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[SLSR] handles off bounds GEPs

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Summary:
The old requirement on GEP candidates being in bounds is unnecessary.
For off-bound GEPs, we still have

  &B[i * S] = B + (i * S) * e = B + (i * e) * S

Test Plan: slsr_offbound_gep in slsr-gep.ll

Reviewers: meheff

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8809

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233949 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jingyue Wu
2015-04-02 21:18:32 +00:00
parent df4fd4fc4e
commit 6dedfc073a
2 changed files with 37 additions and 5 deletions
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25
test/Transforms/StraightLineStrengthReduce/slsr-gep.ll
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@@ -107,3 +107,28 @@ define i64 @slsr_gep_uglygep([10 x [5 x %struct.S]]* %input, i64 %s, i64 %t) {
%2 = add i64 %1, %v2
ret i64 %2
}
define i32 @slsr_out_of_bounds_gep(i32* %input, i32 %s) {
; CHECK-LABEL: @slsr_out_of_bounds_gep(
; v0 = input[0];
%p0 = getelementptr i32, i32* %input, i64 0
%v0 = load i32, i32* %p0
; v1 = input[(long)s];
%t = sext i32 %s to i64
%p1 = getelementptr i32, i32* %input, i64 %t
; CHECK: %p1 = getelementptr i32, i32* %input, i64 %t
%v1 = load i32, i32* %p1
; v2 = input[(long)(s * 2)];
%s2 = mul nsw i32 %s, 2
%t2 = sext i32 %s2 to i64
%p2 = getelementptr i32, i32* %input, i64 %t2
; CHECK: %p2 = getelementptr i32, i32* %p1, i64 %t
%v2 = load i32, i32* %p2
; return v0 + v1 + v2;
%1 = add i32 %v0, %v1
%2 = add i32 %1, %v2
ret i32 %2
}