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| author | Evan Cheng <evan.cheng@apple.com> | 2012-01-10 02:02:58 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2012-01-10 02:02:58 +0000 |
| commit | 0be4144a680be543eae933a21806f94eacd7199d (patch) | |
| tree | 0832a50cdb11cdf1c019e8371ff9792e7abbf80f /llvm/test/CodeGen/X86 | |
| parent | d5d2db9af9081582e97ad9595957748eb7f08ff8 (diff) | |
| download | bcm5719-llvm-0be4144a680be543eae933a21806f94eacd7199d.tar.gz bcm5719-llvm-0be4144a680be543eae933a21806f94eacd7199d.zip | |
Allow machine-cse to look across MBB boundary when cse'ing instructions that
define physical registers. It's currently very restrictive, only catching
cases where the CE is in an immediate (and only) predecessor. But it catches
a surprising large number of cases.
rdar://10660865
llvm-svn: 147827
Diffstat (limited to 'llvm/test/CodeGen/X86')
| -rw-r--r-- | llvm/test/CodeGen/X86/machine-cse.ll | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/llvm/test/CodeGen/X86/machine-cse.ll b/llvm/test/CodeGen/X86/machine-cse.ll index d819fc8f6ec..a757cde6abe 100644 --- a/llvm/test/CodeGen/X86/machine-cse.ll +++ b/llvm/test/CodeGen/X86/machine-cse.ll @@ -1,4 +1,4 @@ -; RUN: llc -mtriple=x86_64-apple-darwin < %s | FileCheck %s +; RUN: llc -mtriple=x86_64-apple-macosx < %s | FileCheck %s ; rdar://7610418 %ptr = type { i8* } @@ -77,3 +77,25 @@ bb.nph743.us: ; preds = %for.body53.us, %if. sw.bb307: ; preds = %sw.bb, %entry ret void } + +; CSE physical register defining instruction across MBB boundary. +; rdar://10660865 +define i32 @cross_mbb_phys_cse(i32 %a, i32 %b) nounwind ssp { +entry: +; CHECK: cross_mbb_phys_cse: +; CHECK: cmpl +; CHECK: ja + %cmp = icmp ugt i32 %a, %b + br i1 %cmp, label %return, label %if.end + +if.end: ; preds = %entry +; CHECK-NOT: cmpl +; CHECK: sbbl + %cmp1 = icmp ult i32 %a, %b + %. = sext i1 %cmp1 to i32 + br label %return + +return: ; preds = %if.end, %entry + %retval.0 = phi i32 [ 1, %entry ], [ %., %if.end ] + ret i32 %retval.0 +} |
