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llvm-mirror/test/CodeGen/PowerPC/sj-ctr-loop.ll
Hal Finkel 149f358122 PPC: Add CTR-register clobber to builtin setjmp
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.

llvm-svn: 186488
2013-07-17 05:35:44 +00:00

51 lines
1.8 KiB
LLVM

; RUN: llc -mtriple=powerpc64-unknown-linux-gnu < %s | FileCheck %s
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"
target triple = "powerpc64-unknown-linux-gnu"
%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] }
%struct.__sigset_t.0.14.16.20.24.48.52.54 = type { [16 x i64] }
@env_sigill = external global [1 x %struct.__jmp_buf_tag.1.15.17.21.25.49.53.55], align 16
; CHECK-LABEL: @main
; CHECK-NOT: mtctr
; Function Attrs: nounwind
define void @main() #0 {
entry:
br i1 undef, label %return, label %if.end
if.end: ; preds = %entry
br i1 undef, label %for.body.lr.ph, label %for.end.thread
for.end.thread: ; preds = %if.end
br label %return
for.body.lr.ph: ; preds = %if.end
br label %for.body
for.cond: ; preds = %for.body
%cmp2 = icmp slt i32 %inc, undef
br i1 %cmp2, label %for.body, label %for.end
for.body: ; preds = %for.cond, %for.body.lr.ph
%i.032 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.cond ]
%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*))
%inc = add nsw i32 %i.032, 1
br i1 false, label %if.else, label %for.cond
if.else: ; preds = %for.body
unreachable
for.end: ; preds = %for.cond
unreachable
return: ; preds = %for.end.thread, %entry
ret void
}
; Function Attrs: nounwind
declare i32 @llvm.eh.sjlj.setjmp(i8*) #0
attributes #0 = { nounwind }