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clang-p2996/llvm/test/Transforms/InstCombine/array.ll
Nikita Popov 462cb3cd6c [InstCombine] Infer nusw + nneg -> nuw for getelementptr (#111144) 
If the gep is nusw (usually via inbounds) and the offset is
non-negative, we can infer nuw.

Proof: https://alive2.llvm.org/ce/z/ihztLy
2024-12-05 14:36:40 +01:00

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LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
define void @test(ptr %ptr, i32 %a, i32 %b) {
; CHECK-LABEL: define void @test(
; CHECK-SAME: ptr [[PTR:%.*]], i32 [[A:%.*]], i32 [[B:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = sext i32 [[A]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i32, ptr [[PTR]], i64 [[TMP0]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, ptr [[TMP1]], i64 40
; CHECK-NEXT: store i32 [[B]], ptr [[GEP]], align 4
; CHECK-NEXT: ret void
;
entry:
%add = add nsw i32 %a, 10
%idx = sext i32 %add to i64
%gep = getelementptr inbounds i32, ptr %ptr, i64 %idx
store i32 %b, ptr %gep
ret void
}
define i32 @test_add_res_moreoneuse(ptr %ptr, i32 %a, i32 %b) {
; CHECK-LABEL: define i32 @test_add_res_moreoneuse(
; CHECK-SAME: ptr [[PTR:%.*]], i32 [[A:%.*]], i32 [[B:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[A]], 5
; CHECK-NEXT: [[IDX:%.*]] = sext i32 [[ADD]] to i64
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, ptr [[PTR]], i64 [[IDX]]
; CHECK-NEXT: store i32 [[B]], ptr [[GEP]], align 4
; CHECK-NEXT: ret i32 [[ADD]]
;
entry:
%add = add nsw i32 %a, 5
%idx = sext i32 %add to i64
%gep = getelementptr inbounds i32, ptr %ptr, i64 %idx
store i32 %b, ptr %gep
ret i32 %add
}
define void @test_addop_nonsw_flag(ptr %ptr, i32 %a, i32 %b) {
; CHECK-LABEL: define void @test_addop_nonsw_flag(
; CHECK-SAME: ptr [[PTR:%.*]], i32 [[A:%.*]], i32 [[B:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[ADD:%.*]] = add i32 [[A]], 10
; CHECK-NEXT: [[IDX:%.*]] = sext i32 [[ADD]] to i64
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, ptr [[PTR]], i64 [[IDX]]
; CHECK-NEXT: store i32 [[B]], ptr [[GEP]], align 4
; CHECK-NEXT: ret void
;
entry:
%add = add i32 %a, 10
%idx = sext i32 %add to i64
%gep = getelementptr inbounds i32, ptr %ptr, i64 %idx
store i32 %b, ptr %gep
ret void
}
define void @test_add_op2_not_constant(ptr %ptr, i32 %a, i32 %b) {
; CHECK-LABEL: define void @test_add_op2_not_constant(
; CHECK-SAME: ptr [[PTR:%.*]], i32 [[A:%.*]], i32 [[B:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[ADD:%.*]] = add i32 [[A]], [[B]]
; CHECK-NEXT: [[IDX:%.*]] = sext i32 [[ADD]] to i64
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, ptr [[PTR]], i64 [[IDX]]
; CHECK-NEXT: store i32 [[B]], ptr [[GEP]], align 4
; CHECK-NEXT: ret void
;
entry:
%add = add i32 %a, %b
%idx = sext i32 %add to i64
%gep = getelementptr inbounds i32, ptr %ptr, i64 %idx
store i32 %b, ptr %gep
ret void
}
define void @test_zext_nneg(ptr %ptr, i32 %a, i32 %b) {
; CHECK-LABEL: define void @test_zext_nneg(
; CHECK-SAME: ptr [[PTR:%.*]], i32 [[A:%.*]], i32 [[B:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = sext i32 [[A]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i32, ptr [[PTR]], i64 [[TMP0]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, ptr [[TMP1]], i64 40
; CHECK-NEXT: store i32 [[B]], ptr [[GEP]], align 4
; CHECK-NEXT: ret void
;
entry:
%add = add nsw i32 %a, 10
%idx = zext nneg i32 %add to i64
%gep = getelementptr inbounds i32, ptr %ptr, i64 %idx
store i32 %b, ptr %gep
ret void
}
define void @test_zext_missing_nneg(ptr %ptr, i32 %a, i32 %b) {
; CHECK-LABEL: define void @test_zext_missing_nneg(
; CHECK-SAME: ptr [[PTR:%.*]], i32 [[A:%.*]], i32 [[B:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[A]], 10
; CHECK-NEXT: [[IDX:%.*]] = zext i32 [[ADD]] to i64
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds nuw i32, ptr [[PTR]], i64 [[IDX]]
; CHECK-NEXT: store i32 [[B]], ptr [[GEP]], align 4
; CHECK-NEXT: ret void
;
entry:
%add = add nsw i32 %a, 10
%idx = zext i32 %add to i64
%gep = getelementptr inbounds i32, ptr %ptr, i64 %idx
store i32 %b, ptr %gep
ret void
}
define ptr @gep_inbounds_add_nsw_nonneg(ptr %ptr, i64 %a, i64 %b) {
; CHECK-LABEL: define ptr @gep_inbounds_add_nsw_nonneg(
; CHECK-SAME: ptr [[PTR:%.*]], i64 [[A:%.*]], i64 [[B:%.*]]) {
; CHECK-NEXT: [[A_NNEG:%.*]] = icmp sgt i64 [[A]], -1
; CHECK-NEXT: call void @llvm.assume(i1 [[A_NNEG]])
; CHECK-NEXT: [[B_NNEG:%.*]] = icmp sgt i64 [[B]], -1
; CHECK-NEXT: call void @llvm.assume(i1 [[B_NNEG]])
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds nuw i32, ptr [[PTR]], i64 [[A]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds nuw i32, ptr [[TMP1]], i64 [[B]]
; CHECK-NEXT: ret ptr [[GEP]]
;
%a.nneg = icmp sgt i64 %a, -1
call void @llvm.assume(i1 %a.nneg)
%b.nneg = icmp sgt i64 %b, -1
call void @llvm.assume(i1 %b.nneg)
%add = add nsw i64 %a, %b
%gep = getelementptr inbounds i32, ptr %ptr, i64 %add
ret ptr %gep
}
define ptr @gep_inbounds_add_nsw_not_nonneg1(ptr %ptr, i64 %a, i64 %b) {
; CHECK-LABEL: define ptr @gep_inbounds_add_nsw_not_nonneg1(
; CHECK-SAME: ptr [[PTR:%.*]], i64 [[A:%.*]], i64 [[B:%.*]]) {
; CHECK-NEXT: [[A_NNEG:%.*]] = icmp sgt i64 [[A]], -1
; CHECK-NEXT: call void @llvm.assume(i1 [[A_NNEG]])
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i32, ptr [[PTR]], i64 [[A]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i32, ptr [[TMP1]], i64 [[B]]
; CHECK-NEXT: ret ptr [[GEP]]
;
%a.nneg = icmp sgt i64 %a, -1
call void @llvm.assume(i1 %a.nneg)
%add = add nsw i64 %a, %b
%gep = getelementptr inbounds i32, ptr %ptr, i64 %add
ret ptr %gep
}
define ptr @gep_inbounds_add_nsw_not_nonneg2(ptr %ptr, i64 %a, i64 %b) {
; CHECK-LABEL: define ptr @gep_inbounds_add_nsw_not_nonneg2(
; CHECK-SAME: ptr [[PTR:%.*]], i64 [[A:%.*]], i64 [[B:%.*]]) {
; CHECK-NEXT: [[B_NNEG:%.*]] = icmp sgt i64 [[B]], -1
; CHECK-NEXT: call void @llvm.assume(i1 [[B_NNEG]])
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i32, ptr [[PTR]], i64 [[A]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i32, ptr [[TMP1]], i64 [[B]]
; CHECK-NEXT: ret ptr [[GEP]]
;
%b.nneg = icmp sgt i64 %b, -1
call void @llvm.assume(i1 %b.nneg)
%add = add nsw i64 %a, %b
%gep = getelementptr inbounds i32, ptr %ptr, i64 %add
ret ptr %gep
}
define ptr @gep_not_inbounds_add_nsw_nonneg(ptr %ptr, i64 %a, i64 %b) {
; CHECK-LABEL: define ptr @gep_not_inbounds_add_nsw_nonneg(
; CHECK-SAME: ptr [[PTR:%.*]], i64 [[A:%.*]], i64 [[B:%.*]]) {
; CHECK-NEXT: [[A_NNEG:%.*]] = icmp sgt i64 [[A]], -1
; CHECK-NEXT: call void @llvm.assume(i1 [[A_NNEG]])
; CHECK-NEXT: [[B_NNEG:%.*]] = icmp sgt i64 [[B]], -1
; CHECK-NEXT: call void @llvm.assume(i1 [[B_NNEG]])
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i32, ptr [[PTR]], i64 [[A]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i32, ptr [[TMP1]], i64 [[B]]
; CHECK-NEXT: ret ptr [[GEP]]
;
%a.nneg = icmp sgt i64 %a, -1
call void @llvm.assume(i1 %a.nneg)
%b.nneg = icmp sgt i64 %b, -1
call void @llvm.assume(i1 %b.nneg)
%add = add nsw i64 %a, %b
%gep = getelementptr i32, ptr %ptr, i64 %add
ret ptr %gep
}
define ptr @gep_inbounds_add_not_nsw_nonneg(ptr %ptr, i64 %a, i64 %b) {
; CHECK-LABEL: define ptr @gep_inbounds_add_not_nsw_nonneg(
; CHECK-SAME: ptr [[PTR:%.*]], i64 [[A:%.*]], i64 [[B:%.*]]) {
; CHECK-NEXT: [[A_NNEG:%.*]] = icmp sgt i64 [[A]], -1
; CHECK-NEXT: call void @llvm.assume(i1 [[A_NNEG]])
; CHECK-NEXT: [[B_NNEG:%.*]] = icmp sgt i64 [[B]], -1
; CHECK-NEXT: call void @llvm.assume(i1 [[B_NNEG]])
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i32, ptr [[PTR]], i64 [[A]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i32, ptr [[TMP1]], i64 [[B]]
; CHECK-NEXT: ret ptr [[GEP]]
;
%a.nneg = icmp sgt i64 %a, -1
call void @llvm.assume(i1 %a.nneg)
%b.nneg = icmp sgt i64 %b, -1
call void @llvm.assume(i1 %b.nneg)
%add = add i64 %a, %b
%gep = getelementptr inbounds i32, ptr %ptr, i64 %add
ret ptr %gep
}
define ptr @gep_inbounds_sext_add_nonneg(ptr %ptr, i32 %a) {
; CHECK-LABEL: define ptr @gep_inbounds_sext_add_nonneg(
; CHECK-SAME: ptr [[PTR:%.*]], i32 [[A:%.*]]) {
; CHECK-NEXT: [[A_NNEG:%.*]] = icmp sgt i32 [[A]], -1
; CHECK-NEXT: call void @llvm.assume(i1 [[A_NNEG]])
; CHECK-NEXT: [[TMP1:%.*]] = zext nneg i32 [[A]] to i64
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds nuw i32, ptr [[PTR]], i64 [[TMP1]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds nuw i8, ptr [[TMP2]], i64 40
; CHECK-NEXT: ret ptr [[GEP]]
;
%a.nneg = icmp sgt i32 %a, -1
call void @llvm.assume(i1 %a.nneg)
%add = add nsw i32 %a, 10
%idx = sext i32 %add to i64
%gep = getelementptr inbounds i32, ptr %ptr, i64 %idx
ret ptr %gep
}
define ptr @gep_inbounds_sext_add_not_nonneg_1(ptr %ptr, i32 %a) {
; CHECK-LABEL: define ptr @gep_inbounds_sext_add_not_nonneg_1(
; CHECK-SAME: ptr [[PTR:%.*]], i32 [[A:%.*]]) {
; CHECK-NEXT: [[A_NNEG:%.*]] = icmp sgt i32 [[A]], -1
; CHECK-NEXT: call void @llvm.assume(i1 [[A_NNEG]])
; CHECK-NEXT: [[TMP1:%.*]] = zext nneg i32 [[A]] to i64
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr i32, ptr [[PTR]], i64 [[TMP1]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, ptr [[TMP2]], i64 -40
; CHECK-NEXT: ret ptr [[GEP]]
;
%a.nneg = icmp sgt i32 %a, -1
call void @llvm.assume(i1 %a.nneg)
%add = add nsw i32 %a, -10
%idx = sext i32 %add to i64
%gep = getelementptr inbounds i32, ptr %ptr, i64 %idx
ret ptr %gep
}
define ptr @gep_inbounds_sext_add_not_nonneg_2(ptr %ptr, i32 %a) {
; CHECK-LABEL: define ptr @gep_inbounds_sext_add_not_nonneg_2(
; CHECK-SAME: ptr [[PTR:%.*]], i32 [[A:%.*]]) {
; CHECK-NEXT: [[TMP1:%.*]] = sext i32 [[A]] to i64
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr i32, ptr [[PTR]], i64 [[TMP1]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, ptr [[TMP2]], i64 40
; CHECK-NEXT: ret ptr [[GEP]]
;
%add = add nsw i32 %a, 10
%idx = sext i32 %add to i64
%gep = getelementptr inbounds i32, ptr %ptr, i64 %idx
ret ptr %gep
}
define ptr @gep_not_inbounds_sext_add_nonneg(ptr %ptr, i32 %a) {
; CHECK-LABEL: define ptr @gep_not_inbounds_sext_add_nonneg(
; CHECK-SAME: ptr [[PTR:%.*]], i32 [[A:%.*]]) {
; CHECK-NEXT: [[A_NNEG:%.*]] = icmp sgt i32 [[A]], -1
; CHECK-NEXT: call void @llvm.assume(i1 [[A_NNEG]])
; CHECK-NEXT: [[TMP1:%.*]] = zext nneg i32 [[A]] to i64
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr i32, ptr [[PTR]], i64 [[TMP1]]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, ptr [[TMP2]], i64 40
; CHECK-NEXT: ret ptr [[GEP]]
;
%a.nneg = icmp sgt i32 %a, -1
call void @llvm.assume(i1 %a.nneg)
%add = add nsw i32 %a, 10
%idx = sext i32 %add to i64
%gep = getelementptr i32, ptr %ptr, i64 %idx
ret ptr %gep
}
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