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Fix an edge case involving branches in fast-isel on x86.

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rdar://problem/9303306 .



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130272 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2011-04-27 01:34:27 +00:00
parent 3f95c88162
commit 547eb4fd56
2 changed files with 34 additions and 11 deletions
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6
lib/Target/X86/X86FastISel.cpp
View File

@ -1098,11 +1098,13 @@ bool X86FastISel::X86SelectBranch(const Instruction *I) {
}
// Otherwise do a clumsy setcc and re-test it.
// Note that i1 essentially gets ANY_EXTEND'ed to i8 where it isn't used
// in an explicit cast, so make sure to handle that correctly.
unsigned OpReg = getRegForValue(BI->getCondition());
if (OpReg == 0) return false;
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(X86::TEST8rr))
.addReg(OpReg).addReg(OpReg);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(X86::TEST8ri))
.addReg(OpReg).addImm(1);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(X86::JNE_4))
.addMBB(TrueMBB);
FastEmitBranch(FalseMBB, DL);

39
test/CodeGen/X86/fast-isel-i1.ll
View File

@ -1,19 +1,40 @@
; RUN: llc < %s -march=x86 -fast-isel | grep {andb \$1, %}
; RUN: llc < %s -march=x86 -fast-isel | FileCheck %s
declare i64 @bar(i64)
declare i64 @test1a(i64)
define i32 @foo(i64 %x) nounwind {
%y = add i64 %x, -3 ; <i64> [#uses=1]
%t = call i64 @bar(i64 %y) ; <i64> [#uses=1]
%s = mul i64 %t, 77 ; <i64> [#uses=1]
%z = trunc i64 %s to i1 ; <i1> [#uses=1]
define i32 @test1(i64 %x) nounwind {
; CHECK: test1:
; CHECK: andb $1, %
%y = add i64 %x, -3
%t = call i64 @test1a(i64 %y)
%s = mul i64 %t, 77
%z = trunc i64 %s to i1
br label %next
next: ; preds = %0
%u = zext i1 %z to i32 ; <i32> [#uses=1]
%v = add i32 %u, 1999 ; <i32> [#uses=1]
%u = zext i1 %z to i32
%v = add i32 %u, 1999
br label %exit
exit: ; preds = %next
ret i32 %v
}
define void @test2(i8* %a) nounwind {
entry:
; CHECK: test2:
; CHECK: movb {{.*}} %al
; CHECK-NEXT: xorb $1, %al
; CHECK-NEXT: testb $1
%tmp = load i8* %a, align 1
%tobool = trunc i8 %tmp to i1
%tobool2 = xor i1 %tobool, true
br i1 %tobool2, label %if.then, label %if.end
if.then:
call void @test2(i8* null)
br label %if.end
if.end:
ret void
}