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8d7435e9b1
Because the builtin longjmp implementation uses a CTR-based indirect jump, when the control flow arrives at the builtin setjmp call, the CTR register has necessarily been clobbered. Correspondingly, this adds CTR to the list of implicit definitions of the builtin setjmp pseudo instruction. We don't need to add CTR to the implicit definitions of builtin longjmp because, even though it does clobber the CTR register, the control flow cannot return to inside the loop unless there is also a builtin setjmp call. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186488 91177308-0d34-0410-b5e6-96231b3b80d8
51 lines
1.8 KiB
LLVM
51 lines
1.8 KiB
LLVM
; RUN: llc -mtriple=powerpc64-unknown-linux-gnu < %s | FileCheck %s
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target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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%struct.__jmp_buf_tag.1.15.17.21.25.49.53.55 = type { [64 x i64], i32, %struct.__sigset_t.0.14.16.20.24.48.52.54, [8 x i8] }
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%struct.__sigset_t.0.14.16.20.24.48.52.54 = type { [16 x i64] }
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@env_sigill = external global [1 x %struct.__jmp_buf_tag.1.15.17.21.25.49.53.55], align 16
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; CHECK-LABEL: @main
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; CHECK-NOT: mtctr
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; Function Attrs: nounwind
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define void @main() #0 {
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entry:
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br i1 undef, label %return, label %if.end
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if.end: ; preds = %entry
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br i1 undef, label %for.body.lr.ph, label %for.end.thread
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for.end.thread: ; preds = %if.end
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br label %return
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for.body.lr.ph: ; preds = %if.end
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br label %for.body
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for.cond: ; preds = %for.body
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%cmp2 = icmp slt i32 %inc, undef
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br i1 %cmp2, label %for.body, label %for.end
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for.body: ; preds = %for.cond, %for.body.lr.ph
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%i.032 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.cond ]
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%0 = call i32 @llvm.eh.sjlj.setjmp(i8* bitcast ([1 x %struct.__jmp_buf_tag.1.15.17.21.25.49.53.55]* @env_sigill to i8*))
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%inc = add nsw i32 %i.032, 1
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br i1 false, label %if.else, label %for.cond
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if.else: ; preds = %for.body
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unreachable
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for.end: ; preds = %for.cond
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unreachable
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return: ; preds = %for.end.thread, %entry
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ret void
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}
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; Function Attrs: nounwind
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declare i32 @llvm.eh.sjlj.setjmp(i8*) #0
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attributes #0 = { nounwind }
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