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[x86] add tests to show demanded bits shortcoming; NFC 

llvm-svn: 324408
This commit is contained in:
Sanjay Patel 2018-02-06 21:43:57 +00:00
parent ae5bc5aeea
commit 0cdc273ada
1 changed files with 42 additions and 0 deletions
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42
llvm/test/CodeGen/X86/zext-demanded.ll
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@ -97,3 +97,45 @@ define i32 @test8(i32 %x) {
%z = or i32 %y, 1
ret i32 %z
}
define i64 @add_neg_one(i64 %x) {
; CHECK-LABEL: add_neg_one:
; CHECK: # %bb.0:
; CHECK-NEXT: leal 65535(%rdi), %eax
; CHECK-NEXT: andl %edi, %eax
; CHECK-NEXT: movzwl %ax, %eax
; CHECK-NEXT: retq
%a1 = and i64 %x, 65535
%a2 = add i64 %x, 65535
%r = and i64 %a1, %a2
ret i64 %r
}
define i64 @sub_neg_one(i64 %x) {
; CHECK-LABEL: sub_neg_one:
; CHECK: # %bb.0:
; CHECK-NEXT: leal -65535(%rdi), %eax
; CHECK-NEXT: andl %edi, %eax
; CHECK-NEXT: movzwl %ax, %eax
; CHECK-NEXT: retq
%a1 = and i64 %x, 65535
%a2 = sub i64 %x, 65535
%r = and i64 %a1, %a2
ret i64 %r
}
define i64 @mul_neg_one(i64 %x) {
; CHECK-LABEL: mul_neg_one:
; CHECK: # %bb.0:
; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: shll $16, %eax
; CHECK-NEXT: subl %edi, %eax
; CHECK-NEXT: andl %edi, %eax
; CHECK-NEXT: movzwl %ax, %eax
; CHECK-NEXT: retq
%a1 = and i64 %x, 65535
%a2 = mul i64 %x, 65535
%r = and i64 %a1, %a2
ret i64 %r
}