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Fix an edge case involving branches in fast-isel on x86.
rdar://problem/9303306 . git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130272 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1098,11 +1098,13 @@ bool X86FastISel::X86SelectBranch(const Instruction *I) {
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}
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// Otherwise do a clumsy setcc and re-test it.
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// Note that i1 essentially gets ANY_EXTEND'ed to i8 where it isn't used
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// in an explicit cast, so make sure to handle that correctly.
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unsigned OpReg = getRegForValue(BI->getCondition());
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if (OpReg == 0) return false;
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BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(X86::TEST8rr))
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.addReg(OpReg).addReg(OpReg);
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BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(X86::TEST8ri))
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.addReg(OpReg).addImm(1);
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BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(X86::JNE_4))
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.addMBB(TrueMBB);
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FastEmitBranch(FalseMBB, DL);
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@ -1,19 +1,40 @@
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; RUN: llc < %s -march=x86 -fast-isel | grep {andb \$1, %}
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; RUN: llc < %s -march=x86 -fast-isel | FileCheck %s
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declare i64 @bar(i64)
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declare i64 @test1a(i64)
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define i32 @foo(i64 %x) nounwind {
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%y = add i64 %x, -3 ; <i64> [#uses=1]
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%t = call i64 @bar(i64 %y) ; <i64> [#uses=1]
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%s = mul i64 %t, 77 ; <i64> [#uses=1]
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%z = trunc i64 %s to i1 ; <i1> [#uses=1]
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define i32 @test1(i64 %x) nounwind {
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; CHECK: test1:
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; CHECK: andb $1, %
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%y = add i64 %x, -3
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%t = call i64 @test1a(i64 %y)
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%s = mul i64 %t, 77
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%z = trunc i64 %s to i1
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br label %next
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next: ; preds = %0
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%u = zext i1 %z to i32 ; <i32> [#uses=1]
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%v = add i32 %u, 1999 ; <i32> [#uses=1]
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%u = zext i1 %z to i32
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%v = add i32 %u, 1999
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br label %exit
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exit: ; preds = %next
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ret i32 %v
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}
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define void @test2(i8* %a) nounwind {
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entry:
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; CHECK: test2:
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; CHECK: movb {{.*}} %al
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; CHECK-NEXT: xorb $1, %al
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; CHECK-NEXT: testb $1
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%tmp = load i8* %a, align 1
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%tobool = trunc i8 %tmp to i1
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%tobool2 = xor i1 %tobool, true
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br i1 %tobool2, label %if.then, label %if.end
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if.then:
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call void @test2(i8* null)
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br label %if.end
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if.end:
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ret void
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}
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