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Add a test case for large integer subtraction via subcarry. NFC

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llvm-svn: 303528
This commit is contained in:
Amaury Sechet 2017-05-22 06:06:45 +00:00
parent 38fa67769f
commit c329902158
1 changed files with 76 additions and 0 deletions
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76
test/CodeGen/X86/subcarry.ll
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@ -59,3 +59,79 @@ entry:
%31 = insertvalue %S undef, [4 x i64] %30, 0
ret %S %31
}
define %S @sub(%S* nocapture readonly %this, %S %arg.b) local_unnamed_addr {
; CHECK-LABEL: sub:
; CHECK: # BB#0: # %entry
; CHECK-NEXT: notq %rdx
; CHECK-NEXT: xorl %r10d, %r10d
; CHECK-NEXT: addq (%rsi), %rdx
; CHECK-NEXT: setb %r10b
; CHECK-NEXT: addq $1, %rdx
; CHECK-NEXT: adcq 8(%rsi), %r10
; CHECK-NEXT: setb %al
; CHECK-NEXT: movzbl %al, %r11d
; CHECK-NEXT: notq %rcx
; CHECK-NEXT: addq %r10, %rcx
; CHECK-NEXT: adcq 16(%rsi), %r11
; CHECK-NEXT: setb %al
; CHECK-NEXT: movzbl %al, %eax
; CHECK-NEXT: notq %r8
; CHECK-NEXT: addq %r11, %r8
; CHECK-NEXT: adcq 24(%rsi), %rax
; CHECK-NEXT: notq %r9
; CHECK-NEXT: addq %rax, %r9
; CHECK-NEXT: movq %rdx, (%rdi)
; CHECK-NEXT: movq %rcx, 8(%rdi)
; CHECK-NEXT: movq %r8, 16(%rdi)
; CHECK-NEXT: movq %r9, 24(%rdi)
; CHECK-NEXT: movq %rdi, %rax
; CHECK-NEXT: retq
entry:
%0 = extractvalue %S %arg.b, 0
%.elt6 = extractvalue [4 x i64] %0, 1
%.elt8 = extractvalue [4 x i64] %0, 2
%.elt10 = extractvalue [4 x i64] %0, 3
%.elt = extractvalue [4 x i64] %0, 0
%1 = getelementptr inbounds %S, %S* %this, i64 0, i32 0, i64 0
%2 = load i64, i64* %1, align 8
%3 = zext i64 %2 to i128
%4 = add nuw nsw i128 %3, 1
%5 = xor i64 %.elt, -1
%6 = zext i64 %5 to i128
%7 = add nuw nsw i128 %4, %6
%8 = trunc i128 %7 to i64
%9 = lshr i128 %7, 64
%10 = getelementptr inbounds %S, %S* %this, i64 0, i32 0, i64 1
%11 = load i64, i64* %10, align 8
%12 = zext i64 %11 to i128
%13 = add nuw nsw i128 %9, %12
%14 = xor i64 %.elt6, -1
%15 = zext i64 %14 to i128
%16 = add nuw nsw i128 %13, %15
%17 = trunc i128 %16 to i64
%18 = lshr i128 %16, 64
%19 = getelementptr inbounds %S, %S* %this, i64 0, i32 0, i64 2
%20 = load i64, i64* %19, align 8
%21 = zext i64 %20 to i128
%22 = add nuw nsw i128 %18, %21
%23 = xor i64 %.elt8, -1
%24 = zext i64 %23 to i128
%25 = add nuw nsw i128 %22, %24
%26 = lshr i128 %25, 64
%27 = trunc i128 %25 to i64
%28 = getelementptr inbounds %S, %S* %this, i64 0, i32 0, i64 3
%29 = load i64, i64* %28, align 8
%30 = zext i64 %29 to i128
%31 = add nuw nsw i128 %26, %30
%32 = xor i64 %.elt10, -1
%33 = zext i64 %32 to i128
%34 = add nuw nsw i128 %31, %33
%35 = trunc i128 %34 to i64
%36 = insertvalue [4 x i64] undef, i64 %8, 0
%37 = insertvalue [4 x i64] %36, i64 %17, 1
%38 = insertvalue [4 x i64] %37, i64 %27, 2
%39 = insertvalue [4 x i64] %38, i64 %35, 3
%40 = insertvalue %S undef, [4 x i64] %39, 0
ret %S %40
}