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
38 lines
1.3 KiB
LLVM
38 lines
1.3 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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target datalayout = "p:32:32:32"
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declare void @llvm.assume(i1)
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define i1 @gep_idx_implicit_truncate(ptr %dst, i64 %off) {
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; CHECK-LABEL: @gep_idx_implicit_truncate(
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; CHECK-NEXT: [[POS:%.*]] = icmp sge i64 [[OFF:%.*]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[POS]])
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; CHECK-NEXT: [[GEP_OFF:%.*]] = getelementptr inbounds i8, ptr [[DST:%.*]], i64 [[OFF]]
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; CHECK-NEXT: ret i1 true
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;
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%pos = icmp sge i64 %off, 0
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call void @llvm.assume(i1 %pos)
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%gep.off = getelementptr inbounds i8, ptr %dst, i64 %off
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%cmp = icmp ule ptr %dst, %gep.off
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ret i1 %cmp
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}
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define i1 @gep_idx_explicit_truncate(ptr %dst, i64 %off) {
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; CHECK-LABEL: @gep_idx_explicit_truncate(
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; CHECK-NEXT: [[POS:%.*]] = icmp sge i64 [[OFF:%.*]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[POS]])
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; CHECK-NEXT: [[T:%.*]] = trunc i64 [[OFF]] to i32
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; CHECK-NEXT: [[GEP_OFF:%.*]] = getelementptr inbounds i8, ptr [[DST:%.*]], i32 [[T]]
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; CHECK-NEXT: [[CMP:%.*]] = icmp ule ptr [[DST]], [[GEP_OFF]]
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; CHECK-NEXT: ret i1 [[CMP]]
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;
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%pos = icmp sge i64 %off, 0
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call void @llvm.assume(i1 %pos)
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%t = trunc i64 %off to i32
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%gep.off = getelementptr inbounds i8, ptr %dst, i32 %t
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%cmp = icmp ule ptr %dst, %gep.off
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ret i1 %cmp
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}
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