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Differential D125069

[InstCombine] Baseline tests for InstCombine optimization to merge GEP instructions with constant indices
AbandonedPublic

Authored by huangjd on May 5 2022, 8:12 PM.

Details

Reviewers
davidxl
Carrot
nikic
spatel
reames
Summary

Baseline tests for InstCombine optimization to merge GEP instructions with constant indices

Diff Detail

Unit TestsFailed

TimeTest
60,040 msx64 debian > ThreadSanitizer-x86_64.ThreadSanitizer-x86_64::restore_stack.cpp
60,030 msx64 debian > libFuzzer.libFuzzer::fuzzer-leak.test
60,060 msx64 debian > libFuzzer.libFuzzer::large.test

Event Timeline

huangjd created this revision.May 5 2022, 8:12 PM
Herald added a project: Restricted Project. · View Herald TranscriptMay 5 2022, 8:12 PM
huangjd requested review of this revision.May 5 2022, 8:12 PM
Herald added a project: Restricted Project. · View Herald TranscriptMay 5 2022, 8:12 PM
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huangjd added a child revision: D125070: [InstCombine] Simplify chain of GEP with constant indices.May 5 2022, 8:15 PM
huangjd abandoned this revision.May 5 2022, 8:20 PM
huangjd removed a child revision: D125070: [InstCombine] Simplify chain of GEP with constant indices.
Harbormaster completed remote builds in B163061: Diff 427520.May 5 2022, 8:59 PM

Revision Contents

PathSize
llvm/
test/
Transforms/
InstCombine/
380 lines

Diff 427520

llvm/test/Transforms/InstCombine/gep-merge-constant-indices.ll

  • This file was added.
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=instcombine -opaque-pointers -S | FileCheck %s
; Test simplifying nested GEP instructions containing constant indices at the
; first and last GEP.
%struct.A = type { [123 x i8], i32 }
%struct.B = type { i8, [3 x i16], %struct.A, float }
%struct.C = type { i8, i32, i32 }
; result = (p + 3) + a
define i32* @basic(i32* %p, i64 %a) {
; CHECK-LABEL: @basic(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[P:%.*]], i64 1
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i32, ptr [[TMP2]], i64 2
; CHECK-NEXT: ret ptr [[TMP3]]
;
%1 = getelementptr inbounds i32, i32* %p, i64 1
%2 = getelementptr inbounds i32, i32* %1, i64 %a
%3 = getelementptr inbounds i32, i32* %2, i64 2
ret i32* %3
}
; result = (struct.C*) p + 3
define %struct.C* @offsetDivisible(i64* %p) {
; CHECK-LABEL: @offsetDivisible(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i64, ptr [[P:%.*]], i64 3
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds [[STRUCT_C:%.*]], ptr [[TMP1]], i64 1
; CHECK-NEXT: ret ptr [[TMP2]]
;
%1 = getelementptr inbounds i64, i64* %p, i64 3
%2 = getelementptr inbounds %struct.C, %struct.C* %1, i64 1
ret %struct.C* %2
}
; result = (i8*) ((i16*) p + 7) + a
define ptr @opaque(ptr %p, i64 %a) {
; CHECK-LABEL: @opaque(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i16, ptr [[P:%.*]], i64 -1
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i64, ptr [[TMP2]], i64 2
; CHECK-NEXT: ret ptr [[TMP3]]
;
%1 = getelementptr inbounds i16, ptr %p, i64 -1
%2 = getelementptr inbounds i8, ptr %1, i64 %a
%3 = getelementptr inbounds i64, ptr %2, i64 2
ret ptr %3
}
; result = (i32*) (p - 9) + a
define i32* @bitcast(i8* %p, i64 %a) {
; CHECK-LABEL: @bitcast(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[P:%.*]], i64 -1
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i32, ptr [[TMP2]], i64 -2
; CHECK-NEXT: ret ptr [[TMP3]]
;
%1 = getelementptr inbounds i8, i8* %p, i64 -1
%2 = bitcast i8* %1 to i32*
%3 = getelementptr inbounds i32, i32* %2, i64 %a
%4 = getelementptr inbounds i32, i32* %3, i64 -2
ret i32* %4
}
; Last GEP offset is not divisble by first GEP element size.
; result = (i8*) p + 10
define i8* @bitcastReverse(i64* %p, i64 %a) {
; CHECK-LABEL: @bitcastReverse(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i64, ptr [[P:%.*]], i64 1
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 2
; CHECK-NEXT: ret ptr [[TMP2]]
;
%1 = getelementptr inbounds i64, i64* %p, i64 1
%2 = bitcast i64* %1 to i8*
%3 = getelementptr inbounds i8, i8* %2, i64 2
ret i8* %3
}
; result = (i16*) ((i64*) ((i8*) p + a) + (a * b)) + 29
define i16* @nested(i32* %p, i64 %a, i64 %b) {
; CHECK-LABEL: @nested(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[P:%.*]], i64 3
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = mul i64 [[A]], [[B:%.*]]
; CHECK-NEXT: [[TMP4:%.*]] = getelementptr inbounds i64, ptr [[TMP2]], i64 [[TMP3]]
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds i64, ptr [[TMP4]], i64 4
; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i16, ptr [[TMP5]], i64 7
; CHECK-NEXT: ret ptr [[TMP6]]
;
%1 = getelementptr inbounds i32, i32* %p, i64 3
%2 = getelementptr inbounds i8, i8* %1, i64 %a
%3 = mul i64 %a, %b
%4 = bitcast i8* %2 to i64*
%5 = getelementptr inbounds i64, i64* %4, i64 %3
%6 = getelementptr inbounds i64, i64* %5, i64 4
%7 = bitcast i64* %6 to i16*
%8 = getelementptr inbounds i16, i16* %7, i64 7
ret i16* %8
}
; Offsets of first and last GEP cancel out.
; result = (i8*) p + a
define i8* @zeroSum(i32 *%p, i64 %a) {
; CHECK-LABEL: @zeroSum(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[P:%.*]], i64 1
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i8, ptr [[TMP2]], i64 -4
; CHECK-NEXT: ret ptr [[TMP3]]
;
%1 = getelementptr inbounds i32, i32* %p, i64 1
%2 = bitcast i32* %1 to i8*
%3 = getelementptr inbounds i8, i8* %2, i64 %a
%4 = getelementptr inbounds i8, i8* %3, i64 -4
ret i8* %4
}
; Merged index will overflow in the original integer size.
; result = (p + 254) + a
define i32* @indexOverflow(i32* %p, i64 %a) {
; CHECK-LABEL: @indexOverflow(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[P:%.*]], i64 127
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i32, ptr [[TMP2]], i64 127
; CHECK-NEXT: ret ptr [[TMP3]]
;
%1 = getelementptr inbounds i32, i32* %p, i8 127
%2 = getelementptr inbounds i32, i32* %1, i64 %a
%3 = getelementptr inbounds i32, i32* %2, i8 127
ret i32* %3
}
; The optimization still applies if const-indexed GEP have multiple uses, as
; only intermediate GEP are rewritten.
; %4 = (p + 3) + (i32) (p + 1)
; result = %4 + *%4
define i32* @constIndexGEPMultipleUses(i32* %p, i64 %a) {
; CHECK-LABEL: @constIndexGEPMultipleUses(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[P:%.*]], i64 1
; CHECK-NEXT: [[TMP2:%.*]] = ptrtoint ptr [[TMP1]] to i64
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i64 [[TMP2]]
; CHECK-NEXT: [[TMP4:%.*]] = getelementptr inbounds i32, ptr [[TMP3]], i64 2
; CHECK-NEXT: [[TMP5:%.*]] = load i32, ptr [[TMP4]], align 4
; CHECK-NEXT: [[TMP6:%.*]] = sext i32 [[TMP5]] to i64
; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds i32, ptr [[TMP4]], i64 [[TMP6]]
; CHECK-NEXT: ret ptr [[TMP7]]
;
%1 = getelementptr inbounds i32, i32* %p, i64 1
%2 = ptrtoint i32* %1 to i64
%3 = getelementptr inbounds i32, i32* %1, i64 %2
%4 = getelementptr inbounds i32, i32* %3, i64 2
%5 = load i32, i32* %4
%6 = getelementptr inbounds i32, i32* %4, i32 %5
ret i32* %6
}
; result = (i32*) ((p[1] + 17) + a)
define i32* @array1([20 x i8]* %p, i64 %a) {
; CHECK-LABEL: @array1(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds [20 x i8], ptr [[P:%.*]], i64 1, i64 1
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i64, ptr [[TMP2]], i64 2
; CHECK-NEXT: ret ptr [[TMP3]]
;
%1 = getelementptr inbounds [20 x i8], [20 x i8]* %p, i64 1, i64 1
%2 = getelementptr inbounds i8, i8* %1, i64 %a
%3 = getelementptr inbounds i64, i64* %2, i64 2
ret i32* %3
}
; result = (i8*) ((i32*) p + a) + 14
define i8* @array2([7 x i32]* %p, i64 %a) {
; CHECK-LABEL: @array2(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds [7 x i32], ptr [[P:%.*]], i64 0, i64 3
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i8, ptr [[TMP2]], i64 2
; CHECK-NEXT: ret ptr [[TMP3]]
;
%1 = getelementptr inbounds [7 x i32], [7 x i32]* %p, i64 0, i64 3
%2 = getelementptr inbounds i32, i32* %1, i64 %a
%3 = getelementptr inbounds i8, i8* %2, i64 2
ret i8* %3
}
; result = (([3 x i8]*) (p + a))[1] + 17
define i8* @array3(i64* %p, i64 %a) {
; CHECK-LABEL: @array3(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i64, ptr [[P:%.*]], i64 2
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i64, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds [3 x i8], ptr [[TMP2]], i64 1, i64 1
; CHECK-NEXT: ret ptr [[TMP3]]
;
%1 = getelementptr inbounds i64, i64* %p, i64 2
%2 = getelementptr inbounds i64, i64* %1, i64 %a
%3 = getelementptr inbounds [3 x i8], [3 x i8]* %2, i64 1, i64 1
ret i8* %3
}
; result = ((i8*) p + a) - 4
define i8* @struct(%struct.A* %p, i64 %a) {
; CHECK-LABEL: @struct(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds [[STRUCT_A:%.*]], ptr [[P:%.*]], i64 0, i32 1
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i8, ptr [[TMP2]], i64 -128
; CHECK-NEXT: ret ptr [[TMP3]]
;
%1 = getelementptr inbounds %struct.A, %struct.A* %p, i64 0, i32 1
%2 = getelementptr inbounds i8, i8* %1, i64 %a
%3 = getelementptr inbounds i8, i8* %2, i64 -128
ret i8* %3
}
; result = (i32*) ((p - 4) + a)
define i32* @structReverse(i8* %p, i64 %a) {
; CHECK-LABEL: @structReverse(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[P:%.*]], i64 -128
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds [[STRUCT_A:%.*]], ptr [[TMP2]], i64 0, i32 1
; CHECK-NEXT: ret ptr [[TMP3]]
;
%1 = getelementptr inbounds i8, i8* %p, i64 -128
%2 = getelementptr inbounds i8, i8* %1, i64 %a
%3 = getelementptr inbounds %struct.A, %struct.A* %2, i64 0, i32 1
ret i32* %3
}
; result = ((i8*) &p[0].member2.member0 + 7) + a
define i8* @structStruct(%struct.B* %p, i64 %a) {
; CHECK-LABEL: @structStruct(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds [[STRUCT_B:%.*]], ptr [[P:%.*]], i64 0, i32 2, i32 0, i64 3
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds [[STRUCT_A:%.*]], ptr [[TMP2]], i64 0, i32 0, i64 4
; CHECK-NEXT: ret ptr [[TMP3]]
;
%1 = getelementptr inbounds %struct.B, %struct.B* %p, i64 0, i32 2, i32 0, i64 3
%2 = getelementptr inbounds i8, i8* %1, i64 %a
%3 = getelementptr inbounds %struct.A, %struct.A* %2, i64 0, i32 0, i64 4
ret i8* %3
}
; First GEP offset is not divisible by last GEP's source element size, but first
; GEP points to an array such that the last GEP offset is divisible by the
; array's element size, so the first GEP can be rewritten with an extra index.
; result = (i8*) ((i16*) &p[0].member1 + 4) + a
define i64* @appendIndex(%struct.B* %p, i64 %a) {
; CHECK-LABEL: @appendIndex(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds [[STRUCT_B:%.*]], ptr [[P:%.*]], i64 0, i32 1
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i64, ptr [[TMP2]], i64 1
; CHECK-NEXT: ret ptr [[TMP3]]
;
%1 = getelementptr inbounds %struct.B, %struct.B* %p, i64 0, i32 1
%2 = getelementptr inbounds i8, i8* %1, i64 %a
%3 = getelementptr inbounds i64, i64* %2, i64 1
ret i64* %3
}
; result = (i16*) &((struct.B*) (p + a))[0].member1 + 4
define ptr @appendIndexReverse(i64* %p, i64 %a) {
; CHECK-LABEL: @appendIndexReverse(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i64, ptr [[P:%.*]], i64 1
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i64, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds [[STRUCT_B:%.*]], ptr [[TMP2]], i64 0, i32 1
; CHECK-NEXT: ret ptr [[TMP3]]
;
%1 = getelementptr inbounds i64, i64* %p, i64 1
%2 = getelementptr inbounds i64, i64* %1, i64 %a
%3 = getelementptr inbounds %struct.B, %struct.B* %2, i64 0, i32 1
ret ptr %3
}
; Middle const-indexed GEP can't be merged to either first or last GEP, so it
; is being skipped.
; result = (struct.C*) (([5 x i64]*) ((p + 4) + a) + 1) + b
define ptr @skipMiddleGEP(%struct.C* %p, i64 %a, i64 %b) {
; CHECK-LABEL: @skipMiddleGEP(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds [[STRUCT_C:%.*]], ptr [[P:%.*]], i64 1
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds [[STRUCT_C]], ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds [5 x i64], ptr [[TMP2]], i64 1
; CHECK-NEXT: [[TMP4:%.*]] = getelementptr inbounds [[STRUCT_C]], ptr [[TMP3]], i64 [[B:%.*]]
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds [[STRUCT_C]], ptr [[TMP4]], i64 3
; CHECK-NEXT: ret ptr [[TMP5]]
;
%1 = getelementptr inbounds %struct.C, %struct.C* %p, i64 1
%2 = getelementptr inbounds %struct.C, %struct.C* %1, i64 %a
%3 = getelementptr inbounds [5 x i64], [5 x i64]* %2, i64 1
%4 = getelementptr inbounds %struct.C, %struct.C* %3, i64 %b
%5 = getelementptr inbounds %struct.C, %struct.C* %4, i64 3
ret ptr %5
}
; Negative test, can't find a pair of const-indexed GEP.
define i32* @nonConst1(i32* %p, i64 %a) {
; CHECK-LABEL: @nonConst1(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[P:%.*]], i64 1
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: ret ptr [[TMP2]]
;
%1 = getelementptr inbounds i32, i32* %p, i64 1
%2 = getelementptr inbounds i32, i32* %1, i64 %a
ret i32* %2
}
; Negative test, other arithmetic operations are involved in the GEP chain
define i32* @nonConst2(i32* %p, i64 %a) {
; CHECK-LABEL: @nonConst2(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[P:%.*]], i64 1
; CHECK-NEXT: [[TMP2:%.*]] = ptrtoint ptr [[TMP1]] to i64
; CHECK-NEXT: [[TMP3:%.*]] = mul nsw i64 [[TMP2]], [[A:%.*]]
; CHECK-NEXT: [[TMP4:%.*]] = inttoptr i64 [[TMP3]] to ptr
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds i32, ptr [[TMP4]], i64 2
; CHECK-NEXT: ret ptr [[TMP5]]
;
%1 = getelementptr inbounds i32, i32* %p, i64 1
%2 = ptrtoint i32* %1 to i64
%3 = mul nsw i64 %2, %a
%4 = inttoptr i64 %3 to i32*
%5 = getelementptr inbounds i32, i32* %4, i64 2
ret i32* %5
}
; Negative test, intermediate GEP has more than 1 use.
define i32* @intermediateMoreThanOneUse(i32* %p, i64 %a) {
; CHECK-LABEL: @intermediateMoreThanOneUse(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[P:%.*]], i64 1
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = ptrtoint ptr [[TMP2]] to i64
; CHECK-NEXT: [[TMP4:%.*]] = getelementptr inbounds i32, ptr [[TMP2]], i64 [[TMP3]]
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds i32, ptr [[TMP4]], i64 2
; CHECK-NEXT: ret ptr [[TMP5]]
;
%1 = getelementptr inbounds i32, i32* %p, i64 1
%2 = getelementptr inbounds i32, i32* %1, i64 %a
%3 = ptrtoint i32* %2 to i64
%4 = getelementptr inbounds i32, i32* %2, i64 %3
%5 = getelementptr inbounds i32, i32* %4, i64 2
ret i32* %5
}
; Negative test, cannot guarantee arithmetic validity if GEP is not in bounds.
define i32* @notInBounds(i32* %p, i64 %a) {
; CHECK-LABEL: @notInBounds(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i32, ptr [[P:%.*]], i64 1
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr i32, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i32, ptr [[TMP2]], i64 2
; CHECK-NEXT: ret ptr [[TMP3]]
;
%1 = getelementptr i32, i32* %p, i64 1
%2 = getelementptr i32, i32* %1, i64 %a
%3 = getelementptr inbounds i32, i32* %2, i64 2
ret i32* %3
}
; Negative test, neither the last GEP offset is divisble by first GEP size, nor
; the other way around.
define %struct.C* @offsetNotDivisible(i64* %p, i64 %a) {
; CHECK-LABEL: @offsetNotDivisible(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i64, ptr [[P:%.*]], i64 1
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds [[STRUCT_C:%.*]], ptr [[TMP1]], i64 1
; CHECK-NEXT: ret ptr [[TMP2]]
;
%1 = getelementptr inbounds i64, i64* %p, i64 1
%2 = getelementptr inbounds %struct.C, %struct.C* %1, i64 1
ret %struct.C* %2
}
; Negative test, first GEP offset is not divisible by last GEP size, and first
; GEP is a pointer to struct member.
define i64* @structNotDivisible(%struct.C* %p, i64 %a) {
; CHECK-LABEL: @structNotDivisible(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds [[STRUCT_C:%.*]], ptr [[P:%.*]], i64 0, i32 1
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i16, ptr [[TMP1]], i64 [[A:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i64, ptr [[TMP2]], i64 1
; CHECK-NEXT: ret ptr [[TMP3]]
;
%1 = getelementptr inbounds %struct.C, %struct.C* %p, i64 0, i32 1
%2 = getelementptr inbounds i16, i16* %1, i64 %a
%3 = getelementptr inbounds i64, i64* %2, i64 1
ret i64* %3
}