From 8db866808c803f9bdcd45c56a042fedd8cccd5bc Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Thu, 11 Sep 2008 20:07:10 +0000 Subject: 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 --- test/CodeGen/X86/2008-09-11-CoalescerBug2.ll | 33 ++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 test/CodeGen/X86/2008-09-11-CoalescerBug2.ll (limited to 'test') 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 ; [#uses=1] +@g_5 = external global i32 ; [#uses=1] + +define i32 @func_44(i16 signext %p_46) nounwind { +entry: + %0 = load i32* @g_5, align 4 ; [#uses=1] + %1 = ashr i32 %0, 1 ; [#uses=1] + %2 = icmp sgt i32 %1, 1 ; [#uses=1] + %3 = zext i1 %2 to i32 ; [#uses=1] + %4 = load i32* @g_73, align 4 ; [#uses=1] + %5 = zext i16 %p_46 to i64 ; [#uses=1] + %6 = sub i64 0, %5 ; [#uses=1] + %7 = trunc i64 %6 to i8 ; [#uses=2] + %8 = trunc i32 %4 to i8 ; [#uses=2] + %9 = icmp eq i8 %8, 0 ; [#uses=1] + br i1 %9, label %bb11, label %bb12 + +bb11: ; preds = %entry + %10 = urem i8 %7, %8 ; [#uses=1] + br label %bb12 + +bb12: ; preds = %bb11, %entry + %.014.in = phi i8 [ %10, %bb11 ], [ %7, %entry ] ; [#uses=1] + %11 = icmp ne i8 %.014.in, 0 ; [#uses=1] + %12 = zext i1 %11 to i32 ; [#uses=1] + %13 = tail call i32 (...)* @func_48( i32 %12, i32 %3, i32 0 ) nounwind ; [#uses=0] + ret i32 undef +} + +declare i32 @func_48(...) -- cgit v1.2.3