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llvm-6502/test/CodeGen/SystemZ/cond-store-01.ll
Richard Sandiford 6824f127f9 [SystemZ] Be more careful about inverting CC masks 
System z branches have a mask to select which of the 4 CC values should
cause the branch to be taken.  We can invert a branch by inverting the mask.
However, not all instructions can produce all 4 CC values, so inverting
the branch like this can lead to some oddities.  For example, integer
comparisons only produce a CC of 0 (equal), 1 (less) or 2 (greater).
If an integer EQ is reversed to NE before instruction selection,
the branch will test for 1 or 2.  If instead the branch is reversed
after instruction selection (by inverting the mask), it will test for
1, 2 or 3.  Both are correct, but the second isn't really canonical.
This patch therefore keeps track of which CC values are possible
and uses this when inverting a mask.

Although this is mostly cosmestic, it fixes undefined behavior
for the CIJNLH in branch-08.ll.  Another fix would have been
to mask out bit 0 when generating the fused compare and branch,
but the point of this patch is that we shouldn't need to do that
in the first place.

The patch also makes it easier to reuse CC results from other instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187495 91177308-0d34-0410-b5e6-96231b3b80d8
2013-07-31 12:30:20 +00:00

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; Test 8-bit conditional stores that are presented as selects.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
declare void @foo(i8 *)
; Test the simple case, with the loaded value first.
define void @f1(i8 *%ptr, i8 %alt, i32 %limit) {
; CHECK-LABEL: f1:
; CHECK-NOT: %r2
; CHECK: jl [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: stc %r3, 0(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%res = select i1 %cond, i8 %orig, i8 %alt
store i8 %res, i8 *%ptr
ret void
}
; ...and with the loaded value second
define void @f2(i8 *%ptr, i8 %alt, i32 %limit) {
; CHECK-LABEL: f2:
; CHECK-NOT: %r2
; CHECK: jhe [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: stc %r3, 0(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%res = select i1 %cond, i8 %alt, i8 %orig
store i8 %res, i8 *%ptr
ret void
}
; Test cases where the value is explicitly sign-extended to 32 bits, with the
; loaded value first.
define void @f3(i8 *%ptr, i32 %alt, i32 %limit) {
; CHECK-LABEL: f3:
; CHECK-NOT: %r2
; CHECK: jl [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: stc %r3, 0(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%ext = sext i8 %orig to i32
%res = select i1 %cond, i32 %ext, i32 %alt
%trunc = trunc i32 %res to i8
store i8 %trunc, i8 *%ptr
ret void
}
; ...and with the loaded value second
define void @f4(i8 *%ptr, i32 %alt, i32 %limit) {
; CHECK-LABEL: f4:
; CHECK-NOT: %r2
; CHECK: jhe [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: stc %r3, 0(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%ext = sext i8 %orig to i32
%res = select i1 %cond, i32 %alt, i32 %ext
%trunc = trunc i32 %res to i8
store i8 %trunc, i8 *%ptr
ret void
}
; Test cases where the value is explicitly zero-extended to 32 bits, with the
; loaded value first.
define void @f5(i8 *%ptr, i32 %alt, i32 %limit) {
; CHECK-LABEL: f5:
; CHECK-NOT: %r2
; CHECK: jl [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: stc %r3, 0(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%ext = zext i8 %orig to i32
%res = select i1 %cond, i32 %ext, i32 %alt
%trunc = trunc i32 %res to i8
store i8 %trunc, i8 *%ptr
ret void
}
; ...and with the loaded value second
define void @f6(i8 *%ptr, i32 %alt, i32 %limit) {
; CHECK-LABEL: f6:
; CHECK-NOT: %r2
; CHECK: jhe [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: stc %r3, 0(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%ext = zext i8 %orig to i32
%res = select i1 %cond, i32 %alt, i32 %ext
%trunc = trunc i32 %res to i8
store i8 %trunc, i8 *%ptr
ret void
}
; Test cases where the value is explicitly sign-extended to 64 bits, with the
; loaded value first.
define void @f7(i8 *%ptr, i64 %alt, i32 %limit) {
; CHECK-LABEL: f7:
; CHECK-NOT: %r2
; CHECK: jl [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: stc %r3, 0(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%ext = sext i8 %orig to i64
%res = select i1 %cond, i64 %ext, i64 %alt
%trunc = trunc i64 %res to i8
store i8 %trunc, i8 *%ptr
ret void
}
; ...and with the loaded value second
define void @f8(i8 *%ptr, i64 %alt, i32 %limit) {
; CHECK-LABEL: f8:
; CHECK-NOT: %r2
; CHECK: jhe [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: stc %r3, 0(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%ext = sext i8 %orig to i64
%res = select i1 %cond, i64 %alt, i64 %ext
%trunc = trunc i64 %res to i8
store i8 %trunc, i8 *%ptr
ret void
}
; Test cases where the value is explicitly zero-extended to 64 bits, with the
; loaded value first.
define void @f9(i8 *%ptr, i64 %alt, i32 %limit) {
; CHECK-LABEL: f9:
; CHECK-NOT: %r2
; CHECK: jl [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: stc %r3, 0(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%ext = zext i8 %orig to i64
%res = select i1 %cond, i64 %ext, i64 %alt
%trunc = trunc i64 %res to i8
store i8 %trunc, i8 *%ptr
ret void
}
; ...and with the loaded value second
define void @f10(i8 *%ptr, i64 %alt, i32 %limit) {
; CHECK-LABEL: f10:
; CHECK-NOT: %r2
; CHECK: jhe [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: stc %r3, 0(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%ext = zext i8 %orig to i64
%res = select i1 %cond, i64 %alt, i64 %ext
%trunc = trunc i64 %res to i8
store i8 %trunc, i8 *%ptr
ret void
}
; Check the high end of the STC range.
define void @f11(i8 *%base, i8 %alt, i32 %limit) {
; CHECK-LABEL: f11:
; CHECK-NOT: %r2
; CHECK: jl [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: stc %r3, 4095(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%ptr = getelementptr i8 *%base, i64 4095
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%res = select i1 %cond, i8 %orig, i8 %alt
store i8 %res, i8 *%ptr
ret void
}
; Check the next byte up, which should use STCY instead of STC.
define void @f12(i8 *%base, i8 %alt, i32 %limit) {
; CHECK-LABEL: f12:
; CHECK-NOT: %r2
; CHECK: jl [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: stcy %r3, 4096(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%ptr = getelementptr i8 *%base, i64 4096
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%res = select i1 %cond, i8 %orig, i8 %alt
store i8 %res, i8 *%ptr
ret void
}
; Check the high end of the STCY range.
define void @f13(i8 *%base, i8 %alt, i32 %limit) {
; CHECK-LABEL: f13:
; CHECK-NOT: %r2
; CHECK: jl [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: stcy %r3, 524287(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%ptr = getelementptr i8 *%base, i64 524287
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%res = select i1 %cond, i8 %orig, i8 %alt
store i8 %res, i8 *%ptr
ret void
}
; Check the next byte up, which needs separate address logic.
; Other sequences besides this one would be OK.
define void @f14(i8 *%base, i8 %alt, i32 %limit) {
; CHECK-LABEL: f14:
; CHECK-NOT: %r2
; CHECK: jl [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: agfi %r2, 524288
; CHECK: stc %r3, 0(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%ptr = getelementptr i8 *%base, i64 524288
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%res = select i1 %cond, i8 %orig, i8 %alt
store i8 %res, i8 *%ptr
ret void
}
; Check the low end of the STCY range.
define void @f15(i8 *%base, i8 %alt, i32 %limit) {
; CHECK-LABEL: f15:
; CHECK-NOT: %r2
; CHECK: jl [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: stcy %r3, -524288(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%ptr = getelementptr i8 *%base, i64 -524288
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%res = select i1 %cond, i8 %orig, i8 %alt
store i8 %res, i8 *%ptr
ret void
}
; Check the next byte down, which needs separate address logic.
; Other sequences besides this one would be OK.
define void @f16(i8 *%base, i8 %alt, i32 %limit) {
; CHECK-LABEL: f16:
; CHECK-NOT: %r2
; CHECK: jl [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: agfi %r2, -524289
; CHECK: stc %r3, 0(%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%ptr = getelementptr i8 *%base, i64 -524289
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%res = select i1 %cond, i8 %orig, i8 %alt
store i8 %res, i8 *%ptr
ret void
}
; Check that STCY allows an index.
define void @f17(i64 %base, i64 %index, i8 %alt, i32 %limit) {
; CHECK-LABEL: f17:
; CHECK-NOT: %r2
; CHECK: jl [[LABEL:[^ ]*]]
; CHECK-NOT: %r2
; CHECK: stcy %r4, 4096(%r3,%r2)
; CHECK: [[LABEL]]:
; CHECK: br %r14
%add1 = add i64 %base, %index
%add2 = add i64 %add1, 4096
%ptr = inttoptr i64 %add2 to i8 *
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%res = select i1 %cond, i8 %orig, i8 %alt
store i8 %res, i8 *%ptr
ret void
}
; Check that volatile loads are not matched.
define void @f18(i8 *%ptr, i8 %alt, i32 %limit) {
; CHECK-LABEL: f18:
; CHECK: lb {{%r[0-5]}}, 0(%r2)
; CHECK: {{jl|jnl}} [[LABEL:[^ ]*]]
; CHECK: [[LABEL]]:
; CHECK: stc {{%r[0-5]}}, 0(%r2)
; CHECK: br %r14
%cond = icmp ult i32 %limit, 42
%orig = load volatile i8 *%ptr
%res = select i1 %cond, i8 %orig, i8 %alt
store i8 %res, i8 *%ptr
ret void
}
; ...likewise stores. In this case we should have a conditional load into %r3.
define void @f19(i8 *%ptr, i8 %alt, i32 %limit) {
; CHECK-LABEL: f19:
; CHECK: jhe [[LABEL:[^ ]*]]
; CHECK: lb %r3, 0(%r2)
; CHECK: [[LABEL]]:
; CHECK: stc %r3, 0(%r2)
; CHECK: br %r14
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%res = select i1 %cond, i8 %orig, i8 %alt
store volatile i8 %res, i8 *%ptr
ret void
}
; Check that atomic loads are not matched. The transformation is OK for
; the "unordered" case tested here, but since we don't try to handle atomic
; operations at all in this context, it seems better to assert that than
; to restrict the test to a stronger ordering.
define void @f20(i8 *%ptr, i8 %alt, i32 %limit) {
; FIXME: should use a normal load instead of CS.
; CHECK-LABEL: f20:
; CHECK: cs {{%r[0-9]+}},
; CHECK: jl
; CHECK: {{jl|jnl}} [[LABEL:[^ ]*]]
; CHECK: [[LABEL]]:
; CHECK: stc {{%r[0-9]+}},
; CHECK: br %r14
%cond = icmp ult i32 %limit, 42
%orig = load atomic i8 *%ptr unordered, align 1
%res = select i1 %cond, i8 %orig, i8 %alt
store i8 %res, i8 *%ptr
ret void
}
; ...likewise stores.
define void @f21(i8 *%ptr, i8 %alt, i32 %limit) {
; FIXME: should use a normal store instead of CS.
; CHECK-LABEL: f21:
; CHECK: jhe [[LABEL:[^ ]*]]
; CHECK: lb %r3, 0(%r2)
; CHECK: [[LABEL]]:
; CHECK: cs {{%r[0-9]+}},
; CHECK: br %r14
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%res = select i1 %cond, i8 %orig, i8 %alt
store atomic i8 %res, i8 *%ptr unordered, align 1
ret void
}
; Try a frame index base.
define void @f22(i8 %alt, i32 %limit) {
; CHECK-LABEL: f22:
; CHECK: brasl %r14, foo@PLT
; CHECK-NOT: %r15
; CHECK: jl [[LABEL:[^ ]*]]
; CHECK-NOT: %r15
; CHECK: stc {{%r[0-9]+}}, {{[0-9]+}}(%r15)
; CHECK: [[LABEL]]:
; CHECK: brasl %r14, foo@PLT
; CHECK: br %r14
%ptr = alloca i8
call void @foo(i8 *%ptr)
%cond = icmp ult i32 %limit, 42
%orig = load i8 *%ptr
%res = select i1 %cond, i8 %orig, i8 %alt
store i8 %res, i8 *%ptr
call void @foo(i8 *%ptr)
ret void
}
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