8691544a27
When all else fails, use range metadata to constrain the result of loads and calls. It should also be possible to use !nonnull, but that would require some general support for inequalities in SCCP first. Differential Revision: https://reviews.llvm.org/D83179
101 lines
2.8 KiB
LLVM
101 lines
2.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -ipsccp -S | FileCheck %s
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declare void @use(i1)
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declare i32 @get_i32()
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define void @load_range(i32* %p) {
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; CHECK-LABEL: @load_range(
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; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[P:%.*]], align 4, !range !0
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; CHECK-NEXT: call void @use(i1 true)
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; CHECK-NEXT: [[C2:%.*]] = icmp ult i32 [[V]], 9
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; CHECK-NEXT: call void @use(i1 [[C2]])
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; CHECK-NEXT: call void @use(i1 false)
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; CHECK-NEXT: [[C4:%.*]] = icmp ugt i32 [[V]], 8
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; CHECK-NEXT: call void @use(i1 [[C4]])
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; CHECK-NEXT: ret void
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;
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%v = load i32, i32* %p, !range !{i32 0, i32 10}
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%c1 = icmp ult i32 %v, 10
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call void @use(i1 %c1)
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%c2 = icmp ult i32 %v, 9
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call void @use(i1 %c2)
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%c3 = icmp ugt i32 %v, 9
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call void @use(i1 %c3)
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%c4 = icmp ugt i32 %v, 8
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call void @use(i1 %c4)
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ret void
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}
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define i32 @load_range_single(i32* %p) {
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; CHECK-LABEL: @load_range_single(
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; CHECK-NEXT: ret i32 0
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;
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%v = load i32, i32* %p, !range !{i32 0, i32 1}
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ret i32 %v
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}
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define i32 @load_range_single_volatile(i32* %p) {
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; CHECK-LABEL: @load_range_single_volatile(
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; CHECK-NEXT: [[V:%.*]] = load volatile i32, i32* [[P:%.*]], align 4, !range !1
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; CHECK-NEXT: ret i32 [[V]]
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;
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%v = load volatile i32, i32* %p, !range !{i32 0, i32 1}
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ret i32 %v
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}
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define void @load_nonnull(i32** %p) {
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; CHECK-LABEL: @load_nonnull(
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; CHECK-NEXT: [[V:%.*]] = load i32*, i32** [[P:%.*]], align 8, !nonnull !2
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; CHECK-NEXT: [[C1:%.*]] = icmp ne i32* [[V]], null
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; CHECK-NEXT: call void @use(i1 [[C1]])
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; CHECK-NEXT: ret void
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;
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%v = load i32*, i32** %p, !nonnull !{}
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%c1 = icmp ne i32* %v, null
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call void @use(i1 %c1)
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ret void
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}
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define void @call_range(i32* %p) {
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; CHECK-LABEL: @call_range(
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; CHECK-NEXT: [[V:%.*]] = call i32 @get_i32(), !range !0
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; CHECK-NEXT: call void @use(i1 true)
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; CHECK-NEXT: [[C2:%.*]] = icmp ult i32 [[V]], 9
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; CHECK-NEXT: call void @use(i1 [[C2]])
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; CHECK-NEXT: call void @use(i1 false)
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; CHECK-NEXT: [[C4:%.*]] = icmp ugt i32 [[V]], 8
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; CHECK-NEXT: call void @use(i1 [[C4]])
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; CHECK-NEXT: ret void
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;
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%v = call i32 @get_i32(), !range !{i32 0, i32 10}
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%c1 = icmp ult i32 %v, 10
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call void @use(i1 %c1)
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%c2 = icmp ult i32 %v, 9
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call void @use(i1 %c2)
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%c3 = icmp ugt i32 %v, 9
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call void @use(i1 %c3)
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%c4 = icmp ugt i32 %v, 8
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call void @use(i1 %c4)
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ret void
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}
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define internal i1 @ip_cmp_range(i32 %v) {
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; CHECK-LABEL: @ip_cmp_range(
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; CHECK-NEXT: ret i1 undef
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;
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%c = icmp ult i32 %v, 10
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ret i1 %c
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}
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define i1 @ip_load_range(i32* %p) {
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; CHECK-LABEL: @ip_load_range(
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; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[P:%.*]], align 4, !range !0
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; CHECK-NEXT: [[C:%.*]] = call i1 @ip_cmp_range(i32 [[V]])
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; CHECK-NEXT: ret i1 true
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;
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%v = load i32, i32* %p, !range !{i32 0, i32 10}
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%c = call i1 @ip_cmp_range(i32 %v)
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ret i1 %c
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}
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