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| author | Evan Cheng <evan.cheng@apple.com> | 2008-09-11 20:07:10 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2008-09-11 20:07:10 +0000 |
| commit | 8db866808c803f9bdcd45c56a042fedd8cccd5bc (patch) | |
| tree | 0616d920ec6af7dc1ea68c275f8065140b736e13 /test | |
| parent | ac34a00fe0784cd6efc466f03f93ab1017fa9726 (diff) | |
| download | llvm-8db866808c803f9bdcd45c56a042fedd8cccd5bc.tar.gz llvm-8db866808c803f9bdcd45c56a042fedd8cccd5bc.tar.bz2 llvm-8db866808c803f9bdcd45c56a042fedd8cccd5bc.tar.xz | |
Fix PR2748. Avoid coalescing physical register with virtual register which would create illegal extract_subreg. e.g.
vr1024 = extract_subreg vr1025, 1
...
vr1024 = mov8rr AH
If vr1024 is coalesced with AH, the extract_subreg is now illegal since AH does not have a super-reg whose sub-register 1 is AH.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56118 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/CodeGen/X86/2008-09-11-CoalescerBug2.ll | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2008-09-11-CoalescerBug2.ll b/test/CodeGen/X86/2008-09-11-CoalescerBug2.ll new file mode 100644 index 0000000000..9403344911 --- /dev/null +++ b/test/CodeGen/X86/2008-09-11-CoalescerBug2.ll @@ -0,0 +1,33 @@ +; RUN: llvm-as < %s | llc -march=x86 +; PR2748 + +@g_73 = external global i32 ; <i32*> [#uses=1] +@g_5 = external global i32 ; <i32*> [#uses=1] + +define i32 @func_44(i16 signext %p_46) nounwind { +entry: + %0 = load i32* @g_5, align 4 ; <i32> [#uses=1] + %1 = ashr i32 %0, 1 ; <i32> [#uses=1] + %2 = icmp sgt i32 %1, 1 ; <i1> [#uses=1] + %3 = zext i1 %2 to i32 ; <i32> [#uses=1] + %4 = load i32* @g_73, align 4 ; <i32> [#uses=1] + %5 = zext i16 %p_46 to i64 ; <i64> [#uses=1] + %6 = sub i64 0, %5 ; <i64> [#uses=1] + %7 = trunc i64 %6 to i8 ; <i8> [#uses=2] + %8 = trunc i32 %4 to i8 ; <i8> [#uses=2] + %9 = icmp eq i8 %8, 0 ; <i1> [#uses=1] + br i1 %9, label %bb11, label %bb12 + +bb11: ; preds = %entry + %10 = urem i8 %7, %8 ; <i8> [#uses=1] + br label %bb12 + +bb12: ; preds = %bb11, %entry + %.014.in = phi i8 [ %10, %bb11 ], [ %7, %entry ] ; <i8> [#uses=1] + %11 = icmp ne i8 %.014.in, 0 ; <i1> [#uses=1] + %12 = zext i1 %11 to i32 ; <i32> [#uses=1] + %13 = tail call i32 (...)* @func_48( i32 %12, i32 %3, i32 0 ) nounwind ; <i32> [#uses=0] + ret i32 undef +} + +declare i32 @func_48(...) |