1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2; RUN: llc -relocation-model=pic -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s 3; The instructions addis,addi, bl are used to calculate the address of TLS 4; thread local variables. These TLS access code sequences are generated 5; repeatedly every time the thread local variable is accessed. By communicating 6; to Machine CSE that X2 is guaranteed to have the same value within the same 7; function call (so called Caller Preserved Physical Register), the redudant 8; TLS access code sequences are cleaned up. 9 10%"struct.CC::TT" = type { i64, i32 } 11%class.CC = type { %struct.SS } 12%struct.SS = type { ptr } 13 14@_ZN2CC2ccE = external thread_local global %"struct.CC::TT", align 8 15 16define noalias ptr @_ZN2CC3funEv(ptr %this) nounwind { 17; CHECK-LABEL: _ZN2CC3funEv: 18; CHECK: # %bb.0: # %entry 19; CHECK-NEXT: mflr 0 20; CHECK-NEXT: std 30, -16(1) # 8-byte Folded Spill 21; CHECK-NEXT: stdu 1, -48(1) 22; CHECK-NEXT: std 2, 24(1) 23; CHECK-NEXT: std 0, 64(1) 24; CHECK-NEXT: mr 30, 3 25; CHECK-NEXT: ld 12, 0(3) 26; CHECK-NEXT: mtctr 12 27; CHECK-NEXT: bctrl 28; CHECK-NEXT: ld 2, 24(1) 29; CHECK-NEXT: addis 3, 2, _ZN2CC2ccE@got@tlsgd@ha 30; CHECK-NEXT: addi 3, 3, _ZN2CC2ccE@got@tlsgd@l 31; CHECK-NEXT: bl __tls_get_addr(_ZN2CC2ccE@tlsgd) 32; CHECK-NEXT: nop 33; CHECK-NEXT: ld 4, 0(3) 34; CHECK-NEXT: cmpldi 4, 0 35; CHECK-NEXT: beq 0, .LBB0_2 36; CHECK-NEXT: # %bb.1: # %if.then 37; CHECK-NEXT: addi 4, 3, 8 38; CHECK-NEXT: mr 3, 30 39; CHECK-NEXT: bl _ZN2CC3barEPi 40; CHECK-NEXT: nop 41; CHECK-NEXT: .LBB0_2: # %if.end 42; CHECK-NEXT: li 3, 0 43; CHECK-NEXT: addi 1, 1, 48 44; CHECK-NEXT: ld 0, 16(1) 45; CHECK-NEXT: ld 30, -16(1) # 8-byte Folded Reload 46; CHECK-NEXT: mtlr 0 47; CHECK-NEXT: blr 48entry: 49 %0 = load ptr, ptr %this, align 8 50 tail call void %0() 51 %1 = load i64, ptr @_ZN2CC2ccE 52 %tobool = icmp eq i64 %1, 0 53 br i1 %tobool, label %if.end, label %if.then 54 55if.then: 56 tail call void @_ZN2CC3barEPi(ptr nonnull %this, ptr getelementptr inbounds (%"struct.CC::TT", ptr @_ZN2CC2ccE, i64 0, i32 1)) 57 br label %if.end 58 59if.end: 60 ret ptr null 61} 62 63declare void @_ZN2CC3barEPi(ptr, ptr) 64