1; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s 2; The instructions addis,addi, bl are used to calculate the address of TLS 3; thread local variables. These TLS access code sequences are generated 4; repeatedly every time the thread local variable is accessed. By communicating 5; to Machine CSE that X2 is guaranteed to have the same value within the same 6; function call (so called Caller Preserved Physical Register), the redudant 7; TLS access code sequences are cleaned up. 8 9%"struct.CC::TT" = type { i64, i32 } 10%class.CC = type { %struct.SS } 11%struct.SS = type { void ()* } 12 13@_ZN2CC2ccE = external thread_local global %"struct.CC::TT", align 8 14 15define noalias i8* @_ZN2CC3funEv(%class.CC* %this) { 16; CHECK-LABEL: _ZN2CC3funEv: 17; CHECK: mflr 0 18; CHECK-NEXT: std 0, 16(1) 19; CHECK-NEXT: stdu 1, -48(1) 20; CHECK-NEXT: .cfi_def_cfa_offset 48 21; CHECK-NEXT: .cfi_offset lr, 16 22; CHECK-NEXT: .cfi_offset r30, -16 23; CHECK-NEXT: ld 12, 0(3) 24; CHECK-NEXT: std 30, 32(1) 25; CHECK-NEXT: mr 30, 3 26; CHECK-NEXT: std 2, 24(1) 27; CHECK-NEXT: mtctr 12 28; CHECK-NEXT: bctrl 29; CHECK-NEXT: ld 2, 24(1) 30; CHECK-NEXT: addis 3, 2, _ZN2CC2ccE@got@tlsgd@ha 31; CHECK-NEXT: addi 3, 3, _ZN2CC2ccE@got@tlsgd@l 32; CHECK-NEXT: bl __tls_get_addr(_ZN2CC2ccE@tlsgd) 33; CHECK-NEXT: nop 34; CHECK-NEXT: ld 4, 0(3) 35; CHECK-NEXT: cmpldi 4, 0 36; CHECK-NEXT: beq 0, .LBB0_2 37; CHECK: addi 4, 3, 8 38; CHECK-NEXT: mr 3, 30 39; CHECK-NEXT: bl _ZN2CC3barEPi 40; CHECK-NEXT: nop 41; CHECK: ld 30, 32(1) 42; CHECK-NEXT: li 3, 0 43; CHECK-NEXT: addi 1, 1, 48 44; CHECK-NEXT: ld 0, 16(1) 45; CHECK-NEXT: mtlr 0 46; CHECK-NEXT: blr 47entry: 48 %foo = getelementptr inbounds %class.CC, %class.CC* %this, i64 0, i32 0, i32 0 49 %0 = load void ()*, void ()** %foo, align 8 50 tail call void %0() 51 %1 = load i64, i64* getelementptr inbounds (%"struct.CC::TT", %"struct.CC::TT"* @_ZN2CC2ccE, i64 0, i32 0) 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(%class.CC* nonnull %this, i32* getelementptr inbounds (%"struct.CC::TT", %"struct.CC::TT"* @_ZN2CC2ccE, i64 0, i32 1)) 57 br label %if.end 58 59if.end: 60 ret i8* null 61} 62 63declare void @_ZN2CC3barEPi(%class.CC*, i32*) 64