13ffde316a
Remove compares after replacing all uses. Cleaning dead compares can enable additional simplifications when adjusting the position of the pass slightly. In particular, it seems like the additional dead instructions may prevent SimplifyCFG performing some folds. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D158760
44 lines
1.7 KiB
LLVM
44 lines
1.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s
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declare void @llvm.assume(i1 noundef) #0
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@arr1 = common global [3 x i16] zeroinitializer, align 2
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define i1 @gep_constexpr_index_lt_upper(i32 noundef %i) {
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; CHECK-LABEL: @gep_constexpr_index_lt_upper(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CMP:%.*]] = icmp ult i32 [[I:%.*]], 3
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; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
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; CHECK-NEXT: [[IDXPROM:%.*]] = zext i32 [[I]] to i64
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; CHECK-NEXT: [[UPPER:%.*]] = getelementptr inbounds i16, ptr @arr1, i64 [[IDXPROM]]
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; CHECK-NEXT: ret i1 true
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;
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entry:
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%cmp = icmp ult i32 %i, 3
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call void @llvm.assume(i1 %cmp)
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%idxprom = zext i32 %i to i64
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%upper = getelementptr inbounds i16, ptr @arr1, i64 %idxprom
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%c.1 = icmp ult ptr %upper, getelementptr inbounds ([3 x i16], ptr @arr1, i64 1, i64 0)
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ret i1 %c.1
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}
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define i1 @gep_constexpr_index_may_be_gt_upper(i32 noundef %i) {
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; CHECK-LABEL: @gep_constexpr_index_may_be_gt_upper(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CMP:%.*]] = icmp ult i32 [[I:%.*]], 3
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; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
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; CHECK-NEXT: [[IDXPROM:%.*]] = zext i32 [[I]] to i64
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; CHECK-NEXT: [[UPPER:%.*]] = getelementptr inbounds i16, ptr @arr1, i64 [[IDXPROM]]
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; CHECK-NEXT: [[C_1:%.*]] = icmp ult ptr [[UPPER]], getelementptr inbounds ([3 x i16], ptr @arr1, i64 0, i64 2)
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; CHECK-NEXT: ret i1 [[C_1]]
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;
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entry:
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%cmp = icmp ult i32 %i, 3
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call void @llvm.assume(i1 %cmp)
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%idxprom = zext i32 %i to i64
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%upper = getelementptr inbounds i16, ptr @arr1, i64 %idxprom
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%c.1 = icmp ult ptr %upper, getelementptr inbounds ([3 x i16], ptr @arr1, i64 0, i64 2)
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ret i1 %c.1
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}
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