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...ply makes no sense to me. I wrote a pile of heroics in the addressing mode matching for x86 to specifically work around these obnoxious representations. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20120417/2d224fd3/attachment.html>

Look at this silly function: $ cat small.c unsigned f(unsigned a, unsigned *p) { unsigned x = a/4; p[0] = x; p[1] = x+x; return p[1] - 2*p[0]; } GCC turns this into straightforward code and figures out the 0 return value: shrl $2, %edi movl %edi, (%rsi) addl %edi, %edi movl %edi, 4(%rsi) movl $0, %eax ret LLVM optimizes the code: $ clang -O -S -o- small.c -emit-llvm define i32