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clang-p2996/llvm/test/Transforms/EarlyCSE/guards.ll
Joshua Cao f9599bbc7a [AssumptionCache] caches @llvm.experimental.guard's 
As discussed in https://github.com/llvm/llvm-project/issues/59901

This change is not NFC. There is one SCEV and EarlyCSE test that have an
improved analysis/optimization case. Rest of the tests are not failing.

I've mostly only added cleanup to SCEV since that is where this issue
started. As a follow up, I believe there is more cleanup opportunity in
SCEV and other affected passes.

There could be cases where there are missed registerAssumption of
guards, but this case is not so bad because there will be no
miscompilation. AssumptionCacheTracker should take care of deleted
guards.

Differential Revision: https://reviews.llvm.org/D142330
2023-01-24 20:16:46 -08:00

589 lines
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -passes=early-cse -earlycse-debug-hash < %s | FileCheck %s --check-prefixes=CHECK,NO_ASSUME
; RUN: opt < %s -S -passes='early-cse<memssa>' | FileCheck %s --check-prefixes=CHECK,NO_ASSUME
; RUN: opt < %s -S -passes='early-cse<memssa>' --enable-knowledge-retention | FileCheck %s --check-prefixes=CHECK,USE_ASSUME
declare void @llvm.experimental.guard(i1,...)
declare void @llvm.assume(i1)
define i32 @test0(ptr %ptr, i1 %cond) {
; We can do store to load forwarding over a guard, since it does not
; clobber memory
; NO_ASSUME-LABEL: @test0(
; NO_ASSUME-NEXT: store i32 40, ptr [[PTR:%.*]], align 4
; NO_ASSUME-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[COND:%.*]]) [ "deopt"() ]
; NO_ASSUME-NEXT: ret i32 40
;
; USE_ASSUME-LABEL: @test0(
; USE_ASSUME-NEXT: store i32 40, ptr [[PTR:%.*]], align 4
; USE_ASSUME-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[COND:%.*]]) [ "deopt"() ]
; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[PTR]], i64 4), "nonnull"(ptr [[PTR]]), "align"(ptr [[PTR]], i64 4) ]
; USE_ASSUME-NEXT: ret i32 40
;
store i32 40, ptr %ptr
call void(i1,...) @llvm.experimental.guard(i1 %cond) [ "deopt"() ]
%rval = load i32, ptr %ptr
ret i32 %rval
}
define i32 @test1(ptr %val, i1 %cond) {
; We can CSE loads over a guard, since it does not clobber memory
; NO_ASSUME-LABEL: @test1(
; NO_ASSUME-NEXT: [[VAL0:%.*]] = load i32, ptr [[VAL:%.*]], align 4
; NO_ASSUME-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[COND:%.*]]) [ "deopt"() ]
; NO_ASSUME-NEXT: ret i32 0
;
; USE_ASSUME-LABEL: @test1(
; USE_ASSUME-NEXT: [[VAL0:%.*]] = load i32, ptr [[VAL:%.*]], align 4
; USE_ASSUME-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[COND:%.*]]) [ "deopt"() ]
; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[VAL]], i64 4), "nonnull"(ptr [[VAL]]), "align"(ptr [[VAL]], i64 4) ]
; USE_ASSUME-NEXT: ret i32 0
;
%val0 = load i32, ptr %val
call void(i1,...) @llvm.experimental.guard(i1 %cond) [ "deopt"() ]
%val1 = load i32, ptr %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: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ]
; CHECK-NEXT: ret i32 0
;
%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-NEXT: entry:
; CHECK-NEXT: [[COND0:%.*]] = icmp slt i32 [[VAL:%.*]], 40
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[COND0]]) [ "deopt"() ]
; 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]]) [ "deopt"() ]
; 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-NEXT: entry:
; CHECK-NEXT: [[COND0:%.*]] = icmp slt i32 [[VAL:%.*]], 40
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[COND0]]) [ "deopt"() ]
; 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]]) [ "deopt"() ]
; 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, ptr %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, ptr [[PTR:%.*]], align 4
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[C:%.*]]) [ "deopt"() ]
; CHECK-NEXT: store i32 600, ptr [[PTR]], align 4
; CHECK-NEXT: ret void
;
store i32 500, ptr %ptr
call void(i1,...) @llvm.experimental.guard(i1 %c) [ "deopt"() ]
store i32 600, ptr %ptr
ret void
}
define void @test07(i32 %a, i32 %b) {
; Check that we are able to remove the guards on the same condition even if the
; condition is not being recalculated.
; CHECK-LABEL: @test07(
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[CMP]]) [ "deopt"() ]
; CHECK-NEXT: ret void
;
%cmp = icmp eq i32 %a, %b
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
ret void
}
define void @test08(i32 %a, i32 %b, ptr %ptr) {
; Check that we deal correctly with stores when removing guards in the same
; block in case when the condition is not recalculated.
; NO_ASSUME-LABEL: @test08(
; NO_ASSUME-NEXT: [[CMP:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; NO_ASSUME-NEXT: store i32 100, ptr [[PTR:%.*]], align 4
; NO_ASSUME-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[CMP]]) [ "deopt"() ]
; NO_ASSUME-NEXT: store i32 400, ptr [[PTR]], align 4
; NO_ASSUME-NEXT: ret void
;
; USE_ASSUME-LABEL: @test08(
; USE_ASSUME-NEXT: [[CMP:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; USE_ASSUME-NEXT: store i32 100, ptr [[PTR:%.*]], align 4
; USE_ASSUME-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[CMP]]) [ "deopt"() ]
; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[PTR]], i64 4), "nonnull"(ptr [[PTR]]), "align"(ptr [[PTR]], i64 4) ]
; USE_ASSUME-NEXT: store i32 400, ptr [[PTR]], align 4
; USE_ASSUME-NEXT: ret void
;
%cmp = icmp eq i32 %a, %b
store i32 100, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 200, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 300, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 400, ptr %ptr
ret void
}
define void @test09(i32 %a, i32 %b, i1 %c, ptr %ptr) {
; Similar to test08, but with more control flow.
; TODO: Can we get rid of the store in the end of entry given that it is
; post-dominated by other stores?
; NO_ASSUME-LABEL: @test09(
; NO_ASSUME-NEXT: entry:
; NO_ASSUME-NEXT: [[CMP:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; NO_ASSUME-NEXT: store i32 100, ptr [[PTR:%.*]], align 4
; NO_ASSUME-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[CMP]]) [ "deopt"() ]
; NO_ASSUME-NEXT: store i32 400, ptr [[PTR]], align 4
; NO_ASSUME-NEXT: br i1 [[C:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; NO_ASSUME: if.true:
; NO_ASSUME-NEXT: store i32 500, ptr [[PTR]], align 4
; NO_ASSUME-NEXT: br label [[MERGE:%.*]]
; NO_ASSUME: if.false:
; NO_ASSUME-NEXT: store i32 600, ptr [[PTR]], align 4
; NO_ASSUME-NEXT: br label [[MERGE]]
; NO_ASSUME: merge:
; NO_ASSUME-NEXT: ret void
;
; USE_ASSUME-LABEL: @test09(
; USE_ASSUME-NEXT: entry:
; USE_ASSUME-NEXT: [[CMP:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; USE_ASSUME-NEXT: store i32 100, ptr [[PTR:%.*]], align 4
; USE_ASSUME-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[CMP]]) [ "deopt"() ]
; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[PTR]], i64 4), "nonnull"(ptr [[PTR]]), "align"(ptr [[PTR]], i64 4) ]
; USE_ASSUME-NEXT: store i32 400, ptr [[PTR]], align 4
; USE_ASSUME-NEXT: br i1 [[C:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; USE_ASSUME: if.true:
; USE_ASSUME-NEXT: store i32 500, ptr [[PTR]], align 4
; USE_ASSUME-NEXT: br label [[MERGE:%.*]]
; USE_ASSUME: if.false:
; USE_ASSUME-NEXT: store i32 600, ptr [[PTR]], align 4
; USE_ASSUME-NEXT: br label [[MERGE]]
; USE_ASSUME: merge:
; USE_ASSUME-NEXT: ret void
;
entry:
%cmp = icmp eq i32 %a, %b
store i32 100, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 200, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 300, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 400, ptr %ptr
br i1 %c, label %if.true, label %if.false
if.true:
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 500, ptr %ptr
br label %merge
if.false:
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 600, ptr %ptr
br label %merge
merge:
ret void
}
define void @test10(i32 %a, i32 %b, i1 %c, ptr %ptr) {
; Make sure that non-dominating guards do not cause other guards removal.
; CHECK-LABEL: @test10(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: br i1 [[C:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.true:
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[CMP]]) [ "deopt"() ]
; CHECK-NEXT: store i32 100, ptr [[PTR:%.*]], align 4
; CHECK-NEXT: br label [[MERGE:%.*]]
; CHECK: if.false:
; CHECK-NEXT: store i32 200, ptr [[PTR]], align 4
; CHECK-NEXT: br label [[MERGE]]
; CHECK: merge:
; CHECK-NEXT: store i32 300, ptr [[PTR]], align 4
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[CMP]]) [ "deopt"() ]
; CHECK-NEXT: store i32 400, ptr [[PTR]], align 4
; CHECK-NEXT: ret void
;
entry:
%cmp = icmp eq i32 %a, %b
br i1 %c, label %if.true, label %if.false
if.true:
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 100, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
br label %merge
if.false:
store i32 200, ptr %ptr
br label %merge
merge:
store i32 300, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 400, ptr %ptr
ret void
}
define void @test11(i32 %a, i32 %b, ptr %ptr) {
; Make sure that branching condition is applied to guards.
; CHECK-LABEL: @test11(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: br i1 [[CMP]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.true:
; CHECK-NEXT: br label [[MERGE:%.*]]
; CHECK: if.false:
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ]
; CHECK-NEXT: br label [[MERGE]]
; CHECK: merge:
; CHECK-NEXT: ret void
;
entry:
%cmp = icmp eq i32 %a, %b
br i1 %cmp, label %if.true, label %if.false
if.true:
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
br label %merge
if.false:
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
br label %merge
merge:
ret void
}
define void @test12(i32 %a, i32 %b) {
; Check that the assume marks its condition as being true (and thus allows to
; eliminate the dominated guards).
; CHECK-LABEL: @test12(
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
; CHECK-NEXT: ret void
;
%cmp = icmp eq i32 %a, %b
call void @llvm.assume(i1 %cmp)
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
ret void
}
define void @test13(i32 %a, i32 %b, ptr %ptr) {
; Check that we deal correctly with stores when removing guards due to assume.
; NO_ASSUME-LABEL: @test13(
; NO_ASSUME-NEXT: [[CMP:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; NO_ASSUME-NEXT: call void @llvm.assume(i1 [[CMP]])
; NO_ASSUME-NEXT: store i32 400, ptr [[PTR:%.*]], align 4
; NO_ASSUME-NEXT: ret void
;
; USE_ASSUME-LABEL: @test13(
; USE_ASSUME-NEXT: [[CMP:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; USE_ASSUME-NEXT: call void @llvm.assume(i1 [[CMP]])
; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[PTR:%.*]], i64 4), "nonnull"(ptr [[PTR]]), "align"(ptr [[PTR]], i64 4) ]
; USE_ASSUME-NEXT: store i32 400, ptr [[PTR]], align 4
; USE_ASSUME-NEXT: ret void
;
%cmp = icmp eq i32 %a, %b
call void @llvm.assume(i1 %cmp)
store i32 100, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 200, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 300, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 400, ptr %ptr
ret void
}
define void @test14(i32 %a, i32 %b, i1 %c, ptr %ptr) {
; Similar to test13, but with more control flow.
; TODO: Can we get rid of the store in the end of entry given that it is
; post-dominated by other stores?
; NO_ASSUME-LABEL: @test14(
; NO_ASSUME-NEXT: entry:
; NO_ASSUME-NEXT: [[CMP:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; NO_ASSUME-NEXT: call void @llvm.assume(i1 [[CMP]])
; NO_ASSUME-NEXT: store i32 400, ptr [[PTR:%.*]], align 4
; NO_ASSUME-NEXT: br i1 [[C:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; NO_ASSUME: if.true:
; NO_ASSUME-NEXT: store i32 500, ptr [[PTR]], align 4
; NO_ASSUME-NEXT: br label [[MERGE:%.*]]
; NO_ASSUME: if.false:
; NO_ASSUME-NEXT: store i32 600, ptr [[PTR]], align 4
; NO_ASSUME-NEXT: br label [[MERGE]]
; NO_ASSUME: merge:
; NO_ASSUME-NEXT: ret void
;
; USE_ASSUME-LABEL: @test14(
; USE_ASSUME-NEXT: entry:
; USE_ASSUME-NEXT: [[CMP:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; USE_ASSUME-NEXT: call void @llvm.assume(i1 [[CMP]])
; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[PTR:%.*]], i64 4), "nonnull"(ptr [[PTR]]), "align"(ptr [[PTR]], i64 4) ]
; USE_ASSUME-NEXT: store i32 400, ptr [[PTR]], align 4
; USE_ASSUME-NEXT: br i1 [[C:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; USE_ASSUME: if.true:
; USE_ASSUME-NEXT: store i32 500, ptr [[PTR]], align 4
; USE_ASSUME-NEXT: br label [[MERGE:%.*]]
; USE_ASSUME: if.false:
; USE_ASSUME-NEXT: store i32 600, ptr [[PTR]], align 4
; USE_ASSUME-NEXT: br label [[MERGE]]
; USE_ASSUME: merge:
; USE_ASSUME-NEXT: ret void
;
entry:
%cmp = icmp eq i32 %a, %b
call void @llvm.assume(i1 %cmp)
store i32 100, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 200, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 300, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 400, ptr %ptr
br i1 %c, label %if.true, label %if.false
if.true:
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 500, ptr %ptr
br label %merge
if.false:
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 600, ptr %ptr
br label %merge
merge:
ret void
}
define void @test15(i32 %a, i32 %b, i1 %c, ptr %ptr) {
; Make sure that non-dominating assumes do not cause guards removal.
; CHECK-LABEL: @test15(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: br i1 [[C:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.true:
; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
; CHECK-NEXT: store i32 100, ptr [[PTR:%.*]], align 4
; CHECK-NEXT: br label [[MERGE:%.*]]
; CHECK: if.false:
; CHECK-NEXT: store i32 200, ptr [[PTR]], align 4
; CHECK-NEXT: br label [[MERGE]]
; CHECK: merge:
; CHECK-NEXT: store i32 300, ptr [[PTR]], align 4
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[CMP]]) [ "deopt"() ]
; CHECK-NEXT: store i32 400, ptr [[PTR]], align 4
; CHECK-NEXT: ret void
;
entry:
%cmp = icmp eq i32 %a, %b
br i1 %c, label %if.true, label %if.false
if.true:
call void @llvm.assume(i1 %cmp)
store i32 100, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
br label %merge
if.false:
store i32 200, ptr %ptr
br label %merge
merge:
store i32 300, ptr %ptr
call void (i1, ...) @llvm.experimental.guard(i1 %cmp) [ "deopt"() ]
store i32 400, ptr %ptr
ret void
}
define void @test16(i32 %a, i32 %b) {
; Check that we don't bother to do anything with assumes even if we know the
; condition being true.
; CHECK-LABEL: @test16(
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
; CHECK-NEXT: ret void
;
%cmp = icmp eq i32 %a, %b
call void @llvm.assume(i1 %cmp)
call void @llvm.assume(i1 %cmp)
ret void
}
define void @test17(i32 %a, i32 %b, i1 %c, ptr %ptr) {
; Check that we don't bother to do anything with assumes even if we know the
; condition being true or false (includes come control flow).
; CHECK-LABEL: @test17(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: br i1 [[C:%.*]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.true:
; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
; CHECK-NEXT: br label [[MERGE:%.*]]
; CHECK: if.false:
; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
; CHECK-NEXT: br label [[MERGE]]
; CHECK: merge:
; CHECK-NEXT: ret void
;
entry:
%cmp = icmp eq i32 %a, %b
br i1 %c, label %if.true, label %if.false
if.true:
call void @llvm.assume(i1 %cmp)
br label %merge
if.false:
call void @llvm.assume(i1 %cmp)
br label %merge
merge:
ret void
}
define void @test18(i1 %c) {
; Check that we don't bother to do anything with assumes even if we know the
; condition being true and not being an instruction.
; CHECK-LABEL: @test18(
; CHECK-NEXT: call void @llvm.assume(i1 [[C:%.*]])
; CHECK-NEXT: call void @llvm.assume(i1 [[C]])
; CHECK-NEXT: ret void
;
call void @llvm.assume(i1 %c)
call void @llvm.assume(i1 %c)
ret void
}
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