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| ; XFAIL: *
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -mergeicmps -verify-dom-info -mtriple=x86_64-unknown-unknown -S | FileCheck %s
; This is a more involved test: clang generates this weird pattern for
; tuple<uint8_t, uint8_t, uint8_t, uint8_t>. Right now we skip the entry block
; (which defines the base pointer for other blocks) and the last one (which
; does not have the expected structure). Only middle blocks (bytes [1,2]) are
; merged.
%"class.std::tuple" = type { %"struct.std::_Tuple_impl" }
%"struct.std::_Tuple_impl" = type { %"struct.std::_Tuple_impl.0", %"struct.std::_Head_base.6" }
%"struct.std::_Tuple_impl.0" = type { %"struct.std::_Tuple_impl.1", %"struct.std::_Head_base.5" }
%"struct.std::_Tuple_impl.1" = type { %"struct.std::_Tuple_impl.2", %"struct.std::_Head_base.4" }
%"struct.std::_Tuple_impl.2" = type { %"struct.std::_Head_base" }
%"struct.std::_Head_base" = type { i8 }
%"struct.std::_Head_base.4" = type { i8 }
%"struct.std::_Head_base.5" = type { i8 }
%"struct.std::_Head_base.6" = type { i8 }
define zeroext i1 @opeq(
; CHECK-LABEL: @opeq(
;
; These 2 instructions are split. Then we can merge 3 bytes, instead of 2.
; CHECK: br label [[LAND_ELEM0:%.*]]
; CHECK: land.elem1:
; CHECK-NEXT: [[A_ELEM1_ADDR:%.*]] = getelementptr inbounds i8, i8* %a.base, i64 1
; CHECK-NEXT: [[B_ELEM1_ADDR:%.*]] = getelementptr inbounds i8, i8* %b.base, i64 1
; CHECK-NEXT: [[MEMCMP:%.*]] = call i32 @memcmp(i8* [[A_ELEM1_ADDR]], i8* [[B_ELEM1_ADDR]], i64 3)
; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i32 [[MEMCMP]], 0
; CHECK-NEXT: br label [[OPEQ_EXIT:%.*]]
; CHECK: land.elem0:
; CHECK: [[A_BASE:%.*]] = getelementptr inbounds %"class.std::tuple", %"class.std::tuple"* [[A:%.*]], i64 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0
; CHECK: [[B_BASE:%.*]] = getelementptr inbounds %"class.std::tuple", %"class.std::tuple"* [[B:%.*]], i64 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0
; CHECK-NEXT: [[TMP3:%.*]] = load i8, i8* [[A_BASE]], align 1
; CHECK-NEXT: [[TMP4:%.*]] = load i8, i8* [[B_BASE]], align 1
; CHECK-NEXT: [[CMP_ELEM0:%.*]] = icmp eq i8 [[TMP3]], [[TMP4]]
; CHECK-NEXT: br i1 [[CMP_ELEM0]], label [[LAND_ELEM1:%.*]], label [[OPEQ_EXIT]]
; CHECK: opeq.exit:
; CHECK-NEXT: [[TMP5:%.*]] = phi i1 [ [[CMP_ELEM0]], [[LAND_ELEM0]] ], [ [[TMP2]], [[LAND_ELEM1]] ]
; CHECK-NEXT: ret i1 [[TMP5]]
;
%"class.std::tuple"* nocapture readonly dereferenceable(4) %a,
%"class.std::tuple"* nocapture readonly dereferenceable(4) %b) local_unnamed_addr #1 {
entry:
%a.base = getelementptr inbounds %"class.std::tuple", %"class.std::tuple"* %a, i64 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0
%a.elem3.addr = getelementptr inbounds i8, i8* %a.base, i64 3
%0 = load i8, i8* %a.elem3.addr, align 1
%b.base = getelementptr inbounds %"class.std::tuple", %"class.std::tuple"* %b, i64 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0
%b.elem3.addr = getelementptr inbounds i8, i8* %b.base, i64 3
%1 = load i8, i8* %b.elem3.addr, align 1
%cmp.elem3 = icmp eq i8 %0, %1
br i1 %cmp.elem3, label %land.elem2, label %opeq.exit
land.elem2:
%a.elem2.addr = getelementptr inbounds i8, i8* %a.base, i64 2
%2 = load i8, i8* %a.elem2.addr, align 1
%b.elem2.addr = getelementptr inbounds i8, i8* %b.base, i64 2
%3 = load i8, i8* %b.elem2.addr, align 1
%cmp.elem2 = icmp eq i8 %2, %3
br i1 %cmp.elem2, label %land.elem1, label %opeq.exit
land.elem1:
%a.elem1.addr = getelementptr inbounds i8, i8* %a.base, i64 1
%4 = load i8, i8* %a.elem1.addr, align 1
%b.elem1.addr = getelementptr inbounds i8, i8* %b.base, i64 1
%5 = load i8, i8* %b.elem1.addr, align 1
%cmp.elem1 = icmp eq i8 %4, %5
br i1 %cmp.elem1, label %land.elem0, label %opeq.exit
land.elem0:
%6 = load i8, i8* %a.base, align 1
%7 = load i8, i8* %b.base, align 1
%cmp.elem0 = icmp eq i8 %6, %7
br label %opeq.exit
opeq.exit:
%8 = phi i1 [ false, %entry ], [ false, %land.elem2 ], [ false, %land.elem1 ], [ %cmp.elem0, %land.elem0 ]
ret i1 %8
}
|