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of operations that provably don't overflow. For example, we can prove
%civ.inc below does not sign-overflow. With this change,
IndVarSimplify changes %civ.inc to an add nsw.
define i32 @foo(i32* %array, i32* %length_ptr, i32 %init) {
entry:
%length = load i32* %length_ptr, !range !0
%len.sub.1 = sub i32 %length, 1
%upper = icmp slt i32 %init, %len.sub.1
br i1 %upper, label %loop, label %exit
loop:
%civ = phi i32 [ %init, %entry ], [ %civ.inc, %latch ]
%civ.inc = add i32 %civ, 1
%cmp = icmp slt i32 %civ.inc, %length
br i1 %cmp, label %latch, label %break
latch:
store i32 0, i32* %array
%check = icmp slt i32 %civ.inc, %len.sub.1
br i1 %check, label %loop, label %break
break:
ret i32 %civ.inc
exit:
ret i32 42
}
Differential Revision: http://reviews.llvm.org/D6748
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225282 91177308-0d34-0410-b5e6-96231b3b80d8
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|---|---|---|
| .. | ||
| X86 | ||
| xcore | ||
| cycle.ll | ||
| func-alias.ll | ||
| ld1.ll | ||
| lit.local.cfg | ||
| loop1.ll | ||
| mem-op-depth.ll | ||
| metadata.ll | ||
| no-ldstr-conn.ll | ||
| req-depth.ll | ||
| search-limit.ll | ||
| simple3.ll | ||
| simple-int.ll | ||
| simple-ldstr-ptrs.ll | ||
| simple-ldstr.ll | ||
| simple-sel.ll | ||
| simple-tst.ll | ||
| simple.ll | ||