0
%7 = lshr i32 %6 8 ; {i32}: right_justified
%8 = and i32 %7 0xff ; {i32}: irrelevant_bits_zeroed
Question 1:
Does this choice affect the optimizati...