-; RUN: llc %s -o - -enable-shrink-wrap=true | FileCheck %s --check-prefix=CHECK --check-prefix=ENABLE
-; RUN: llc %s -o - -enable-shrink-wrap=false | FileCheck %s --check-prefix=CHECK --check-prefix=DISABLE
+; RUN: llc %s -o - -enable-shrink-wrap=true -disable-post-ra | FileCheck %s --check-prefix=CHECK --check-prefix=ENABLE
+; RUN: llc %s -o - -enable-shrink-wrap=false -disable-post-ra | FileCheck %s --check-prefix=CHECK --check-prefix=DISABLE
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "arm64-apple-ios"
if.end:
ret void
}
+
+; Another infinite loop test this time with a body bigger than just one block.
+; CHECK-LABEL: infiniteloop2
+; CHECK: ret
+define void @infiniteloop2() {
+entry:
+ br i1 undef, label %if.then, label %if.end
+
+if.then:
+ %ptr = alloca i32, i32 4
+ br label %for.body
+
+for.body: ; preds = %for.body, %entry
+ %sum.03 = phi i32 [ 0, %if.then ], [ %add, %body1 ], [ 1, %body2]
+ %call = tail call i32 asm "mov $0, #0", "=r,~{x19}"()
+ %add = add nsw i32 %call, %sum.03
+ store i32 %add, i32* %ptr
+ br i1 undef, label %body1, label %body2
+
+body1:
+ tail call void asm sideeffect "nop", "~{x19}"()
+ br label %for.body
+
+body2:
+ tail call void asm sideeffect "nop", "~{x19}"()
+ br label %for.body
+
+if.end:
+ ret void
+}
+
+; Another infinite loop test this time with two nested infinite loop.
+; CHECK-LABEL: infiniteloop3
+; CHECK: ret
+define void @infiniteloop3() {
+entry:
+ br i1 undef, label %loop2a, label %body
+
+body: ; preds = %entry
+ br i1 undef, label %loop2a, label %end
+
+loop1: ; preds = %loop2a, %loop2b
+ %var.phi = phi i32* [ %next.phi, %loop2b ], [ %var, %loop2a ]
+ %next.phi = phi i32* [ %next.load, %loop2b ], [ %next.var, %loop2a ]
+ %0 = icmp eq i32* %var, null
+ %next.load = load i32*, i32** undef
+ br i1 %0, label %loop2a, label %loop2b
+
+loop2a: ; preds = %loop1, %body, %entry
+ %var = phi i32* [ null, %body ], [ null, %entry ], [ %next.phi, %loop1 ]
+ %next.var = phi i32* [ undef, %body ], [ null, %entry ], [ %next.load, %loop1 ]
+ br label %loop1
+
+loop2b: ; preds = %loop1
+ %gep1 = bitcast i32* %var.phi to i32*
+ %next.ptr = bitcast i32* %gep1 to i32**
+ store i32* %next.phi, i32** %next.ptr
+ br label %loop1
+
+end:
+ ret void
+}
+
+; Don't do shrink-wrapping when we need to re-align the stack pointer.
+; See bug 26642.
+; CHECK-LABEL: stack_realign:
+; CHECK-NOT: lsl w[[LSL1:[0-9]+]], w0, w1
+; CHECK-NOT: lsl w[[LSL2:[0-9]+]], w1, w0
+; CHECK: stp x29, x30, [sp, #-16]!
+; CHECK: mov x29, sp
+; CHECK: sub x{{[0-9]+}}, sp, #16
+; CHECK-DAG: lsl w[[LSL1:[0-9]+]], w0, w1
+; CHECK-DAG: lsl w[[LSL2:[0-9]+]], w1, w0
+; CHECK-DAG: str w[[LSL1]],
+; CHECK-DAG: str w[[LSL2]],
+
+define i32 @stack_realign(i32 %a, i32 %b, i32* %ptr1, i32* %ptr2) {
+ %tmp = alloca i32, align 32
+ %shl1 = shl i32 %a, %b
+ %shl2 = shl i32 %b, %a
+ %tmp2 = icmp slt i32 %a, %b
+ br i1 %tmp2, label %true, label %false
+
+true:
+ store i32 %a, i32* %tmp, align 4
+ %tmp4 = load i32, i32* %tmp
+ br label %false
+
+false:
+ %tmp.0 = phi i32 [ %tmp4, %true ], [ %a, %0 ]
+ store i32 %shl1, i32* %ptr1
+ store i32 %shl2, i32* %ptr2
+ ret i32 %tmp.0
+}
+
+; Re-aligned stack pointer with all caller-save regs live. See bug
+; 26642. In this case we currently avoid shrink wrapping because
+; ensuring we have a scratch register to re-align the stack pointer is
+; too complicated. Output should be the same for both enabled and
+; disabled shrink wrapping.
+; CHECK-LABEL: stack_realign2:
+; CHECK: stp {{x[0-9]+}}, {{x[0-9]+}}, [sp, #-{{[0-9]+}}]!
+; CHECK: add x29, sp, #{{[0-9]+}}
+; CHECK: lsl {{w[0-9]+}}, w0, w1
+
+define void @stack_realign2(i32 %a, i32 %b, i32* %ptr1, i32* %ptr2, i32* %ptr3, i32* %ptr4, i32* %ptr5, i32* %ptr6) {
+ %tmp = alloca i32, align 32
+ %tmp1 = shl i32 %a, %b
+ %tmp2 = shl i32 %b, %a
+ %tmp3 = lshr i32 %a, %b
+ %tmp4 = lshr i32 %b, %a
+ %tmp5 = add i32 %b, %a
+ %tmp6 = sub i32 %b, %a
+ %tmp7 = add i32 %tmp1, %tmp2
+ %tmp8 = sub i32 %tmp2, %tmp3
+ %tmp9 = add i32 %tmp3, %tmp4
+ %tmp10 = add i32 %tmp4, %tmp5
+ %cmp = icmp slt i32 %a, %b
+ br i1 %cmp, label %true, label %false
+
+true:
+ store i32 %a, i32* %tmp, align 4
+ call void asm sideeffect "nop", "~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27},~{x28}"() nounwind
+ br label %false
+
+false:
+ store i32 %tmp1, i32* %ptr1, align 4
+ store i32 %tmp2, i32* %ptr2, align 4
+ store i32 %tmp3, i32* %ptr3, align 4
+ store i32 %tmp4, i32* %ptr4, align 4
+ store i32 %tmp5, i32* %ptr5, align 4
+ store i32 %tmp6, i32* %ptr6, align 4
+ %idx1 = getelementptr inbounds i32, i32* %ptr1, i64 1
+ store i32 %a, i32* %idx1, align 4
+ %idx2 = getelementptr inbounds i32, i32* %ptr1, i64 2
+ store i32 %b, i32* %idx2, align 4
+ %idx3 = getelementptr inbounds i32, i32* %ptr1, i64 3
+ store i32 %tmp7, i32* %idx3, align 4
+ %idx4 = getelementptr inbounds i32, i32* %ptr1, i64 4
+ store i32 %tmp8, i32* %idx4, align 4
+ %idx5 = getelementptr inbounds i32, i32* %ptr1, i64 5
+ store i32 %tmp9, i32* %idx5, align 4
+ %idx6 = getelementptr inbounds i32, i32* %ptr1, i64 6
+ store i32 %tmp10, i32* %idx6, align 4
+
+ ret void
+}
projects / oota-llvm.git / blobdiff