[llvm] r330193 - Revert "Fix incorrect choice of callee-saved registers save/restore points (take 2)"

[Momchil Velikov via llvm-commits]

Author: chill
Date: Tue Apr 17 09:29:58 2018
New Revision: 330193

URL: http://llvm.org/viewvc/llvm-project?rev=330193&view=rev
Log:
Revert "Fix incorrect choice of callee-saved registers save/restore points (take 2)"

Revert in order to fix the test to not run when required targets aren't
configured.



Removed:
    llvm/trunk/test/CodeGen/Generic/shrink-wrapping-vla.ll

Removed: llvm/trunk/test/CodeGen/Generic/shrink-wrapping-vla.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/Generic/shrink-wrapping-vla.ll?rev=330192&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/Generic/shrink-wrapping-vla.ll (original)
+++ llvm/trunk/test/CodeGen/Generic/shrink-wrapping-vla.ll (removed)
@@ -1,114 +0,0 @@
-; Test shrink wrapping placement is correct with respect to calls to llvm.{stacksave,stackrestore}
-
-; void f(int n, int x[]) {
-;   if (n < 0)
-;     return;
-;
-;  int a[n];
-;
-;  for (int i = 0; i < n; i++)
-;    a[i] = x[n - i - 1];
-;
-;  for (int i = 0; i < n; i++)
-;    x[i] = a[i] + 1;
-; }
-;
-; RUN: llc -mtriple aarch64-eabi %s -o - | FileCheck %s --check-prefix=CHECK-ARM
-; RUN: llc -mtriple x86_64-linux %s -o - | FileCheck %s --check-prefix=CHECK-X86
-
-
-define dso_local void @f(i32 %n, i32* nocapture %x) local_unnamed_addr #0 {
-entry:
-  %cmp = icmp slt i32 %n, 0
-  br i1 %cmp, label %return, label %if.end
-
-if.end:                                           ; preds = %entry
-  %0 = zext i32 %n to i64
-  %1 = tail call i8* @llvm.stacksave()
-  %vla = alloca i32, i64 %0, align 16
-  %cmp132 = icmp eq i32 %n, 0
-  br i1 %cmp132, label %for.cond.cleanup8, label %for.body.lr.ph
-
-for.body.lr.ph:                                   ; preds = %if.end
-  %sub = add i32 %n, -1
-  br label %for.body
-
-for.cond6.preheader:                              ; preds = %for.body
-  %cmp730 = icmp sgt i32 %n, 0
-  br i1 %cmp730, label %for.body9, label %for.cond.cleanup8
-
-for.body:                                         ; preds = %for.body, %for.body.lr.ph
-  %indvars.iv34 = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next35, %for.body ]
-  %2 = trunc i64 %indvars.iv34 to i32
-  %sub2 = sub i32 %sub, %2
-  %idxprom = sext i32 %sub2 to i64
-  %arrayidx = getelementptr inbounds i32, i32* %x, i64 %idxprom
-  %3 = load i32, i32* %arrayidx, align 4
-  %arrayidx4 = getelementptr inbounds i32, i32* %vla, i64 %indvars.iv34
-  store i32 %3, i32* %arrayidx4, align 4
-  %indvars.iv.next35 = add nuw nsw i64 %indvars.iv34, 1
-  %exitcond37 = icmp eq i64 %indvars.iv.next35, %0
-  br i1 %exitcond37, label %for.cond6.preheader, label %for.body
-
-for.cond.cleanup8:                                ; preds = %for.body9, %if.end, %for.cond6.preheader
-  tail call void @llvm.stackrestore(i8* %1)
-  br label %return
-
-for.body9:                                        ; preds = %for.cond6.preheader, %for.body9
-  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body9 ], [ 0, %for.cond6.preheader ]
-  %arrayidx11 = getelementptr inbounds i32, i32* %vla, i64 %indvars.iv
-  %4 = load i32, i32* %arrayidx11, align 4
-  %add = add nsw i32 %4, 1
-  %arrayidx13 = getelementptr inbounds i32, i32* %x, i64 %indvars.iv
-  store i32 %add, i32* %arrayidx13, align 4
-  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
-  %exitcond = icmp eq i64 %indvars.iv.next, %0
-  br i1 %exitcond, label %for.cond.cleanup8, label %for.body9
-
-return:                                           ; preds = %entry, %for.cond.cleanup8
-  ret void
-}
-
-; Function Attrs: nounwind
-declare i8* @llvm.stacksave() #1
-
-; Function Attrs: nounwind
-declare void @llvm.stackrestore(i8*) #1
-
-; Check that llvm.stackrestore() happens before CSRs are popped off the stack
-
-; CHECK-LABEL: f
-
-; CHECK-ARM:      stp x29, x30, [sp, #-16]!
-; CHECK-ARM-NEXT: mov x29, sp
-
-; VLA allocation
-; CHECK-ARM: add [[X1:x[0-9]+]], [[X1]], #15
-; CHECK-ARM: mov [[X2:x[0-9]+]], sp
-; CHECK-ARM: and [[X1]], [[X1]], #0x7fffffff0
-; Saving the SP via llvm.stacksave()
-; CHECK-ARM: mov [[SAVE:x[0-9]+]], sp
-; CHECK-ARM: sub [[X2]], [[X2]], [[X1]]
-
-; The next instruction comes from llvm.stackrestore()
-; CHECK-ARM:      mov sp, [[SAVE]]
-; Epilogue
-; CHECK-ARM-NEXT: mov sp, x29
-; CHECK-ARM-NEXT: ldp x29, x30, [sp], #16
-
-
-; CHECK-X86: pushq %rbp
-; CHECK-X86: movq %rsp, %rbp
-
-; Saving the SP via llvm.stacksave()
-; CHECK-X86: movq %rsp, [[SAVE:%r[a-z0-9]+]]
-; VLA allocation
-; CHECK-X86: movq %rsp, [[TMP:%r[a-z0-9]+]]
-; CHECK-X86: subq %r{{[a-z0-9]+}}, [[TMP]]
-; CHECK-X86: movq [[TMP]], %rsp
-
-; The next instruction comes from llvm.stackrestore()
-; CHECK-X86:      movq [[SAVE]], %rsp
-; Epilogue
-; CHECK-X86-NEXT: movq %rbp, %rsp
-; CHECK-X86-NEXT: popq %rbp