199 lines
5 KiB
LLVM
199 lines
5 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S < %s | FileCheck %s
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define void @assume_false_to_unreachable1() {
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; CHECK-LABEL: @assume_false_to_unreachable1(
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; CHECK-NEXT: unreachable
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;
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call void @llvm.assume(i1 0)
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ret void
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}
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define void @assume_undef_to_unreachable() {
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; CHECK-LABEL: @assume_undef_to_unreachable(
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; CHECK-NEXT: unreachable
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;
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call void @llvm.assume(i1 undef)
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ret void
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}
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define i32 @speculate_block_with_assume_basic(i1 %c, i32 %x) {
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; CHECK-LABEL: @speculate_block_with_assume_basic(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[C:%.*]], i32 1, i32 0
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; CHECK-NEXT: ret i32 [[SPEC_SELECT]]
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;
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entry:
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br i1 %c, label %if, label %join
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if:
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%cmp = icmp ne i32 %x, 0
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call void @llvm.assume(i1 %cmp)
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br label %join
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join:
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%phi = phi i32 [ 0, %entry ], [ 1, %if ]
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ret i32 %phi
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}
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define i32 @speculate_block_with_assume_extra_instr(i1 %c, i32 %x) {
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; CHECK-LABEL: @speculate_block_with_assume_extra_instr(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ADD:%.*]] = add i32 [[X:%.*]], 1
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; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[C:%.*]], i32 [[ADD]], i32 0
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; CHECK-NEXT: ret i32 [[SPEC_SELECT]]
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;
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entry:
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br i1 %c, label %if, label %join
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if:
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%add = add i32 %x, 1
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%cmp = icmp ne i32 %add, 0
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call void @llvm.assume(i1 %cmp)
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br label %join
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join:
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%phi = phi i32 [ 0, %entry ], [ %add, %if ]
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ret i32 %phi
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}
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; We only allow speculating one instruction. Here %add and %add2 are used by
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; the assume, but not ephemeral, because they are also used by %phi.
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define i32 @speculate_block_with_assume_extra_instrs_too_many(i1 %c, i32 %x) {
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; CHECK-LABEL: @speculate_block_with_assume_extra_instrs_too_many(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[JOIN:%.*]]
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; CHECK: if:
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; CHECK-NEXT: [[ADD:%.*]] = add i32 [[X:%.*]], 1
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; CHECK-NEXT: [[ADD2:%.*]] = add i32 [[ADD]], 1
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; CHECK-NEXT: [[CMP:%.*]] = icmp ne i32 [[ADD2]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
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; CHECK-NEXT: br label [[JOIN]]
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; CHECK: join:
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; CHECK-NEXT: [[PHI:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[ADD2]], [[IF]] ]
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; CHECK-NEXT: ret i32 [[PHI]]
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;
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entry:
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br i1 %c, label %if, label %join
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if:
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%add = add i32 %x, 1
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%add2 = add i32 %add, 1
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%cmp = icmp ne i32 %add2, 0
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call void @llvm.assume(i1 %cmp)
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br label %join
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join:
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%phi = phi i32 [ 0, %entry ], [ %add2, %if ]
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ret i32 %phi
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}
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define i32 @speculate_block_with_assume_extra_instrs_okay(i1 %c, i32 %x) {
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; CHECK-LABEL: @speculate_block_with_assume_extra_instrs_okay(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ADD:%.*]] = add i32 [[X:%.*]], 1
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; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[C:%.*]], i32 [[ADD]], i32 0
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; CHECK-NEXT: ret i32 [[SPEC_SELECT]]
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;
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entry:
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br i1 %c, label %if, label %join
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if:
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%add = add i32 %x, 1
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%add2 = add i32 %add, 1
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%cmp = icmp ne i32 %add2, 0
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call void @llvm.assume(i1 %cmp)
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br label %join
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join:
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%phi = phi i32 [ 0, %entry ], [ %add, %if ]
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ret i32 %phi
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}
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define i32 @speculate_block_with_assume_operand_bundle(i1 %c, ptr %p) {
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; CHECK-LABEL: @speculate_block_with_assume_operand_bundle(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[C:%.*]], i32 1, i32 0
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; CHECK-NEXT: ret i32 [[SPEC_SELECT]]
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;
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entry:
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br i1 %c, label %if, label %join
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if:
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call void @llvm.assume(i1 true) ["nonnull"(ptr %p)]
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br label %join
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join:
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%phi = phi i32 [ 0, %entry ], [ 1, %if ]
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ret i32 %phi
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}
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define void @empty_block_with_assume(i1 %c, i32 %x) {
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; CHECK-LABEL: @empty_block_with_assume(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
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; CHECK: if:
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; CHECK-NEXT: [[CMP:%.*]] = icmp ne i32 [[X:%.*]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
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; CHECK-NEXT: br label [[JOIN:%.*]]
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; CHECK: else:
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; CHECK-NEXT: call void @dummy()
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; CHECK-NEXT: br label [[JOIN]]
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; CHECK: join:
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; CHECK-NEXT: ret void
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;
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entry:
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br i1 %c, label %if, label %else
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if:
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%cmp = icmp ne i32 %x, 0
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call void @llvm.assume(i1 %cmp)
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br label %join
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else:
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call void @dummy()
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br label %join
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join:
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ret void
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}
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define void @not_empty_block_with_assume(i1 %c) {
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; CHECK-LABEL: @not_empty_block_with_assume(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
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; CHECK: if:
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; CHECK-NEXT: [[X:%.*]] = call i32 @may_have_side_effect()
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; CHECK-NEXT: [[CMP:%.*]] = icmp ne i32 [[X]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
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; CHECK-NEXT: br label [[JOIN:%.*]]
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; CHECK: else:
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; CHECK-NEXT: call void @dummy()
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; CHECK-NEXT: br label [[JOIN]]
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; CHECK: join:
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; CHECK-NEXT: ret void
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;
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entry:
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br i1 %c, label %if, label %else
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if:
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%x = call i32 @may_have_side_effect()
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%cmp = icmp ne i32 %x, 0
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call void @llvm.assume(i1 %cmp)
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br label %join
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else:
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call void @dummy()
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br label %join
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join:
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ret void
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}
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declare void @dummy()
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declare i32 @may_have_side_effect()
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declare void @llvm.assume(i1) nounwind
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