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llvm-6502/test/CodeGen/SystemZ/spill-01.ll
Richard Sandiford 086791eca2 Add TargetLowering::prepareVolatileOrAtomicLoad 
One unusual feature of the z architecture is that the result of a
previous load can be reused indefinitely for subsequent loads, even if
a cache-coherent store to that location is performed by another CPU.
A special serializing instruction must be used if you want to force
a load to be reattempted.

Since volatile loads are not supposed to be omitted in this way,
we should insert a serializing instruction before each such load.
The same goes for atomic loads.

The patch implements this at the IR->DAG boundary, in a similar way
to atomic fences.  It is a no-op for targets other than SystemZ.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196905 91177308-0d34-0410-b5e6-96231b3b80d8
2013-12-10 10:36:34 +00:00

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; Test spilling using MVC. The tests here assume z10 register pressure,
; without the high words being available.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z10 | FileCheck %s
declare void @foo()
@g0 = global i32 0
@g1 = global i32 1
@g2 = global i32 2
@g3 = global i32 3
@g4 = global i32 4
@g5 = global i32 5
@g6 = global i32 6
@g7 = global i32 7
@g8 = global i32 8
@g9 = global i32 9
@h0 = global i64 0
@h1 = global i64 1
@h2 = global i64 2
@h3 = global i64 3
@h4 = global i64 4
@h5 = global i64 5
@h6 = global i64 6
@h7 = global i64 7
@h8 = global i64 8
@h9 = global i64 9
; This function shouldn't spill anything
define void @f1(i32 *%ptr0) {
; CHECK-LABEL: f1:
; CHECK: stmg
; CHECK: aghi %r15, -160
; CHECK-NOT: %r15
; CHECK: brasl %r14, foo@PLT
; CHECK-NOT: %r15
; CHECK: lmg
; CHECK: br %r14
%ptr1 = getelementptr i32 *%ptr0, i32 2
%ptr2 = getelementptr i32 *%ptr0, i32 4
%ptr3 = getelementptr i32 *%ptr0, i32 6
%ptr4 = getelementptr i32 *%ptr0, i32 8
%ptr5 = getelementptr i32 *%ptr0, i32 10
%ptr6 = getelementptr i32 *%ptr0, i32 12
%val0 = load i32 *%ptr0
%val1 = load i32 *%ptr1
%val2 = load i32 *%ptr2
%val3 = load i32 *%ptr3
%val4 = load i32 *%ptr4
%val5 = load i32 *%ptr5
%val6 = load i32 *%ptr6
call void @foo()
store i32 %val0, i32 *%ptr0
store i32 %val1, i32 *%ptr1
store i32 %val2, i32 *%ptr2
store i32 %val3, i32 *%ptr3
store i32 %val4, i32 *%ptr4
store i32 %val5, i32 *%ptr5
store i32 %val6, i32 *%ptr6
ret void
}
; Test a case where at least one i32 load and at least one i32 store
; need spills.
define void @f2(i32 *%ptr0) {
; CHECK-LABEL: f2:
; CHECK: mvc [[OFFSET1:16[04]]](4,%r15), [[OFFSET2:[0-9]+]]({{%r[0-9]+}})
; CHECK: brasl %r14, foo@PLT
; CHECK: mvc [[OFFSET2]](4,{{%r[0-9]+}}), [[OFFSET1]](%r15)
; CHECK: br %r14
%ptr1 = getelementptr i32 *%ptr0, i64 2
%ptr2 = getelementptr i32 *%ptr0, i64 4
%ptr3 = getelementptr i32 *%ptr0, i64 6
%ptr4 = getelementptr i32 *%ptr0, i64 8
%ptr5 = getelementptr i32 *%ptr0, i64 10
%ptr6 = getelementptr i32 *%ptr0, i64 12
%ptr7 = getelementptr i32 *%ptr0, i64 14
%ptr8 = getelementptr i32 *%ptr0, i64 16
%val0 = load i32 *%ptr0
%val1 = load i32 *%ptr1
%val2 = load i32 *%ptr2
%val3 = load i32 *%ptr3
%val4 = load i32 *%ptr4
%val5 = load i32 *%ptr5
%val6 = load i32 *%ptr6
%val7 = load i32 *%ptr7
%val8 = load i32 *%ptr8
call void @foo()
store i32 %val0, i32 *%ptr0
store i32 %val1, i32 *%ptr1
store i32 %val2, i32 *%ptr2
store i32 %val3, i32 *%ptr3
store i32 %val4, i32 *%ptr4
store i32 %val5, i32 *%ptr5
store i32 %val6, i32 *%ptr6
store i32 %val7, i32 *%ptr7
store i32 %val8, i32 *%ptr8
ret void
}
; Test a case where at least one i64 load and at least one i64 store
; need spills.
define void @f3(i64 *%ptr0) {
; CHECK-LABEL: f3:
; CHECK: mvc 160(8,%r15), [[OFFSET:[0-9]+]]({{%r[0-9]+}})
; CHECK: brasl %r14, foo@PLT
; CHECK: mvc [[OFFSET]](8,{{%r[0-9]+}}), 160(%r15)
; CHECK: br %r14
%ptr1 = getelementptr i64 *%ptr0, i64 2
%ptr2 = getelementptr i64 *%ptr0, i64 4
%ptr3 = getelementptr i64 *%ptr0, i64 6
%ptr4 = getelementptr i64 *%ptr0, i64 8
%ptr5 = getelementptr i64 *%ptr0, i64 10
%ptr6 = getelementptr i64 *%ptr0, i64 12
%ptr7 = getelementptr i64 *%ptr0, i64 14
%ptr8 = getelementptr i64 *%ptr0, i64 16
%val0 = load i64 *%ptr0
%val1 = load i64 *%ptr1
%val2 = load i64 *%ptr2
%val3 = load i64 *%ptr3
%val4 = load i64 *%ptr4
%val5 = load i64 *%ptr5
%val6 = load i64 *%ptr6
%val7 = load i64 *%ptr7
%val8 = load i64 *%ptr8
call void @foo()
store i64 %val0, i64 *%ptr0
store i64 %val1, i64 *%ptr1
store i64 %val2, i64 *%ptr2
store i64 %val3, i64 *%ptr3
store i64 %val4, i64 *%ptr4
store i64 %val5, i64 *%ptr5
store i64 %val6, i64 *%ptr6
store i64 %val7, i64 *%ptr7
store i64 %val8, i64 *%ptr8
ret void
}
; Test a case where at least at least one f32 load and at least one f32 store
; need spills. The 8 call-saved FPRs could be used for 8 of the %vals
; (and are at the time of writing), but it would really be better to use
; MVC for all 10.
define void @f4(float *%ptr0) {
; CHECK-LABEL: f4:
; CHECK: mvc [[OFFSET1:16[04]]](4,%r15), [[OFFSET2:[0-9]+]]({{%r[0-9]+}})
; CHECK: brasl %r14, foo@PLT
; CHECK: mvc [[OFFSET2]](4,{{%r[0-9]+}}), [[OFFSET1]](%r15)
; CHECK: br %r14
%ptr1 = getelementptr float *%ptr0, i64 2
%ptr2 = getelementptr float *%ptr0, i64 4
%ptr3 = getelementptr float *%ptr0, i64 6
%ptr4 = getelementptr float *%ptr0, i64 8
%ptr5 = getelementptr float *%ptr0, i64 10
%ptr6 = getelementptr float *%ptr0, i64 12
%ptr7 = getelementptr float *%ptr0, i64 14
%ptr8 = getelementptr float *%ptr0, i64 16
%ptr9 = getelementptr float *%ptr0, i64 18
%val0 = load float *%ptr0
%val1 = load float *%ptr1
%val2 = load float *%ptr2
%val3 = load float *%ptr3
%val4 = load float *%ptr4
%val5 = load float *%ptr5
%val6 = load float *%ptr6
%val7 = load float *%ptr7
%val8 = load float *%ptr8
%val9 = load float *%ptr9
call void @foo()
store float %val0, float *%ptr0
store float %val1, float *%ptr1
store float %val2, float *%ptr2
store float %val3, float *%ptr3
store float %val4, float *%ptr4
store float %val5, float *%ptr5
store float %val6, float *%ptr6
store float %val7, float *%ptr7
store float %val8, float *%ptr8
store float %val9, float *%ptr9
ret void
}
; Similarly for f64.
define void @f5(double *%ptr0) {
; CHECK-LABEL: f5:
; CHECK: mvc 160(8,%r15), [[OFFSET:[0-9]+]]({{%r[0-9]+}})
; CHECK: brasl %r14, foo@PLT
; CHECK: mvc [[OFFSET]](8,{{%r[0-9]+}}), 160(%r15)
; CHECK: br %r14
%ptr1 = getelementptr double *%ptr0, i64 2
%ptr2 = getelementptr double *%ptr0, i64 4
%ptr3 = getelementptr double *%ptr0, i64 6
%ptr4 = getelementptr double *%ptr0, i64 8
%ptr5 = getelementptr double *%ptr0, i64 10
%ptr6 = getelementptr double *%ptr0, i64 12
%ptr7 = getelementptr double *%ptr0, i64 14
%ptr8 = getelementptr double *%ptr0, i64 16
%ptr9 = getelementptr double *%ptr0, i64 18
%val0 = load double *%ptr0
%val1 = load double *%ptr1
%val2 = load double *%ptr2
%val3 = load double *%ptr3
%val4 = load double *%ptr4
%val5 = load double *%ptr5
%val6 = load double *%ptr6
%val7 = load double *%ptr7
%val8 = load double *%ptr8
%val9 = load double *%ptr9
call void @foo()
store double %val0, double *%ptr0
store double %val1, double *%ptr1
store double %val2, double *%ptr2
store double %val3, double *%ptr3
store double %val4, double *%ptr4
store double %val5, double *%ptr5
store double %val6, double *%ptr6
store double %val7, double *%ptr7
store double %val8, double *%ptr8
store double %val9, double *%ptr9
ret void
}
; Repeat f2 with atomic accesses. We shouldn't use MVC here.
define void @f6(i32 *%ptr0) {
; CHECK-LABEL: f6:
; CHECK-NOT: mvc
; CHECK: br %r14
%ptr1 = getelementptr i32 *%ptr0, i64 2
%ptr2 = getelementptr i32 *%ptr0, i64 4
%ptr3 = getelementptr i32 *%ptr0, i64 6
%ptr4 = getelementptr i32 *%ptr0, i64 8
%ptr5 = getelementptr i32 *%ptr0, i64 10
%ptr6 = getelementptr i32 *%ptr0, i64 12
%ptr7 = getelementptr i32 *%ptr0, i64 14
%ptr8 = getelementptr i32 *%ptr0, i64 16
%val0 = load atomic i32 *%ptr0 unordered, align 4
%val1 = load atomic i32 *%ptr1 unordered, align 4
%val2 = load atomic i32 *%ptr2 unordered, align 4
%val3 = load atomic i32 *%ptr3 unordered, align 4
%val4 = load atomic i32 *%ptr4 unordered, align 4
%val5 = load atomic i32 *%ptr5 unordered, align 4
%val6 = load atomic i32 *%ptr6 unordered, align 4
%val7 = load atomic i32 *%ptr7 unordered, align 4
%val8 = load atomic i32 *%ptr8 unordered, align 4
call void @foo()
store atomic i32 %val0, i32 *%ptr0 unordered, align 4
store atomic i32 %val1, i32 *%ptr1 unordered, align 4
store atomic i32 %val2, i32 *%ptr2 unordered, align 4
store atomic i32 %val3, i32 *%ptr3 unordered, align 4
store atomic i32 %val4, i32 *%ptr4 unordered, align 4
store atomic i32 %val5, i32 *%ptr5 unordered, align 4
store atomic i32 %val6, i32 *%ptr6 unordered, align 4
store atomic i32 %val7, i32 *%ptr7 unordered, align 4
store atomic i32 %val8, i32 *%ptr8 unordered, align 4
ret void
}
; ...likewise volatile accesses.
define void @f7(i32 *%ptr0) {
; CHECK-LABEL: f7:
; CHECK-NOT: mvc
; CHECK: br %r14
%ptr1 = getelementptr i32 *%ptr0, i64 2
%ptr2 = getelementptr i32 *%ptr0, i64 4
%ptr3 = getelementptr i32 *%ptr0, i64 6
%ptr4 = getelementptr i32 *%ptr0, i64 8
%ptr5 = getelementptr i32 *%ptr0, i64 10
%ptr6 = getelementptr i32 *%ptr0, i64 12
%ptr7 = getelementptr i32 *%ptr0, i64 14
%ptr8 = getelementptr i32 *%ptr0, i64 16
%val0 = load volatile i32 *%ptr0
%val1 = load volatile i32 *%ptr1
%val2 = load volatile i32 *%ptr2
%val3 = load volatile i32 *%ptr3
%val4 = load volatile i32 *%ptr4
%val5 = load volatile i32 *%ptr5
%val6 = load volatile i32 *%ptr6
%val7 = load volatile i32 *%ptr7
%val8 = load volatile i32 *%ptr8
call void @foo()
store volatile i32 %val0, i32 *%ptr0
store volatile i32 %val1, i32 *%ptr1
store volatile i32 %val2, i32 *%ptr2
store volatile i32 %val3, i32 *%ptr3
store volatile i32 %val4, i32 *%ptr4
store volatile i32 %val5, i32 *%ptr5
store volatile i32 %val6, i32 *%ptr6
store volatile i32 %val7, i32 *%ptr7
store volatile i32 %val8, i32 *%ptr8
ret void
}
; Check that LRL and STRL are not converted.
define void @f8() {
; CHECK-LABEL: f8:
; CHECK-NOT: mvc
; CHECK: br %r14
%val0 = load i32 *@g0
%val1 = load i32 *@g1
%val2 = load i32 *@g2
%val3 = load i32 *@g3
%val4 = load i32 *@g4
%val5 = load i32 *@g5
%val6 = load i32 *@g6
%val7 = load i32 *@g7
%val8 = load i32 *@g8
%val9 = load i32 *@g9
call void @foo()
store i32 %val0, i32 *@g0
store i32 %val1, i32 *@g1
store i32 %val2, i32 *@g2
store i32 %val3, i32 *@g3
store i32 %val4, i32 *@g4
store i32 %val5, i32 *@g5
store i32 %val6, i32 *@g6
store i32 %val7, i32 *@g7
store i32 %val8, i32 *@g8
store i32 %val9, i32 *@g9
ret void
}
; Likewise LGRL and STGRL.
define void @f9() {
; CHECK-LABEL: f9:
; CHECK-NOT: mvc
; CHECK: br %r14
%val0 = load i64 *@h0
%val1 = load i64 *@h1
%val2 = load i64 *@h2
%val3 = load i64 *@h3
%val4 = load i64 *@h4
%val5 = load i64 *@h5
%val6 = load i64 *@h6
%val7 = load i64 *@h7
%val8 = load i64 *@h8
%val9 = load i64 *@h9
call void @foo()
store i64 %val0, i64 *@h0
store i64 %val1, i64 *@h1
store i64 %val2, i64 *@h2
store i64 %val3, i64 *@h3
store i64 %val4, i64 *@h4
store i64 %val5, i64 *@h5
store i64 %val6, i64 *@h6
store i64 %val7, i64 *@h7
store i64 %val8, i64 *@h8
store i64 %val9, i64 *@h9
ret void
}
; This showed a problem with the way stack coloring updated instructions.
; The copy from %val9 to %newval8 can be done using an MVC, which then
; has two frame index operands. Stack coloring chose a valid renumbering
; [FI0, FI1] -> [FI1, FI2], but applied it in the form FI0 -> FI1 -> FI2,
; so that both operands ended up being the same.
define void @f10() {
; CHECK-LABEL: f10:
; CHECK: lgrl [[REG:%r[0-9]+]], h9
; CHECK: stg [[REG]], [[VAL9:[0-9]+]](%r15)
; CHECK: brasl %r14, foo@PLT
; CHECK: brasl %r14, foo@PLT
; CHECK: mvc [[NEWVAL8:[0-9]+]](8,%r15), [[VAL9]](%r15)
; CHECK: brasl %r14, foo@PLT
; CHECK: lg [[REG:%r[0-9]+]], [[NEWVAL8]](%r15)
; CHECK: stgrl [[REG]], h8
; CHECK: br %r14
entry:
%val8 = load volatile i64 *@h8
%val0 = load volatile i64 *@h0
%val1 = load volatile i64 *@h1
%val2 = load volatile i64 *@h2
%val3 = load volatile i64 *@h3
%val4 = load volatile i64 *@h4
%val5 = load volatile i64 *@h5
%val6 = load volatile i64 *@h6
%val7 = load volatile i64 *@h7
%val9 = load volatile i64 *@h9
call void @foo()
store volatile i64 %val0, i64 *@h0
store volatile i64 %val1, i64 *@h1
store volatile i64 %val2, i64 *@h2
store volatile i64 %val3, i64 *@h3
store volatile i64 %val4, i64 *@h4
store volatile i64 %val5, i64 *@h5
store volatile i64 %val6, i64 *@h6
store volatile i64 %val7, i64 *@h7
%check = load volatile i64 *@h0
%cond = icmp eq i64 %check, 0
br i1 %cond, label %skip, label %fallthru
fallthru:
call void @foo()
store volatile i64 %val0, i64 *@h0
store volatile i64 %val1, i64 *@h1
store volatile i64 %val2, i64 *@h2
store volatile i64 %val3, i64 *@h3
store volatile i64 %val4, i64 *@h4
store volatile i64 %val5, i64 *@h5
store volatile i64 %val6, i64 *@h6
store volatile i64 %val7, i64 *@h7
store volatile i64 %val8, i64 *@h8
br label %skip
skip:
%newval8 = phi i64 [ %val8, %entry ], [ %val9, %fallthru ]
call void @foo()
store volatile i64 %val0, i64 *@h0
store volatile i64 %val1, i64 *@h1
store volatile i64 %val2, i64 *@h2
store volatile i64 %val3, i64 *@h3
store volatile i64 %val4, i64 *@h4
store volatile i64 %val5, i64 *@h5
store volatile i64 %val6, i64 *@h6
store volatile i64 %val7, i64 *@h7
store volatile i64 %newval8, i64 *@h8
store volatile i64 %val9, i64 *@h9
ret void
}
; This used to generate a no-op MVC. It is very sensitive to spill heuristics.
define void @f11() {
; CHECK-LABEL: f11:
; CHECK-NOT: mvc [[OFFSET:[0-9]+]](8,%r15), [[OFFSET]](%r15)
; CHECK: br %r14
entry:
%val0 = load volatile i64 *@h0
%val1 = load volatile i64 *@h1
%val2 = load volatile i64 *@h2
%val3 = load volatile i64 *@h3
%val4 = load volatile i64 *@h4
%val5 = load volatile i64 *@h5
%val6 = load volatile i64 *@h6
%val7 = load volatile i64 *@h7
%altval0 = load volatile i64 *@h0
%altval1 = load volatile i64 *@h1
call void @foo()
store volatile i64 %val0, i64 *@h0
store volatile i64 %val1, i64 *@h1
store volatile i64 %val2, i64 *@h2
store volatile i64 %val3, i64 *@h3
store volatile i64 %val4, i64 *@h4
store volatile i64 %val5, i64 *@h5
store volatile i64 %val6, i64 *@h6
store volatile i64 %val7, i64 *@h7
%check = load volatile i64 *@h0
%cond = icmp eq i64 %check, 0
br i1 %cond, label %a1, label %b1
a1:
call void @foo()
br label %join1
b1:
call void @foo()
br label %join1
join1:
%newval0 = phi i64 [ %val0, %a1 ], [ %altval0, %b1 ]
call void @foo()
store volatile i64 %val1, i64 *@h1
store volatile i64 %val2, i64 *@h2
store volatile i64 %val3, i64 *@h3
store volatile i64 %val4, i64 *@h4
store volatile i64 %val5, i64 *@h5
store volatile i64 %val6, i64 *@h6
store volatile i64 %val7, i64 *@h7
br i1 %cond, label %a2, label %b2
a2:
call void @foo()
br label %join2
b2:
call void @foo()
br label %join2
join2:
%newval1 = phi i64 [ %val1, %a2 ], [ %altval1, %b2 ]
call void @foo()
store volatile i64 %val2, i64 *@h2
store volatile i64 %val3, i64 *@h3
store volatile i64 %val4, i64 *@h4
store volatile i64 %val5, i64 *@h5
store volatile i64 %val6, i64 *@h6
store volatile i64 %val7, i64 *@h7
call void @foo()
store volatile i64 %newval0, i64 *@h0
store volatile i64 %newval1, i64 *@h1
store volatile i64 %val2, i64 *@h2
store volatile i64 %val3, i64 *@h3
store volatile i64 %val4, i64 *@h4
store volatile i64 %val5, i64 *@h5
store volatile i64 %val6, i64 *@h6
store volatile i64 %val7, i64 *@h7
ret void
}
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