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LLVM backend for 6502
3baea2951d
This can only occur (I think) through the back-edge of the loop.
However, folding a GEP into itself means that the value of the previous
iteration needs to be stored in the meantime, thus requiring an
additional register variable to be live, but not actually achieving
anything (the gep still needs to be executed once per loop iteration).
The attached test case is derived from:
typedef unsigned uint32;
typedef unsigned char uint8;
inline uint8 *f(uint32 value, uint8 *target) {
while (value >= 0x80) {
value >>= 7;
++target;
}
++target;
return target;
}
uint8 *g(uint32 b, uint8 *target) {
target = f(b, f(42, target));
return target;
}
What happens is that the GEP stored in incptr2 is folded into itself
through the loop's back-edge and the phi-node stored in loopptr,
effectively incrementing the ptr by "2" in each iteration instead of "1".
In this case, it is actually increasing the number of GEPs required as
the GEP before the loop can't be folded away anymore. For comparison:
With this patch:
define i8* @test4(i32 %value, i8* %buffer) {
entry:
%cmp = icmp ugt i32 %value, 127
br i1 %cmp, label %loop.header, label %exit
loop.header: ; preds = %entry
br label %loop.body
loop.body: ; preds = %loop.body, %loop.header
%buffer.pn = phi i8* [ %buffer, %loop.header ], [ %loopptr, %loop.body ]
%newval = phi i32 [ %value, %loop.header ], [ %shr, %loop.body ]
%loopptr = getelementptr inbounds i8, i8* %buffer.pn, i64 1
%shr = lshr i32 %newval, 7
%cmp2 = icmp ugt i32 %newval, 16383
br i1 %cmp2, label %loop.body, label %loop.exit
loop.exit: ; preds = %loop.body
br label %exit
exit: ; preds = %loop.exit, %entry
%0 = phi i8* [ %loopptr, %loop.exit ], [ %buffer, %entry ]
%incptr3 = getelementptr inbounds i8, i8* %0, i64 2
ret i8* %incptr3
}
Without this patch:
define i8* @test4(i32 %value, i8* %buffer) {
entry:
%incptr = getelementptr inbounds i8, i8* %buffer, i64 1
%cmp = icmp ugt i32 %value, 127
br i1 %cmp, label %loop.header, label %exit
loop.header: ; preds = %entry
br label %loop.body
loop.body: ; preds = %loop.body, %loop.header
%0 = phi i8* [ %buffer, %loop.header ], [ %loopptr, %loop.body ]
%loopptr = phi i8* [ %incptr, %loop.header ], [ %incptr2, %loop.body ]
%newval = phi i32 [ %value, %loop.header ], [ %shr, %loop.body ]
%shr = lshr i32 %newval, 7
%incptr2 = getelementptr inbounds i8, i8* %0, i64 2
%cmp2 = icmp ugt i32 %newval, 16383
br i1 %cmp2, label %loop.body, label %loop.exit
loop.exit: ; preds = %loop.body
br label %exit
exit: ; preds = %loop.exit, %entry
%ptr2 = phi i8* [ %incptr2, %loop.exit ], [ %incptr, %entry ]
%incptr3 = getelementptr inbounds i8, i8* %ptr2, i64 1
ret i8* %incptr3
}
Review: http://reviews.llvm.org/D8245
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232718 91177308-0d34-0410-b5e6-96231b3b80d8
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