forked from OSchip/llvm-project
99 lines
2.7 KiB
LLVM
99 lines
2.7 KiB
LLVM
; RUN: opt -S -loop-unswitch < %s | FileCheck %s
|
|
; RUN: opt -S -loop-unswitch -enable-mssa-loop-dependency=true -verify-memoryssa < %s | FileCheck %s
|
|
|
|
declare void @llvm.experimental.guard(i1, ...)
|
|
|
|
define void @f_0(i32 %n, i32* %ptr, i1 %c) {
|
|
; CHECK-LABEL: @f_0(
|
|
; CHECK: loop.us:
|
|
; CHECK-NOT: guard
|
|
; CHECK: loop:
|
|
; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ]
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ]
|
|
%iv.inc = add i32 %iv, 1
|
|
call void(i1, ...) @llvm.experimental.guard(i1 %c) [ "deopt"() ]
|
|
store volatile i32 0, i32* %ptr
|
|
%becond = icmp ult i32 %iv.inc, %n
|
|
br i1 %becond, label %leave, label %loop
|
|
|
|
leave:
|
|
ret void
|
|
}
|
|
|
|
define void @f_1(i32 %n, i32* %ptr, i1 %c_0, i1 %c_1) {
|
|
; CHECK-LABEL: @f_1(
|
|
; CHECK: loop.us.us:
|
|
; CHECK-NOT: guard
|
|
; CHECK: loop.us:
|
|
; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 2) ]
|
|
; CHECK-NOT: guard
|
|
; CHECK: loop.us1:
|
|
; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 1) ]
|
|
; CHECK-NOT: guard
|
|
; CHECK: loop:
|
|
; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 1) ]
|
|
; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 2) ]
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ]
|
|
%iv.inc = add i32 %iv, 1
|
|
call void(i1, ...) @llvm.experimental.guard(i1 %c_0) [ "deopt"(i32 1) ]
|
|
store volatile i32 0, i32* %ptr
|
|
call void(i1, ...) @llvm.experimental.guard(i1 %c_1) [ "deopt"(i32 2) ]
|
|
%becond = icmp ult i32 %iv.inc, %n
|
|
br i1 %becond, label %leave, label %loop
|
|
|
|
leave:
|
|
ret void
|
|
}
|
|
|
|
; Basic negative test
|
|
|
|
define void @f_3(i32 %n, i32* %ptr, i1* %c_ptr) {
|
|
; CHECK-LABEL: @f_3(
|
|
; CHECK-NOT: loop.us:
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ]
|
|
%iv.inc = add i32 %iv, 1
|
|
%c = load volatile i1, i1* %c_ptr
|
|
call void(i1, ...) @llvm.experimental.guard(i1 %c) [ "deopt"() ]
|
|
store volatile i32 0, i32* %ptr
|
|
%becond = icmp ult i32 %iv.inc, %n
|
|
br i1 %becond, label %leave, label %loop
|
|
|
|
leave:
|
|
ret void
|
|
}
|
|
|
|
define void @f_4(i32 %n, i32* %ptr, i1 %c) {
|
|
; CHECK-LABEL: @f_4(
|
|
;
|
|
; Demonstrate that unswitching on one guard can cause another guard to
|
|
; be erased (this has implications on what guards we can keep raw
|
|
; pointers to).
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ]
|
|
%iv.inc = add i32 %iv, 1
|
|
call void(i1, ...) @llvm.experimental.guard(i1 %c) [ "deopt"(i32 1) ]
|
|
store volatile i32 0, i32* %ptr
|
|
%neg = xor i1 %c, 1
|
|
call void(i1, ...) @llvm.experimental.guard(i1 %neg) [ "deopt"(i32 2) ]
|
|
%becond = icmp ult i32 %iv.inc, %n
|
|
br i1 %becond, label %leave, label %loop
|
|
|
|
leave:
|
|
ret void
|
|
}
|