forked from OSchip/llvm-project
151 lines
4.3 KiB
LLVM
151 lines
4.3 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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; These should be InstSimplify checks, but most of the code
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; is currently only in InstCombine. TODO: move supporting code
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; Definitely out of range
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define i1 @test_nonzero(i32* nocapture readonly %arg) {
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; CHECK-LABEL:test_nonzero
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; CHECK: ret i1 true
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%val = load i32, i32* %arg, !range !0
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%rval = icmp ne i32 %val, 0
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ret i1 %rval
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}
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define i1 @test_nonzero2(i32* nocapture readonly %arg) {
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; CHECK-LABEL:test_nonzero2
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; CHECK: ret i1 false
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%val = load i32, i32* %arg, !range !0
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%rval = icmp eq i32 %val, 0
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ret i1 %rval
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}
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; Potentially in range
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define i1 @test_nonzero3(i32* nocapture readonly %arg) {
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; CHECK-LABEL: test_nonzero3
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; Check that this does not trigger - it wouldn't be legal
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; CHECK: icmp
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%val = load i32, i32* %arg, !range !1
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%rval = icmp ne i32 %val, 0
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ret i1 %rval
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}
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; Definitely in range
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define i1 @test_nonzero4(i8* nocapture readonly %arg) {
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; CHECK-LABEL: test_nonzero4
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; CHECK: ret i1 false
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%val = load i8, i8* %arg, !range !2
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%rval = icmp ne i8 %val, 0
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ret i1 %rval
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}
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define i1 @test_nonzero5(i8* nocapture readonly %arg) {
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; CHECK-LABEL: test_nonzero5
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; CHECK: ret i1 false
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%val = load i8, i8* %arg, !range !2
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%rval = icmp ugt i8 %val, 0
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ret i1 %rval
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}
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; Cheaper checks (most values in range meet requirements)
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define i1 @test_nonzero6(i8* %argw) {
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; CHECK-LABEL: test_nonzero6
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; CHECK: icmp ne i8 %val, 0
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%val = load i8, i8* %argw, !range !3
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%rval = icmp sgt i8 %val, 0
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ret i1 %rval
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}
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; Constant not in range, should return true.
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define i1 @test_not_in_range(i32* nocapture readonly %arg) {
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; CHECK-LABEL: test_not_in_range
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; CHECK: ret i1 true
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%val = load i32, i32* %arg, !range !0
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%rval = icmp ne i32 %val, 6
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ret i1 %rval
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}
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; Constant in range, can not fold.
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define i1 @test_in_range(i32* nocapture readonly %arg) {
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; CHECK-LABEL: test_in_range
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; CHECK: icmp ne i32 %val, 3
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%val = load i32, i32* %arg, !range !0
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%rval = icmp ne i32 %val, 3
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ret i1 %rval
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}
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; Values in range greater than constant.
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define i1 @test_range_sgt_constant(i32* nocapture readonly %arg) {
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; CHECK-LABEL: test_range_sgt_constant
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; CHECK: ret i1 true
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%val = load i32, i32* %arg, !range !0
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%rval = icmp sgt i32 %val, 0
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ret i1 %rval
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}
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; Values in range less than constant.
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define i1 @test_range_slt_constant(i32* nocapture readonly %arg) {
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; CHECK-LABEL: test_range_slt_constant
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; CHECK: ret i1 false
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%val = load i32, i32* %arg, !range !0
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%rval = icmp sgt i32 %val, 6
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ret i1 %rval
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}
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; Values in union of multiple sub ranges not equal to constant.
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define i1 @test_multi_range1(i32* nocapture readonly %arg) {
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; CHECK-LABEL: test_multi_range1
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; CHECK: ret i1 true
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%val = load i32, i32* %arg, !range !4
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%rval = icmp ne i32 %val, 0
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ret i1 %rval
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}
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; Values in multiple sub ranges not equal to constant, but in
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; union of sub ranges could possibly equal to constant. This
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; in theory could also be folded and might be implemented in
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; the future if shown profitable in practice.
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define i1 @test_multi_range2(i32* nocapture readonly %arg) {
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; CHECK-LABEL: test_multi_range2
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; CHECK: icmp ne i32 %val, 7
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%val = load i32, i32* %arg, !range !4
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%rval = icmp ne i32 %val, 7
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ret i1 %rval
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}
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; Values' ranges overlap each other, so it can not be simplified.
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define i1 @test_two_ranges(i32* nocapture readonly %arg1, i32* nocapture readonly %arg2) {
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; CHECK-LABEL: test_two_ranges
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; CHECK: icmp ult i32 %val2, %val1
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%val1 = load i32, i32* %arg1, !range !5
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%val2 = load i32, i32* %arg2, !range !6
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%rval = icmp ult i32 %val2, %val1
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ret i1 %rval
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}
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; Values' ranges do not overlap each other, so it can simplified to false.
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define i1 @test_two_ranges2(i32* nocapture readonly %arg1, i32* nocapture readonly %arg2) {
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; CHECK-LABEL: test_two_ranges2
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; CHECK: ret i1 false
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%val1 = load i32, i32* %arg1, !range !0
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%val2 = load i32, i32* %arg2, !range !6
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%rval = icmp ult i32 %val2, %val1
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ret i1 %rval
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}
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; Values' ranges do not overlap each other, so it can simplified to true.
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define i1 @test_two_ranges3(i32* nocapture readonly %arg1, i32* nocapture readonly %arg2) {
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; CHECK-LABEL: test_two_ranges3
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; CHECK: ret i1 true
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%val1 = load i32, i32* %arg1, !range !0
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%val2 = load i32, i32* %arg2, !range !6
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%rval = icmp ugt i32 %val2, %val1
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ret i1 %rval
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}
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!0 = !{i32 1, i32 6}
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!1 = !{i32 0, i32 6}
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!2 = !{i8 0, i8 1}
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!3 = !{i8 0, i8 6}
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!4 = !{i32 1, i32 6, i32 8, i32 10}
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!5 = !{i32 5, i32 10}
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!6 = !{i32 8, i32 16}
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