Attachment #888824 for bug #927978

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Lines 1285-1290 void PEI::insertZeroCallUsedRegs(MachineFunction &MF) { Link Here

(-)a/llvm/lib/CodeGen/PrologEpilogInserter.cpp (-2 / +7 lines)
1285	continue;	1285	continue;
1286		1286
1287	MCRegister Reg = MO.getReg();	1287	MCRegister Reg = MO.getReg();
		1288	if (!Reg)
		1289	continue;
1288		1290
1289	// This picks up sibling registers (e.q. %al -> %ah).	1291	// This picks up sibling registers (e.q. %al -> %ah).
1290	for (MCRegUnit Unit : TRI.regunits(Reg))	1292	for (MCRegUnit Unit : TRI.regunits(Reg))
Lines 1308-1315 void PEI::insertZeroCallUsedRegs(MachineFunction &MF) { Link Here
1308	if (!MO.isReg())	1310	if (!MO.isReg())
1309	continue;	1311	continue;
1310		1312
1311	for (const MCPhysReg &Reg :	1313	MCRegister Reg = MO.getReg();
1312	TRI.sub_and_superregs_inclusive(MO.getReg()))	1314	if (!Reg)
		1315	continue;
		1316
		1317	for (const MCPhysReg Reg : TRI.sub_and_superregs_inclusive(Reg))
1313	RegsToZero.reset(Reg);	1318	RegsToZero.reset(Reg);
1314	}	1319	}
1315	}	1320	}




  ret i32 %x
}

define dso_local void @tailcall(ptr %p) local_unnamed_addr #0 "zero-call-used-regs"="used-gpr" {
; I386-LABEL: tailcall:
; I386:       # %bb.0:
; I386-NEXT:    movl {{[0-9]+}}(%esp), %eax
; I386-NEXT:    jmpl *(%eax) # TAILCALL
;
; X86-64-LABEL: tailcall:
; X86-64:       # %bb.0:
; X86-64-NEXT:    jmpq *(%rdi) # TAILCALL
  %c = load ptr, ptr %p
  tail call void %c()
  ret void
}

; Don't emit zeroing registers in "main" function.
define dso_local i32 @main() local_unnamed_addr #1 {
; I386-LABEL: main:

Return to bug 927978

Lines 241-246 entry: Link Here

(-)a/llvm/test/CodeGen/X86/zero-call-used-regs.ll (+14 lines)
241	ret i32 %x	241	ret i32 %x
242	}	242	}
243		243
		244	define dso_local void @tailcall(ptr %p) local_unnamed_addr #0 "zero-call-used-regs"="used-gpr" {
		245	; I386-LABEL: tailcall:
		246	; I386: # %bb.0:
		247	; I386-NEXT: movl {{[0-9]+}}(%esp), %eax
		248	; I386-NEXT: jmpl *(%eax) # TAILCALL
		249	;
		250	; X86-64-LABEL: tailcall:
		251	; X86-64: # %bb.0:
		252	; X86-64-NEXT: jmpq *(%rdi) # TAILCALL
		253	%c = load ptr, ptr %p
		254	tail call void %c()
		255	ret void
		256	}
		257
244	; Don't emit zeroing registers in "main" function.	258	; Don't emit zeroing registers in "main" function.
245	define dso_local i32 @main() local_unnamed_addr #1 {	259	define dso_local i32 @main() local_unnamed_addr #1 {
246	; I386-LABEL: main:	260	; I386-LABEL: main: