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add uadd_ov/usub_ov to apint, consolidate constant folding

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logic to use the new APInt methods.  Among other things this
implements rdar://8501501 - llvm.smul.with.overflow.i32 should constant fold

which comes from "clang -ftrapv", originally brought to my attention from PR8221.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116457 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-10-14 00:05:07 +00:00
parent 08e90f5646
commit eafc5cb80d
4 changed files with 54 additions and 35 deletions
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test/Transforms/ConstProp/overflow-ops.ll
+11
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@@ -170,3 +170,14 @@ declare {i8, i1} @llvm.usub.with.overflow.i8(i8, i8)
declare {i8, i1} @llvm.sadd.with.overflow.i8(i8, i8)
declare {i8, i1} @llvm.ssub.with.overflow.i8(i8, i8)
declare {i8, i1} @llvm.smul.with.overflow.i8(i8, i8)
; rdar://8501501
define {i8, i1} @smul_1() nounwind {
entry:
%t = call {i8, i1} @llvm.smul.with.overflow.i8(i8 -20, i8 -10)
ret {i8, i1} %t
; CHECK: @smul_1
; CHECK: ret %i8i1 { i8 -56, i1 true }
}