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llvm-6502/test/CodeGen/X86/jump_sign.ll
Matthias Braun 47941aa098 DAGCombiner: Canonicalize select(and/or,x,y) depending on target. 
This is based on the following equivalences:
select(C0 & C1, X, Y) <=> select(C0, select(C1, X, Y), Y)
select(C0 | C1, X, Y) <=> select(C0, X, select(C1, X, Y))

Many target cannot perform and/or on the CPU flags and therefore the
right side should be choosen to avoid materializign the i1 flags in an
integer register. If the target can perform this operation efficiently
we normalize to the left form.

Differential Revision: http://reviews.llvm.org/D7622

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231507 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-06 19:49:10 +00:00

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7.1 KiB
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; RUN: llc < %s -march=x86 -mcpu=pentiumpro -verify-machineinstrs | FileCheck %s
define i32 @func_f(i32 %X) {
entry:
; CHECK-LABEL: func_f:
; CHECK: jns
%tmp1 = add i32 %X, 1 ; <i32> [#uses=1]
%tmp = icmp slt i32 %tmp1, 0 ; <i1> [#uses=1]
br i1 %tmp, label %cond_true, label %cond_next
cond_true: ; preds = %entry
%tmp2 = tail call i32 (...)* @bar( ) ; <i32> [#uses=0]
br label %cond_next
cond_next: ; preds = %cond_true, %entry
%tmp3 = tail call i32 (...)* @baz( ) ; <i32> [#uses=0]
ret i32 undef
}
declare i32 @bar(...)
declare i32 @baz(...)
; rdar://10633221
; rdar://11355268
define i32 @func_g(i32 %a, i32 %b) nounwind {
entry:
; CHECK-LABEL: func_g:
; CHECK-NOT: test
; CHECK: cmovs
%sub = sub nsw i32 %a, %b
%cmp = icmp sgt i32 %sub, 0
%cond = select i1 %cmp, i32 %sub, i32 0
ret i32 %cond
}
; rdar://10734411
define i32 @func_h(i32 %a, i32 %b) nounwind {
entry:
; CHECK-LABEL: func_h:
; CHECK-NOT: cmp
; CHECK: cmov
; CHECK-NOT: movl
; CHECK: ret
%cmp = icmp slt i32 %b, %a
%sub = sub nsw i32 %a, %b
%cond = select i1 %cmp, i32 %sub, i32 0
ret i32 %cond
}
define i32 @func_i(i32 %a, i32 %b) nounwind {
entry:
; CHECK-LABEL: func_i:
; CHECK-NOT: cmp
; CHECK: cmov
; CHECK-NOT: movl
; CHECK: ret
%cmp = icmp sgt i32 %a, %b
%sub = sub nsw i32 %a, %b
%cond = select i1 %cmp, i32 %sub, i32 0
ret i32 %cond
}
define i32 @func_j(i32 %a, i32 %b) nounwind {
entry:
; CHECK-LABEL: func_j:
; CHECK-NOT: cmp
; CHECK: cmov
; CHECK-NOT: movl
; CHECK: ret
%cmp = icmp ugt i32 %a, %b
%sub = sub i32 %a, %b
%cond = select i1 %cmp, i32 %sub, i32 0
ret i32 %cond
}
define i32 @func_k(i32 %a, i32 %b) nounwind {
entry:
; CHECK-LABEL: func_k:
; CHECK-NOT: cmp
; CHECK: cmov
; CHECK-NOT: movl
; CHECK: ret
%cmp = icmp ult i32 %b, %a
%sub = sub i32 %a, %b
%cond = select i1 %cmp, i32 %sub, i32 0
ret i32 %cond
}
; redundant cmp instruction
define i32 @func_l(i32 %a, i32 %b) nounwind {
entry:
; CHECK-LABEL: func_l:
; CHECK-NOT: cmp
%cmp = icmp slt i32 %b, %a
%sub = sub nsw i32 %a, %b
%cond = select i1 %cmp, i32 %sub, i32 %a
ret i32 %cond
}
define i32 @func_m(i32 %a, i32 %b) nounwind {
entry:
; CHECK-LABEL: func_m:
; CHECK-NOT: cmp
%cmp = icmp sgt i32 %a, %b
%sub = sub nsw i32 %a, %b
%cond = select i1 %cmp, i32 %b, i32 %sub
ret i32 %cond
}
; If EFLAGS is live-out, we can't remove cmp if there exists
; a swapped sub.
define i32 @func_l2(i32 %a, i32 %b) nounwind {
entry:
; CHECK-LABEL: func_l2:
; CHECK: cmp
%cmp = icmp eq i32 %b, %a
%sub = sub nsw i32 %a, %b
br i1 %cmp, label %if.then, label %if.else
if.then:
%cmp2 = icmp sgt i32 %b, %a
%sel = select i1 %cmp2, i32 %sub, i32 %a
ret i32 %sel
if.else:
ret i32 %sub
}
define i32 @func_l3(i32 %a, i32 %b) nounwind {
entry:
; CHECK-LABEL: func_l3:
; CHECK: sub
; CHECK-NOT: cmp
; CHECK: jge
%cmp = icmp sgt i32 %b, %a
%sub = sub nsw i32 %a, %b
br i1 %cmp, label %if.then, label %if.else
if.then:
ret i32 %sub
if.else:
%add = add nsw i32 %sub, 1
ret i32 %add
}
; rdar://11830760
; When Movr0 is between sub and cmp, we need to move "Movr0" before sub.
define i32 @func_l4(i32 %a, i32 %b) nounwind {
entry:
; CHECK-LABEL: func_l4:
; CHECK: xor
; CHECK: sub
; CHECK-NOT: cmp
%cmp = icmp sgt i32 %b, %a
%sub = sub i32 %a, %b
%.sub = select i1 %cmp, i32 0, i32 %sub
ret i32 %.sub
}
; rdar://11540023
define i32 @func_n(i32 %x, i32 %y) nounwind {
entry:
; CHECK-LABEL: func_n:
; CHECK-NOT: sub
; CHECK: cmp
%sub = sub nsw i32 %x, %y
%cmp = icmp slt i32 %sub, 0
%y.x = select i1 %cmp, i32 %y, i32 %x
ret i32 %y.x
}
; PR://13046
define void @func_o() nounwind uwtable {
entry:
%0 = load i16, i16* undef, align 2
br i1 undef, label %if.then.i, label %if.end.i
if.then.i: ; preds = %entry
unreachable
if.end.i: ; preds = %entry
br i1 undef, label %sw.bb, label %sw.default
sw.bb: ; preds = %if.end.i
br i1 undef, label %if.then44, label %if.end29
if.end29: ; preds = %sw.bb
; CHECK-LABEL: func_o:
; CHECK: cmp
%1 = urem i16 %0, 10
%cmp25 = icmp eq i16 %1, 0
%. = select i1 %cmp25, i16 2, i16 0
br i1 %cmp25, label %if.then44, label %sw.default
sw.default: ; preds = %if.end29, %if.end.i
br i1 undef, label %if.then.i96, label %if.else.i97
if.then.i96: ; preds = %sw.default
unreachable
if.else.i97: ; preds = %sw.default
unreachable
if.then44: ; preds = %if.end29, %sw.bb
%aModeRefSel.1.ph = phi i16 [ %., %if.end29 ], [ 3, %sw.bb ]
br i1 undef, label %if.then.i103, label %if.else.i104
if.then.i103: ; preds = %if.then44
unreachable
if.else.i104: ; preds = %if.then44
ret void
}
; rdar://11855129
define i32 @func_p(i32 %a, i32 %b) nounwind {
entry:
; CHECK-LABEL: func_p:
; CHECK-NOT: test
; CHECK: cmovs
%add = add nsw i32 %b, %a
%cmp = icmp sgt i32 %add, 0
%add. = select i1 %cmp, i32 %add, i32 0
ret i32 %add.
}
; PR13475
; If we have sub a, b and cmp b, a and the result of cmp is used
; by sbb, we should not optimize cmp away.
define i32 @func_q(i32 %a0, i32 %a1, i32 %a2) {
; CHECK-LABEL: func_q:
; CHECK: cmp
; CHECK-NEXT: sbb
%1 = icmp ult i32 %a0, %a1
%2 = sub i32 %a1, %a0
%3 = select i1 %1, i32 -1, i32 0
%4 = xor i32 %2, %3
ret i32 %4
}
; rdar://11873276
define i8* @func_r(i8* %base, i32* nocapture %offset, i32 %size) nounwind {
entry:
; CHECK-LABEL: func_r:
; CHECK: sub
; CHECK-NOT: cmp
; CHECK: j
; CHECK-NOT: sub
; CHECK: ret
%0 = load i32, i32* %offset, align 8
%cmp = icmp slt i32 %0, %size
br i1 %cmp, label %return, label %if.end
if.end:
%sub = sub nsw i32 %0, %size
store i32 %sub, i32* %offset, align 8
%add.ptr = getelementptr inbounds i8, i8* %base, i32 %sub
br label %return
return:
%retval.0 = phi i8* [ %add.ptr, %if.end ], [ null, %entry ]
ret i8* %retval.0
}
; Test optimizations of dec/inc.
define i32 @func_dec(i32 %a) nounwind {
entry:
; CHECK-LABEL: func_dec:
; CHECK: decl
; CHECK-NOT: test
; CHECK: cmovsl
%sub = sub nsw i32 %a, 1
%cmp = icmp sgt i32 %sub, 0
%cond = select i1 %cmp, i32 %sub, i32 0
ret i32 %cond
}
define i32 @func_inc(i32 %a) nounwind {
entry:
; CHECK-LABEL: func_inc:
; CHECK: incl
; CHECK-NOT: test
; CHECK: cmovsl
%add = add nsw i32 %a, 1
%cmp = icmp sgt i32 %add, 0
%cond = select i1 %cmp, i32 %add, i32 0
ret i32 %cond
}
; PR13966
@b = common global i32 0, align 4
@a = common global i32 0, align 4
define i32 @func_test1(i32 %p1) nounwind uwtable {
entry:
; CHECK-LABEL: func_test1:
; CHECK: andb
; CHECK: j
; CHECK: ret
%0 = load i32, i32* @b, align 4
%cmp = icmp ult i32 %0, %p1
%conv = zext i1 %cmp to i32
%1 = load i32, i32* @a, align 4
%and = and i32 %conv, %1
%conv1 = trunc i32 %and to i8
%2 = urem i8 %conv1, 3
%tobool = icmp eq i8 %2, 0
br i1 %tobool, label %if.end, label %if.then
if.then:
%dec = add nsw i32 %1, -1
store i32 %dec, i32* @a, align 4
br label %if.end
if.end:
ret i32 undef
}
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