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[SystemZ] Extend integer absolute selection

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This patch makes more use of LPGFR and LNGFR.  It builds on top of
the LTGFR selection from r197234.  Most of the tests are motivated
by what InstCombine would produce.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197236 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Sandiford
2013-12-13 15:35:00 +00:00
parent 467a3f9b3f
commit 193bf3171f
6 changed files with 252 additions and 4 deletions
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133
test/CodeGen/SystemZ/int-neg-02.ll
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@@ -89,3 +89,136 @@ define i64 @f7(i64 %val) {
%res = sub i64 0, %abs
ret i64 %res
}
; Test another form of f6, which is that produced by InstCombine.
define i64 @f8(i64 %val) {
; CHECK-LABEL: f8:
; CHECK: lngfr %r2, %r2
; CHECK: br %r14
%shl = shl i64 %val, 32
%ashr = ashr i64 %shl, 32
%neg = sub i64 0, %ashr
%cmp = icmp slt i64 %shl, 0
%abs = select i1 %cmp, i64 %neg, i64 %ashr
%res = sub i64 0, %abs
ret i64 %res
}
; Try again with sle rather than slt.
define i64 @f9(i64 %val) {
; CHECK-LABEL: f9:
; CHECK: lngfr %r2, %r2
; CHECK: br %r14
%shl = shl i64 %val, 32
%ashr = ashr i64 %shl, 32
%neg = sub i64 0, %ashr
%cmp = icmp sle i64 %shl, 0
%abs = select i1 %cmp, i64 %neg, i64 %ashr
%res = sub i64 0, %abs
ret i64 %res
}
; Repeat f8 with the operands reversed.
define i64 @f10(i64 %val) {
; CHECK-LABEL: f10:
; CHECK: lngfr %r2, %r2
; CHECK: br %r14
%shl = shl i64 %val, 32
%ashr = ashr i64 %shl, 32
%neg = sub i64 0, %ashr
%cmp = icmp sgt i64 %shl, 0
%abs = select i1 %cmp, i64 %ashr, i64 %neg
%res = sub i64 0, %abs
ret i64 %res
}
; Try again with sge rather than sgt.
define i64 @f11(i64 %val) {
; CHECK-LABEL: f11:
; CHECK: lngfr %r2, %r2
; CHECK: br %r14
%shl = shl i64 %val, 32
%ashr = ashr i64 %shl, 32
%neg = sub i64 0, %ashr
%cmp = icmp sge i64 %shl, 0
%abs = select i1 %cmp, i64 %ashr, i64 %neg
%res = sub i64 0, %abs
ret i64 %res
}
; Repeat f8 with the negation coming from swapped operands.
define i64 @f12(i64 %val) {
; CHECK-LABEL: f12:
; CHECK: lngfr %r2, %r2
; CHECK: br %r14
%shl = shl i64 %val, 32
%ashr = ashr i64 %shl, 32
%neg = sub i64 0, %ashr
%cmp = icmp slt i64 %shl, 0
%negabs = select i1 %cmp, i64 %ashr, i64 %neg
ret i64 %negabs
}
; Likewise f9.
define i64 @f13(i64 %val) {
; CHECK-LABEL: f13:
; CHECK: lngfr %r2, %r2
; CHECK: br %r14
%shl = shl i64 %val, 32
%ashr = ashr i64 %shl, 32
%neg = sub i64 0, %ashr
%cmp = icmp sle i64 %shl, 0
%negabs = select i1 %cmp, i64 %ashr, i64 %neg
ret i64 %negabs
}
; Likewise f10.
define i64 @f14(i64 %val) {
; CHECK-LABEL: f14:
; CHECK: lngfr %r2, %r2
; CHECK: br %r14
%shl = shl i64 %val, 32
%ashr = ashr i64 %shl, 32
%neg = sub i64 0, %ashr
%cmp = icmp sgt i64 %shl, 0
%negabs = select i1 %cmp, i64 %neg, i64 %ashr
ret i64 %negabs
}
; Likewise f11.
define i64 @f15(i64 %val) {
; CHECK-LABEL: f15:
; CHECK: lngfr %r2, %r2
; CHECK: br %r14
%shl = shl i64 %val, 32
%ashr = ashr i64 %shl, 32
%neg = sub i64 0, %ashr
%cmp = icmp sge i64 %shl, 0
%negabs = select i1 %cmp, i64 %neg, i64 %ashr
ret i64 %negabs
}
; Repeat f5 with the comparison on the unextended value.
define i64 @f16(i32 %val) {
; CHECK-LABEL: f16:
; CHECK: lngfr %r2, %r2
; CHECK: br %r14
%ext = sext i32 %val to i64
%cmp = icmp slt i32 %val, 0
%neg = sub i64 0, %ext
%abs = select i1 %cmp, i64 %neg, i64 %ext
%res = sub i64 0, %abs
ret i64 %res
}
; And again with the negation coming from swapped operands.
define i64 @f17(i32 %val) {
; CHECK-LABEL: f17:
; CHECK: lngfr %r2, %r2
; CHECK: br %r14
%ext = sext i32 %val to i64
%cmp = icmp slt i32 %val, 0
%neg = sub i64 0, %ext
%abs = select i1 %cmp, i64 %ext, i64 %neg
ret i64 %abs
}