llvm-6502/test/Transforms/InstCombine/div.ll
Chris Lattner b2ae9e34db implement PR2328.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51176 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-16 02:59:42 +00:00

85 lines
2.1 KiB
LLVM

; This test makes sure that div instructions are properly eliminated.
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep div
define i32 @test1(i32 %A) {
%B = sdiv i32 %A, 1 ; <i32> [#uses=1]
ret i32 %B
}
define i32 @test2(i32 %A) {
; => Shift
%B = udiv i32 %A, 8 ; <i32> [#uses=1]
ret i32 %B
}
define i32 @test3(i32 %A) {
; => 0, don't need to keep traps
%B = sdiv i32 0, %A ; <i32> [#uses=1]
ret i32 %B
}
define i32 @test4(i32 %A) {
; 0-A
%B = sdiv i32 %A, -1 ; <i32> [#uses=1]
ret i32 %B
}
define i32 @test5(i32 %A) {
%B = udiv i32 %A, -16 ; <i32> [#uses=1]
%C = udiv i32 %B, -4 ; <i32> [#uses=1]
ret i32 %C
}
define i1 @test6(i32 %A) {
%B = udiv i32 %A, 123 ; <i32> [#uses=1]
; A < 123
%C = icmp eq i32 %B, 0 ; <i1> [#uses=1]
ret i1 %C
}
define i1 @test7(i32 %A) {
%B = udiv i32 %A, 10 ; <i32> [#uses=1]
; A >= 20 && A < 30
%C = icmp eq i32 %B, 2 ; <i1> [#uses=1]
ret i1 %C
}
define i1 @test8(i8 %A) {
%B = udiv i8 %A, 123 ; <i8> [#uses=1]
; A >= 246
%C = icmp eq i8 %B, 2 ; <i1> [#uses=1]
ret i1 %C
}
define i1 @test9(i8 %A) {
%B = udiv i8 %A, 123 ; <i8> [#uses=1]
; A < 246
%C = icmp ne i8 %B, 2 ; <i1> [#uses=1]
ret i1 %C
}
define i32 @test10(i32 %X, i1 %C) {
%V = select i1 %C, i32 64, i32 8 ; <i32> [#uses=1]
%R = udiv i32 %X, %V ; <i32> [#uses=1]
ret i32 %R
}
define i32 @test11(i32 %X, i1 %C) {
%A = select i1 %C, i32 1024, i32 32 ; <i32> [#uses=1]
%B = udiv i32 %X, %A ; <i32> [#uses=1]
ret i32 %B
}
; PR2328
define i32 @test12(i32 %x) nounwind {
%tmp3 = udiv i32 %x, %x ; 1
ret i32 %tmp3
}
define i32 @test13(i32 %x) nounwind {
%tmp3 = sdiv i32 %x, %x ; 1
ret i32 %tmp3
}