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llvm-mirror/test/CodeGen/ARM/mvn.ll
Quentin Colombet 337e6e6d1f During SelectionDAG building explicitly set a node to constant zero when the
value is zero.
This allows optmizations to kick in more easily.
Fix some test cases so that they remain meaningful (i.e., not completely dead
coded) when optimizations apply.

<rdar://problem/14096009> superfluous multiply by high part of zero-extended
value.

llvm-svn: 184222
2013-06-18 20:14:39 +00:00

75 lines
1.6 KiB
LLVM

; RUN: llc < %s -march=arm | grep mvn | count 9
define i32 @f1() {
entry:
ret i32 -1
}
define i32 @f2(i32 %a) {
entry:
%tmpnot = xor i32 %a, -1 ; <i32> [#uses=1]
ret i32 %tmpnot
}
define i32 @f3(i32 %a) {
entry:
%tmp1 = shl i32 %a, 2 ; <i32> [#uses=1]
%tmp1not = xor i32 %tmp1, -1 ; <i32> [#uses=1]
ret i32 %tmp1not
}
define i32 @f4(i32 %a, i8 %b) {
entry:
%shift.upgrd.1 = zext i8 %b to i32 ; <i32> [#uses=1]
%tmp3 = shl i32 %a, %shift.upgrd.1 ; <i32> [#uses=1]
%tmp3not = xor i32 %tmp3, -1 ; <i32> [#uses=1]
ret i32 %tmp3not
}
define i32 @f5(i32 %a) {
entry:
%tmp1 = lshr i32 %a, 2 ; <i32> [#uses=1]
%tmp1not = xor i32 %tmp1, -1 ; <i32> [#uses=1]
ret i32 %tmp1not
}
define i32 @f6(i32 %a, i8 %b) {
entry:
%shift.upgrd.2 = zext i8 %b to i32 ; <i32> [#uses=1]
%tmp2 = lshr i32 %a, %shift.upgrd.2 ; <i32> [#uses=1]
%tmp2not = xor i32 %tmp2, -1 ; <i32> [#uses=1]
ret i32 %tmp2not
}
define i32 @f7(i32 %a) {
entry:
%tmp1 = ashr i32 %a, 2 ; <i32> [#uses=1]
%tmp1not = xor i32 %tmp1, -1 ; <i32> [#uses=1]
ret i32 %tmp1not
}
define i32 @f8(i32 %a, i8 %b) {
entry:
%shift.upgrd.3 = zext i8 %b to i32 ; <i32> [#uses=1]
%tmp3 = ashr i32 %a, %shift.upgrd.3 ; <i32> [#uses=1]
%tmp3not = xor i32 %tmp3, -1 ; <i32> [#uses=1]
ret i32 %tmp3not
}
define i32 @f9() {
entry:
%tmp4845 = add i32 0, 0 ; <i32> [#uses=1]
br label %cond_true4848
cond_true4848: ; preds = %entry
%tmp4851 = sub i32 -3, 0 ; <i32> [#uses=1]
%abc = add i32 %tmp4851, %tmp4845 ; <i32> [#uses=1]
ret i32 %abc
}
define i1 @f10(i32 %a) {
entry:
%tmp102 = icmp eq i32 -2, %a ; <i1> [#uses=1]
ret i1 %tmp102
}