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author | Richard Sandiford <rsandifo@linux.vnet.ibm.com> | 2013-07-31 12:58:26 +0000 |
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committer | Richard Sandiford <rsandifo@linux.vnet.ibm.com> | 2013-07-31 12:58:26 +0000 |
commit | 04ded924f3583438c6633823eddb87761fa73cce (patch) | |
tree | b79b516513939f4d5517ef0b1c7ef1ea222129ee /test/CodeGen/SystemZ | |
parent | 15715fb689a5c7a2476c943a7b06616bd6d67d5e (diff) | |
download | llvm-04ded924f3583438c6633823eddb87761fa73cce.tar.gz llvm-04ded924f3583438c6633823eddb87761fa73cce.tar.bz2 llvm-04ded924f3583438c6633823eddb87761fa73cce.tar.xz |
[SystemZ] Implement isLegalAddressingMode()
The loop optimizers were assuming that scales > 1 were OK. I think this
is actually a bug in TargetLoweringBase::isLegalAddressingMode(),
since it seems to be trying to reject anything that isn't r+i or r+r,
but it has no default case for scales other than 0, 1 or 2. Implementing
the hook for z means that z can no longer test any change there though.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187497 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/SystemZ')
-rw-r--r-- | test/CodeGen/SystemZ/loop-01.ll | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/test/CodeGen/SystemZ/loop-01.ll b/test/CodeGen/SystemZ/loop-01.ll new file mode 100644 index 0000000000..025a34eaf5 --- /dev/null +++ b/test/CodeGen/SystemZ/loop-01.ll @@ -0,0 +1,25 @@ +; Test loop tuning. +; +; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z10 | FileCheck %s + +; Test that strength reduction is applied to addresses with a scale factor, +; but that indexed addressing can still be used. +define void @f1(i32 *%dest, i32 %a) { +; CHECK-LABEL: f1 +; CHECK-NOT: sllg +; CHECK: st %r3, 0({{%r[1-5],%r[1-5]}}) +; CHECK: br %r14 +entry: + br label %loop + +loop: + %index = phi i64 [ 0, %entry ], [ %next, %loop ] + %ptr = getelementptr i32 *%dest, i64 %index + store i32 %a, i32 *%ptr + %next = add i64 %index, 1 + %cmp = icmp ne i64 %next, 100 + br i1 %cmp, label %loop, label %exit + +exit: + ret void +} |