forked from OSchip/llvm-project
182 lines
5.1 KiB
LLVM
182 lines
5.1 KiB
LLVM
; RUN: opt -S -early-cse < %s | FileCheck %s
|
|
|
|
declare void @llvm.experimental.guard(i1,...)
|
|
|
|
define i32 @test0(i32* %ptr, i1 %cond) {
|
|
; We can do store to load forwarding over a guard, since it does not
|
|
; clobber memory
|
|
|
|
; CHECK-LABEL: @test0(
|
|
; CHECK-NEXT: store i32 40, i32* %ptr
|
|
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %cond) [ "deopt"() ]
|
|
; CHECK-NEXT: ret i32 40
|
|
|
|
store i32 40, i32* %ptr
|
|
call void(i1,...) @llvm.experimental.guard(i1 %cond) [ "deopt"() ]
|
|
%rval = load i32, i32* %ptr
|
|
ret i32 %rval
|
|
}
|
|
|
|
define i32 @test1(i32* %val, i1 %cond) {
|
|
; We can CSE loads over a guard, since it does not clobber memory
|
|
|
|
; CHECK-LABEL: @test1(
|
|
; CHECK-NEXT: %val0 = load i32, i32* %val
|
|
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %cond) [ "deopt"() ]
|
|
; CHECK-NEXT: ret i32 0
|
|
|
|
%val0 = load i32, i32* %val
|
|
call void(i1,...) @llvm.experimental.guard(i1 %cond) [ "deopt"() ]
|
|
%val1 = load i32, i32* %val
|
|
%rval = sub i32 %val0, %val1
|
|
ret i32 %rval
|
|
}
|
|
|
|
define i32 @test2() {
|
|
; Guards on "true" get removed
|
|
|
|
; CHECK-LABEL: @test2(
|
|
; CHECK-NEXT: ret i32 0
|
|
call void(i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ]
|
|
ret i32 0
|
|
}
|
|
|
|
define i32 @test3(i32 %val) {
|
|
; After a guard has executed the condition it was guarding is known to
|
|
; be true.
|
|
|
|
; CHECK-LABEL: @test3(
|
|
; CHECK-NEXT: %cond0 = icmp slt i32 %val, 40
|
|
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %cond0) [ "deopt"() ]
|
|
; CHECK-NEXT: ret i32 -1
|
|
|
|
%cond0 = icmp slt i32 %val, 40
|
|
call void(i1,...) @llvm.experimental.guard(i1 %cond0) [ "deopt"() ]
|
|
%cond1 = icmp slt i32 %val, 40
|
|
call void(i1,...) @llvm.experimental.guard(i1 %cond1) [ "deopt"() ]
|
|
|
|
%cond2 = icmp slt i32 %val, 40
|
|
%rval = sext i1 %cond2 to i32
|
|
ret i32 %rval
|
|
}
|
|
|
|
define i32 @test3.unhandled(i32 %val) {
|
|
; After a guard has executed the condition it was guarding is known to
|
|
; be true.
|
|
|
|
; CHECK-LABEL: @test3.unhandled(
|
|
; CHECK-NEXT: %cond0 = icmp slt i32 %val, 40
|
|
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %cond0) [ "deopt"() ]
|
|
; CHECK-NEXT: %cond1 = icmp sge i32 %val, 40
|
|
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %cond1) [ "deopt"() ]
|
|
; CHECK-NEXT: ret i32 0
|
|
|
|
; Demonstrates a case we do not yet handle (it is legal to fold %cond2
|
|
; to false)
|
|
%cond0 = icmp slt i32 %val, 40
|
|
call void(i1,...) @llvm.experimental.guard(i1 %cond0) [ "deopt"() ]
|
|
%cond1 = icmp sge i32 %val, 40
|
|
call void(i1,...) @llvm.experimental.guard(i1 %cond1) [ "deopt"() ]
|
|
ret i32 0
|
|
}
|
|
|
|
define i32 @test4(i32 %val, i1 %c) {
|
|
; Same as test3, but with some control flow involved.
|
|
|
|
; CHECK-LABEL: @test4(
|
|
; CHECK: entry:
|
|
; CHECK-NEXT: %cond0 = icmp slt i32 %val, 40
|
|
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %cond0
|
|
; CHECK-NEXT: br label %bb0
|
|
|
|
; CHECK: bb0:
|
|
; CHECK-NEXT: %cond2 = icmp ult i32 %val, 200
|
|
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %cond2
|
|
; CHECK-NEXT: br i1 %c, label %left, label %right
|
|
|
|
; CHECK: left:
|
|
; CHECK-NEXT: ret i32 0
|
|
|
|
; CHECK: right:
|
|
; CHECK-NEXT: ret i32 20
|
|
|
|
entry:
|
|
%cond0 = icmp slt i32 %val, 40
|
|
call void(i1,...) @llvm.experimental.guard(i1 %cond0) [ "deopt"() ]
|
|
%cond1 = icmp slt i32 %val, 40
|
|
call void(i1,...) @llvm.experimental.guard(i1 %cond1) [ "deopt"() ]
|
|
br label %bb0
|
|
|
|
bb0:
|
|
%cond2 = icmp ult i32 %val, 200
|
|
call void(i1,...) @llvm.experimental.guard(i1 %cond2) [ "deopt"() ]
|
|
br i1 %c, label %left, label %right
|
|
|
|
left:
|
|
%cond3 = icmp ult i32 %val, 200
|
|
call void(i1,...) @llvm.experimental.guard(i1 %cond3) [ "deopt"() ]
|
|
ret i32 0
|
|
|
|
right:
|
|
ret i32 20
|
|
}
|
|
|
|
define i32 @test5(i32 %val, i1 %c) {
|
|
; Same as test4, but the %left block has mutliple predecessors.
|
|
|
|
; CHECK-LABEL: @test5(
|
|
|
|
; CHECK: entry:
|
|
; CHECK-NEXT: %cond0 = icmp slt i32 %val, 40
|
|
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %cond0
|
|
; CHECK-NEXT: br label %bb0
|
|
|
|
; CHECK: bb0:
|
|
; CHECK-NEXT: %cond2 = icmp ult i32 %val, 200
|
|
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %cond2
|
|
; CHECK-NEXT: br i1 %c, label %left, label %right
|
|
|
|
; CHECK: left:
|
|
; CHECK-NEXT: br label %right
|
|
|
|
; CHECK: right:
|
|
; CHECK-NEXT: br label %left
|
|
|
|
entry:
|
|
%cond0 = icmp slt i32 %val, 40
|
|
call void(i1,...) @llvm.experimental.guard(i1 %cond0) [ "deopt"() ]
|
|
%cond1 = icmp slt i32 %val, 40
|
|
call void(i1,...) @llvm.experimental.guard(i1 %cond1) [ "deopt"() ]
|
|
br label %bb0
|
|
|
|
bb0:
|
|
%cond2 = icmp ult i32 %val, 200
|
|
call void(i1,...) @llvm.experimental.guard(i1 %cond2) [ "deopt"() ]
|
|
br i1 %c, label %left, label %right
|
|
|
|
left:
|
|
%cond3 = icmp ult i32 %val, 200
|
|
call void(i1,...) @llvm.experimental.guard(i1 %cond3) [ "deopt"() ]
|
|
br label %right
|
|
|
|
right:
|
|
br label %left
|
|
}
|
|
|
|
define void @test6(i1 %c, i32* %ptr) {
|
|
; Check that we do not DSE over calls to @llvm.experimental.guard.
|
|
; Guard intrinsics do _read_ memory, so th call to guard below needs
|
|
; to see the store of 500 to %ptr
|
|
|
|
; CHECK-LABEL: @test6(
|
|
; CHECK-NEXT: store i32 500, i32* %ptr
|
|
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %c) [ "deopt"() ]
|
|
; CHECK-NEXT: store i32 600, i32* %ptr
|
|
|
|
|
|
store i32 500, i32* %ptr
|
|
call void(i1,...) @llvm.experimental.guard(i1 %c) [ "deopt"() ]
|
|
store i32 600, i32* %ptr
|
|
ret void
|
|
}
|