161 lines
4.4 KiB
LLVM
161 lines
4.4 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -instcombine -S < %s | FileCheck %s
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; RUN: opt -passes=instcombine -S < %s | FileCheck %s
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declare void @use(i32 %x)
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declare i1 @cond()
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define void @test_01(i32 %x, i32 %y) {
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; CHECK-LABEL: @test_01(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[C2:%.*]] = icmp slt i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: br i1 [[C2]], label [[EXIT:%.*]], label [[UNREACHED:%.*]]
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; CHECK: unreached:
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; CHECK-NEXT: [[C1:%.*]] = icmp ne i32 [[X]], [[Y]]
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; CHECK-NEXT: [[COMPARATOR:%.*]] = zext i1 [[C1]] to i32
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; CHECK-NEXT: call void @use(i32 [[COMPARATOR]])
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; CHECK-NEXT: unreachable
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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%c1 = icmp eq i32 %x, %y
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%c2 = icmp slt i32 %x, %y
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%signed = select i1 %c2, i32 -1, i32 1
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%comparator = select i1 %c1, i32 0, i32 %signed
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br i1 %c2, label %exit, label %unreached
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unreached:
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call void @use(i32 %comparator)
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unreachable
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exit:
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ret void
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}
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define void @test_02(i32 %x, i32 %y) {
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; CHECK-LABEL: @test_02(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[C2:%.*]] = icmp slt i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: br i1 [[C2]], label [[EXIT:%.*]], label [[MEDIUM:%.*]]
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; CHECK: medium:
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; CHECK-NEXT: [[C3:%.*]] = icmp sgt i32 [[X]], [[Y]]
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; CHECK-NEXT: br i1 [[C3]], label [[EXIT]], label [[UNREACHED:%.*]]
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; CHECK: unreached:
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; CHECK-NEXT: [[C1:%.*]] = icmp eq i32 [[X]], [[Y]]
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; CHECK-NEXT: [[SIGNED:%.*]] = select i1 [[C2]], i32 -1, i32 1
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; CHECK-NEXT: [[COMPARATOR:%.*]] = select i1 [[C1]], i32 0, i32 [[SIGNED]]
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; CHECK-NEXT: call void @use(i32 [[COMPARATOR]])
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; CHECK-NEXT: unreachable
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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%c1 = icmp eq i32 %x, %y
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%c2 = icmp slt i32 %x, %y
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%signed = select i1 %c2, i32 -1, i32 1
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%comparator = select i1 %c1, i32 0, i32 %signed
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br i1 %c2, label %exit, label %medium
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medium:
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%c3 = icmp sgt i32 %x, %y
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br i1 %c3, label %exit, label %unreached
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unreached:
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call void @use(i32 %comparator)
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unreachable
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exit:
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ret void
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}
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define i32 @test_03(i32 %x, i32 %y) {
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; CHECK-LABEL: @test_03(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[C2:%.*]] = icmp slt i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: br i1 [[C2]], label [[EXIT:%.*]], label [[MEDIUM:%.*]]
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; CHECK: medium:
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; CHECK-NEXT: [[C3:%.*]] = icmp sgt i32 [[X]], [[Y]]
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; CHECK-NEXT: br i1 [[C3]], label [[EXIT]], label [[UNREACHED:%.*]]
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; CHECK: unreached:
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; CHECK-NEXT: [[C1:%.*]] = icmp eq i32 [[X]], [[Y]]
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; CHECK-NEXT: [[SIGNED:%.*]] = select i1 [[C2]], i32 -1, i32 1
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; CHECK-NEXT: [[COMPARATOR:%.*]] = select i1 [[C1]], i32 0, i32 [[SIGNED]]
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; CHECK-NEXT: ret i32 [[COMPARATOR]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 0
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;
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entry:
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%c1 = icmp eq i32 %x, %y
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%c2 = icmp slt i32 %x, %y
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%signed = select i1 %c2, i32 -1, i32 1
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%comparator = select i1 %c1, i32 0, i32 %signed
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br i1 %c2, label %exit, label %medium
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medium:
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%c3 = icmp sgt i32 %x, %y
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br i1 %c3, label %exit, label %unreached
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unreached:
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ret i32 %comparator
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exit:
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ret i32 0
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}
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define i32 @test_04(i32 %x, i1 %c) {
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; CHECK-LABEL: @test_04(
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; CHECK-NEXT: bb0:
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; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: br label [[BB3]]
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; CHECK: bb3:
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; CHECK-NEXT: [[P:%.*]] = phi i32 [ 0, [[BB1]] ], [ 1, [[BB2]] ]
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; CHECK-NEXT: [[A:%.*]] = add i32 [[X:%.*]], 1
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; CHECK-NEXT: [[R:%.*]] = add i32 [[P]], [[A]]
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; CHECK-NEXT: ret i32 [[R]]
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;
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bb0:
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%a = add i32 %x, 1
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br i1 %c, label %bb1, label %bb2
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bb1:
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br label %bb3
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bb2:
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br label %bb3
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bb3:
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%p = phi i32 [0, %bb1], [1, %bb2]
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%r = add i32 %p, %a
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ret i32 %r
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}
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; Do not sink into a potentially hotter block.
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define i32 @test_05_neg(i32 %x, i1 %cond) {
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; CHECK-LABEL: @test_05_neg(
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; CHECK-NEXT: bb0:
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; CHECK-NEXT: [[A:%.*]] = add i32 [[X:%.*]], 1
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: [[CALL:%.*]] = call i1 @cond()
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; CHECK-NEXT: br i1 [[CALL]], label [[BB2]], label [[BB3]]
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; CHECK: bb3:
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; CHECK-NEXT: [[P:%.*]] = phi i32 [ 0, [[BB1]] ], [ [[A]], [[BB2]] ]
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; CHECK-NEXT: ret i32 [[P]]
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;
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bb0:
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%a = add i32 %x, 1
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br i1 %cond, label %bb1, label %bb2
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bb1:
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br label %bb3
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bb2:
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%call = call i1 @cond()
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br i1 %call, label %bb2, label %bb3
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bb3:
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%p = phi i32 [0, %bb1], [%a, %bb2]
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ret i32 %p
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}
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