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teach the optimizer how to constant fold uadd/usub intrinsics.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83295 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-10-05 05:26:04 +00:00
parent d0806a1519
commit e65cd40ab9
2 changed files with 82 additions and 1 deletions
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53
test/Transforms/ConstProp/overflow-ops.ll Normal file
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; RUN: opt < %s -constprop -S | FileCheck %s
%i8i1 = type {i8, i1}
;;-----------------------------
;; uadd
;;-----------------------------
define {i8, i1} @uadd_1() nounwind {
entry:
%t = call {i8, i1} @llvm.uadd.with.overflow.i8(i8 42, i8 100)
ret {i8, i1} %t
; CHECK: @uadd_1
; CHECK: ret %i8i1 { i8 -114, i1 false }
}
define {i8, i1} @uadd_2() nounwind {
entry:
%t = call {i8, i1} @llvm.uadd.with.overflow.i8(i8 142, i8 120)
ret {i8, i1} %t
; CHECK: @uadd_2
; CHECK: ret %i8i1 { i8 6, i1 true }
}
;;-----------------------------
;; usub
;;-----------------------------
define {i8, i1} @usub_1() nounwind {
entry:
%t = call {i8, i1} @llvm.usub.with.overflow.i8(i8 4, i8 2)
ret {i8, i1} %t
; CHECK: @usub_1
; CHECK: ret %i8i1 { i8 2, i1 false }
}
define {i8, i1} @usub_2() nounwind {
entry:
%t = call {i8, i1} @llvm.usub.with.overflow.i8(i8 4, i8 6)
ret {i8, i1} %t
; CHECK: @usub_2
; CHECK: ret %i8i1 { i8 -2, i1 true }
}
declare {i8, i1} @llvm.uadd.with.overflow.i8(i8, i8)
declare {i8, i1} @llvm.usub.with.overflow.i8(i8, i8)