bswap-fold.ll   [plain text]

; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep ret | count 6
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep call.*bswap

define i1 @test1(i16 %tmp2) {
        %tmp10 = call i16 @llvm.bswap.i16( i16 %tmp2 )          ; <i16> [#uses=1]
        %tmp = icmp eq i16 %tmp10, 1            ; <i1> [#uses=1]
        ret i1 %tmp
}

define i1 @test2(i32 %tmp) {
        %tmp34 = tail call i32 @llvm.bswap.i32( i32 %tmp )              ; <i32> [#uses=1]
        %tmp.upgrd.1 = icmp eq i32 %tmp34, 1            ; <i1> [#uses=1]
        ret i1 %tmp.upgrd.1
}

declare i32 @llvm.bswap.i32(i32)

define i1 @test3(i64 %tmp) {
        %tmp34 = tail call i64 @llvm.bswap.i64( i64 %tmp )              ; <i64> [#uses=1]
        %tmp.upgrd.2 = icmp eq i64 %tmp34, 1            ; <i1> [#uses=1]
        ret i1 %tmp.upgrd.2
}

declare i64 @llvm.bswap.i64(i64)

declare i16 @llvm.bswap.i16(i16)

; rdar://5992453
; A & 255
define i32 @test4(i32 %a) nounwind  {
entry:
	%tmp2 = tail call i32 @llvm.bswap.i32( i32 %a )	
	%tmp4 = lshr i32 %tmp2, 24
	ret i32 %tmp4
}

; A
define i32 @test5(i32 %a) nounwind  {
entry:
	%tmp2 = tail call i32 @llvm.bswap.i32( i32 %a )
	%tmp4 = tail call i32 @llvm.bswap.i32( i32 %tmp2 )
	ret i32 %tmp4
}

; a >> 24
define i32 @test6(i32 %a) nounwind  {
entry:
	%tmp2 = tail call i32 @llvm.bswap.i32( i32 %a )	
	%tmp4 = and i32 %tmp2, 255
	ret i32 %tmp4
}