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llvm-6502/test/CodeGen/X86/lsr-reuse.ll
Dan Gohman 1b7bf18def When determining the set of interesting reuse factors, consider 
strides in foreign loops. This helps locate reuse opportunities
with existing induction variables in foreign loops and reduces
the need for inserting new ones. This fixes rdar://7657764.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96629 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-19 00:05:23 +00:00

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; RUN: llc < %s -march=x86-64 -O3 -asm-verbose=false | FileCheck %s
target datalayout = "e-p:64:64:64"
target triple = "x86_64-unknown-unknown"
; Full strength reduction reduces register pressure from 5 to 4 here.
; Instruction selection should use the FLAGS value from the dec for
; the branch. Scheduling should push the adds upwards.
; CHECK: full_me_0:
; CHECK: movsd (%rsi), %xmm0
; CHECK: addq $8, %rsi
; CHECK: mulsd (%rdx), %xmm0
; CHECK: addq $8, %rdx
; CHECK: movsd %xmm0, (%rdi)
; CHECK: addq $8, %rdi
; CHECK: decq %rcx
; CHECK: jne
define void @full_me_0(double* nocapture %A, double* nocapture %B, double* nocapture %C, i64 %n) nounwind {
entry:
%t0 = icmp sgt i64 %n, 0
br i1 %t0, label %loop, label %return
loop:
%i = phi i64 [ %i.next, %loop ], [ 0, %entry ]
%Ai = getelementptr inbounds double* %A, i64 %i
%Bi = getelementptr inbounds double* %B, i64 %i
%Ci = getelementptr inbounds double* %C, i64 %i
%t1 = load double* %Bi
%t2 = load double* %Ci
%m = fmul double %t1, %t2
store double %m, double* %Ai
%i.next = add nsw i64 %i, 1
%exitcond = icmp eq i64 %i.next, %n
br i1 %exitcond, label %return, label %loop
return:
ret void
}
; Mostly-full strength reduction means we do full strength reduction on all
; except for the offsets.
;
; Given a choice between constant offsets -2048 and 2048, choose the negative
; value, because at boundary conditions it has a smaller encoding.
; TODO: That's an over-general heuristic. It would be better for the target
; to indicate what the encoding cost would be. Then using a 2048 offset
; would be better on x86-64, since the start value would be 0 instead of
; 2048.
; CHECK: mostly_full_me_0:
; CHECK: movsd -2048(%rsi), %xmm0
; CHECK: mulsd -2048(%rdx), %xmm0
; CHECK: movsd %xmm0, -2048(%rdi)
; CHECK: movsd (%rsi), %xmm0
; CHECK: addq $8, %rsi
; CHECK: divsd (%rdx), %xmm0
; CHECK: addq $8, %rdx
; CHECK: movsd %xmm0, (%rdi)
; CHECK: addq $8, %rdi
; CHECK: decq %rcx
; CHECK: jne
define void @mostly_full_me_0(double* nocapture %A, double* nocapture %B, double* nocapture %C, i64 %n) nounwind {
entry:
%t0 = icmp sgt i64 %n, 0
br i1 %t0, label %loop, label %return
loop:
%i = phi i64 [ %i.next, %loop ], [ 0, %entry ]
%Ai = getelementptr inbounds double* %A, i64 %i
%Bi = getelementptr inbounds double* %B, i64 %i
%Ci = getelementptr inbounds double* %C, i64 %i
%t1 = load double* %Bi
%t2 = load double* %Ci
%m = fmul double %t1, %t2
store double %m, double* %Ai
%j = add i64 %i, 256
%Aj = getelementptr inbounds double* %A, i64 %j
%Bj = getelementptr inbounds double* %B, i64 %j
%Cj = getelementptr inbounds double* %C, i64 %j
%t3 = load double* %Bj
%t4 = load double* %Cj
%o = fdiv double %t3, %t4
store double %o, double* %Aj
%i.next = add nsw i64 %i, 1
%exitcond = icmp eq i64 %i.next, %n
br i1 %exitcond, label %return, label %loop
return:
ret void
}
; A minor variation on mostly_full_me_0.
; Prefer to start the indvar at 0.
; CHECK: mostly_full_me_1:
; CHECK: movsd (%rsi), %xmm0
; CHECK: mulsd (%rdx), %xmm0
; CHECK: movsd %xmm0, (%rdi)
; CHECK: movsd -2048(%rsi), %xmm0
; CHECK: addq $8, %rsi
; CHECK: divsd -2048(%rdx), %xmm0
; CHECK: addq $8, %rdx
; CHECK: movsd %xmm0, -2048(%rdi)
; CHECK: addq $8, %rdi
; CHECK: decq %rcx
; CHECK: jne
define void @mostly_full_me_1(double* nocapture %A, double* nocapture %B, double* nocapture %C, i64 %n) nounwind {
entry:
%t0 = icmp sgt i64 %n, 0
br i1 %t0, label %loop, label %return
loop:
%i = phi i64 [ %i.next, %loop ], [ 0, %entry ]
%Ai = getelementptr inbounds double* %A, i64 %i
%Bi = getelementptr inbounds double* %B, i64 %i
%Ci = getelementptr inbounds double* %C, i64 %i
%t1 = load double* %Bi
%t2 = load double* %Ci
%m = fmul double %t1, %t2
store double %m, double* %Ai
%j = sub i64 %i, 256
%Aj = getelementptr inbounds double* %A, i64 %j
%Bj = getelementptr inbounds double* %B, i64 %j
%Cj = getelementptr inbounds double* %C, i64 %j
%t3 = load double* %Bj
%t4 = load double* %Cj
%o = fdiv double %t3, %t4
store double %o, double* %Aj
%i.next = add nsw i64 %i, 1
%exitcond = icmp eq i64 %i.next, %n
br i1 %exitcond, label %return, label %loop
return:
ret void
}
; A slightly less minor variation on mostly_full_me_0.
; CHECK: mostly_full_me_2:
; CHECK: movsd (%rsi), %xmm0
; CHECK: mulsd (%rdx), %xmm0
; CHECK: movsd %xmm0, (%rdi)
; CHECK: movsd -4096(%rsi), %xmm0
; CHECK: addq $8, %rsi
; CHECK: divsd -4096(%rdx), %xmm0
; CHECK: addq $8, %rdx
; CHECK: movsd %xmm0, -4096(%rdi)
; CHECK: addq $8, %rdi
; CHECK: decq %rcx
; CHECK: jne
define void @mostly_full_me_2(double* nocapture %A, double* nocapture %B, double* nocapture %C, i64 %n) nounwind {
entry:
%t0 = icmp sgt i64 %n, 0
br i1 %t0, label %loop, label %return
loop:
%i = phi i64 [ %i.next, %loop ], [ 0, %entry ]
%k = add i64 %i, 256
%Ak = getelementptr inbounds double* %A, i64 %k
%Bk = getelementptr inbounds double* %B, i64 %k
%Ck = getelementptr inbounds double* %C, i64 %k
%t1 = load double* %Bk
%t2 = load double* %Ck
%m = fmul double %t1, %t2
store double %m, double* %Ak
%j = sub i64 %i, 256
%Aj = getelementptr inbounds double* %A, i64 %j
%Bj = getelementptr inbounds double* %B, i64 %j
%Cj = getelementptr inbounds double* %C, i64 %j
%t3 = load double* %Bj
%t4 = load double* %Cj
%o = fdiv double %t3, %t4
store double %o, double* %Aj
%i.next = add nsw i64 %i, 1
%exitcond = icmp eq i64 %i.next, %n
br i1 %exitcond, label %return, label %loop
return:
ret void
}
; In this test, the counting IV exit value is used, so full strength reduction
; would not reduce register pressure. IndVarSimplify ought to simplify such
; cases away, but it's useful here to verify that LSR's register pressure
; heuristics are working as expected.
; CHECK: count_me_0:
; CHECK: movsd (%rsi,%rax,8), %xmm0
; CHECK: mulsd (%rdx,%rax,8), %xmm0
; CHECK: movsd %xmm0, (%rdi,%rax,8)
; CHECK: incq %rax
; CHECK: cmpq %rax, %rcx
; CHECK: jne
define i64 @count_me_0(double* nocapture %A, double* nocapture %B, double* nocapture %C, i64 %n) nounwind {
entry:
%t0 = icmp sgt i64 %n, 0
br i1 %t0, label %loop, label %return
loop:
%i = phi i64 [ %i.next, %loop ], [ 0, %entry ]
%Ai = getelementptr inbounds double* %A, i64 %i
%Bi = getelementptr inbounds double* %B, i64 %i
%Ci = getelementptr inbounds double* %C, i64 %i
%t1 = load double* %Bi
%t2 = load double* %Ci
%m = fmul double %t1, %t2
store double %m, double* %Ai
%i.next = add nsw i64 %i, 1
%exitcond = icmp eq i64 %i.next, %n
br i1 %exitcond, label %return, label %loop
return:
%q = phi i64 [ 0, %entry ], [ %i.next, %loop ]
ret i64 %q
}
; In this test, the trip count value is used, so full strength reduction
; would not reduce register pressure.
; (though it would reduce register pressure inside the loop...)
; CHECK: count_me_1:
; CHECK: movsd (%rsi,%rax,8), %xmm0
; CHECK: mulsd (%rdx,%rax,8), %xmm0
; CHECK: movsd %xmm0, (%rdi,%rax,8)
; CHECK: incq %rax
; CHECK: cmpq %rax, %rcx
; CHECK: jne
define i64 @count_me_1(double* nocapture %A, double* nocapture %B, double* nocapture %C, i64 %n) nounwind {
entry:
%t0 = icmp sgt i64 %n, 0
br i1 %t0, label %loop, label %return
loop:
%i = phi i64 [ %i.next, %loop ], [ 0, %entry ]
%Ai = getelementptr inbounds double* %A, i64 %i
%Bi = getelementptr inbounds double* %B, i64 %i
%Ci = getelementptr inbounds double* %C, i64 %i
%t1 = load double* %Bi
%t2 = load double* %Ci
%m = fmul double %t1, %t2
store double %m, double* %Ai
%i.next = add nsw i64 %i, 1
%exitcond = icmp eq i64 %i.next, %n
br i1 %exitcond, label %return, label %loop
return:
%q = phi i64 [ 0, %entry ], [ %n, %loop ]
ret i64 %q
}
; Full strength reduction doesn't save any registers here because the
; loop tripcount is a constant.
; CHECK: count_me_2:
; CHECK: movl $10, %eax
; CHECK: align
; CHECK: BB7_1:
; CHECK: movsd -40(%rdi,%rax,8), %xmm0
; CHECK: addsd -40(%rsi,%rax,8), %xmm0
; CHECK: movsd %xmm0, -40(%rdx,%rax,8)
; CHECK: movsd (%rdi,%rax,8), %xmm0
; CHECK: subsd (%rsi,%rax,8), %xmm0
; CHECK: movsd %xmm0, (%rdx,%rax,8)
; CHECK: incq %rax
; CHECK: cmpq $5010, %rax
; CHECK: jne
define void @count_me_2(double* nocapture %A, double* nocapture %B, double* nocapture %C) nounwind {
entry:
br label %loop
loop:
%i = phi i64 [ 0, %entry ], [ %i.next, %loop ]
%i5 = add i64 %i, 5
%Ai = getelementptr double* %A, i64 %i5
%t2 = load double* %Ai
%Bi = getelementptr double* %B, i64 %i5
%t4 = load double* %Bi
%t5 = fadd double %t2, %t4
%Ci = getelementptr double* %C, i64 %i5
store double %t5, double* %Ci
%i10 = add i64 %i, 10
%Ai10 = getelementptr double* %A, i64 %i10
%t9 = load double* %Ai10
%Bi10 = getelementptr double* %B, i64 %i10
%t11 = load double* %Bi10
%t12 = fsub double %t9, %t11
%Ci10 = getelementptr double* %C, i64 %i10
store double %t12, double* %Ci10
%i.next = add i64 %i, 1
%exitcond = icmp eq i64 %i.next, 5000
br i1 %exitcond, label %return, label %loop
return:
ret void
}
; This should be fully strength-reduced to reduce register pressure.
; CHECK: full_me_1:
; CHECK: align
; CHECK: BB8_1:
; CHECK: movsd (%rdi), %xmm0
; CHECK: addsd (%rsi), %xmm0
; CHECK: movsd %xmm0, (%rdx)
; CHECK: movsd 40(%rdi), %xmm0
; CHECK: addq $8, %rdi
; CHECK: subsd 40(%rsi), %xmm0
; CHECK: addq $8, %rsi
; CHECK: movsd %xmm0, 40(%rdx)
; CHECK: addq $8, %rdx
; CHECK: decq %rcx
; CHECK: jne
define void @full_me_1(double* nocapture %A, double* nocapture %B, double* nocapture %C, i64 %n) nounwind {
entry:
br label %loop
loop:
%i = phi i64 [ 0, %entry ], [ %i.next, %loop ]
%i5 = add i64 %i, 5
%Ai = getelementptr double* %A, i64 %i5
%t2 = load double* %Ai
%Bi = getelementptr double* %B, i64 %i5
%t4 = load double* %Bi
%t5 = fadd double %t2, %t4
%Ci = getelementptr double* %C, i64 %i5
store double %t5, double* %Ci
%i10 = add i64 %i, 10
%Ai10 = getelementptr double* %A, i64 %i10
%t9 = load double* %Ai10
%Bi10 = getelementptr double* %B, i64 %i10
%t11 = load double* %Bi10
%t12 = fsub double %t9, %t11
%Ci10 = getelementptr double* %C, i64 %i10
store double %t12, double* %Ci10
%i.next = add i64 %i, 1
%exitcond = icmp eq i64 %i.next, %n
br i1 %exitcond, label %return, label %loop
return:
ret void
}
; This is a variation on full_me_0 in which the 0,+,1 induction variable
; has a non-address use, pinning that value in a register.
; CHECK: count_me_3:
; CHECK: call
; CHECK: movsd (%r15,%r13,8), %xmm0
; CHECK: mulsd (%r14,%r13,8), %xmm0
; CHECK: movsd %xmm0, (%r12,%r13,8)
; CHECK: incq %r13
; CHECK: cmpq %r13, %rbx
; CHECK: jne
declare void @use(i64)
define void @count_me_3(double* nocapture %A, double* nocapture %B, double* nocapture %C, i64 %n) nounwind {
entry:
%t0 = icmp sgt i64 %n, 0
br i1 %t0, label %loop, label %return
loop:
%i = phi i64 [ %i.next, %loop ], [ 0, %entry ]
call void @use(i64 %i)
%Ai = getelementptr inbounds double* %A, i64 %i
%Bi = getelementptr inbounds double* %B, i64 %i
%Ci = getelementptr inbounds double* %C, i64 %i
%t1 = load double* %Bi
%t2 = load double* %Ci
%m = fmul double %t1, %t2
store double %m, double* %Ai
%i.next = add nsw i64 %i, 1
%exitcond = icmp eq i64 %i.next, %n
br i1 %exitcond, label %return, label %loop
return:
ret void
}
; LSR should use only one indvar for the inner loop.
; rdar://7657764
; CHECK: asd:
; CHECK: BB10_5:
; CHECK-NEXT: addl (%r{{[^,]*}},%rdi,4), %e
; CHECK-NEXT: incq %rdi
; CHECK-NEXT: cmpq %rdi, %r{{[^,]*}}
; CHECK-NEXT: jg
%struct.anon = type { i32, [4200 x i32] }
@bars = common global [123123 x %struct.anon] zeroinitializer, align 32 ; <[123123 x %struct.anon]*> [#uses=2]
define i32 @asd(i32 %n) nounwind readonly {
entry:
%0 = icmp sgt i32 %n, 0 ; <i1> [#uses=1]
br i1 %0, label %bb.nph14, label %bb5
bb.nph14: ; preds = %entry
%tmp18 = zext i32 %n to i64 ; <i64> [#uses=1]
br label %bb
bb: ; preds = %bb3, %bb.nph14
%indvar16 = phi i64 [ 0, %bb.nph14 ], [ %indvar.next17, %bb3 ] ; <i64> [#uses=3]
%s.113 = phi i32 [ 0, %bb.nph14 ], [ %s.0.lcssa, %bb3 ] ; <i32> [#uses=2]
%scevgep2526 = getelementptr [123123 x %struct.anon]* @bars, i64 0, i64 %indvar16, i32 0 ; <i32*> [#uses=1]
%1 = load i32* %scevgep2526, align 4 ; <i32> [#uses=2]
%2 = icmp sgt i32 %1, 0 ; <i1> [#uses=1]
br i1 %2, label %bb.nph, label %bb3
bb.nph: ; preds = %bb
%tmp23 = sext i32 %1 to i64 ; <i64> [#uses=1]
br label %bb1
bb1: ; preds = %bb.nph, %bb1
%indvar = phi i64 [ 0, %bb.nph ], [ %tmp19, %bb1 ] ; <i64> [#uses=2]
%s.07 = phi i32 [ %s.113, %bb.nph ], [ %4, %bb1 ] ; <i32> [#uses=1]
%c.08 = getelementptr [123123 x %struct.anon]* @bars, i64 0, i64 %indvar16, i32 1, i64 %indvar ; <i32*> [#uses=1]
%3 = load i32* %c.08, align 4 ; <i32> [#uses=1]
%4 = add nsw i32 %3, %s.07 ; <i32> [#uses=2]
%tmp19 = add i64 %indvar, 1 ; <i64> [#uses=2]
%5 = icmp sgt i64 %tmp23, %tmp19 ; <i1> [#uses=1]
br i1 %5, label %bb1, label %bb3
bb3: ; preds = %bb1, %bb
%s.0.lcssa = phi i32 [ %s.113, %bb ], [ %4, %bb1 ] ; <i32> [#uses=2]
%indvar.next17 = add i64 %indvar16, 1 ; <i64> [#uses=2]
%exitcond = icmp eq i64 %indvar.next17, %tmp18 ; <i1> [#uses=1]
br i1 %exitcond, label %bb5, label %bb
bb5: ; preds = %bb3, %entry
%s.1.lcssa = phi i32 [ 0, %entry ], [ %s.0.lcssa, %bb3 ] ; <i32> [#uses=1]
ret i32 %s.1.lcssa
}
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