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author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-11-09 01:06:56 +0000 |
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committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-11-09 01:06:56 +0000 |
commit | f4c4768fb2277cb940a90cb2f0e9a747ebc671c3 (patch) | |
tree | b98651084e6e09a4538358964fbbb7f1b87dfeb3 /test | |
parent | dbc372f47e3a77343e6ef1ab4a88bc46f532f774 (diff) | |
download | external_llvm-f4c4768fb2277cb940a90cb2f0e9a747ebc671c3.zip external_llvm-f4c4768fb2277cb940a90cb2f0e9a747ebc671c3.tar.gz external_llvm-f4c4768fb2277cb940a90cb2f0e9a747ebc671c3.tar.bz2 |
Collapse DomainValues across loop back-edges.
During the initial RPO traversal of the basic blocks, remember the ones
that are incomplete because of back-edges from predecessors that haven't
been visited yet.
After the initial RPO, revisit all those loop headers so the incoming
DomainValues on the back-edges can be properly collapsed.
This will properly fix execution domains on software pipelined code,
like the included test case.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144151 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
-rw-r--r-- | test/CodeGen/X86/sse-domains.ll | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/test/CodeGen/X86/sse-domains.ll b/test/CodeGen/X86/sse-domains.ll new file mode 100644 index 0000000..d26d322 --- /dev/null +++ b/test/CodeGen/X86/sse-domains.ll @@ -0,0 +1,45 @@ +; RUN: llc < %s | FileCheck %s +target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" +target triple = "x86_64-apple-macosx10.7" + +; CHECK: f +; +; This function contains load / store / and operations that all can execute in +; any domain. The only domain-specific operation is the %add = shl... operation +; which is <4 x i32>. +; +; The paddd instruction can only influence the other operations through the loop +; back-edge. Check that everything is still moved into the integer domain. + +define void @f(<4 x i32>* nocapture %p, i32 %n) nounwind uwtable ssp { +entry: + br label %while.body + +; Materialize a zeroinitializer and a constant-pool load in the integer domain. +; The order is not important. +; CHECK: pxor +; CHECK: movdqa + +; The instructions in the loop must all be integer domain as well. +; CHECK: while.body +; CHECK: pand +; CHECK: movdqa +; CHECK: movdqa +; Finally, the controlling integer-only instruction. +; CHECK: paddd +while.body: + %p.addr.04 = phi <4 x i32>* [ %incdec.ptr, %while.body ], [ %p, %entry ] + %n.addr.03 = phi i32 [ %dec, %while.body ], [ %n, %entry ] + %x.02 = phi <4 x i32> [ %add, %while.body ], [ zeroinitializer, %entry ] + %dec = add nsw i32 %n.addr.03, -1 + %and = and <4 x i32> %x.02, <i32 127, i32 127, i32 127, i32 127> + %incdec.ptr = getelementptr inbounds <4 x i32>* %p.addr.04, i64 1 + store <4 x i32> %and, <4 x i32>* %p.addr.04, align 16 + %0 = load <4 x i32>* %incdec.ptr, align 16 + %add = shl <4 x i32> %0, <i32 1, i32 1, i32 1, i32 1> + %tobool = icmp eq i32 %dec, 0 + br i1 %tobool, label %while.end, label %while.body + +while.end: + ret void +} |