forked from OSchip/llvm-project
123 lines
3.9 KiB
LLVM
123 lines
3.9 KiB
LLVM
; RUN: llc %s -o - -enable-shrink-wrap=true | FileCheck %s --check-prefix=CHECK --check-prefix=ENABLE
|
|
; RUN: llc %s -o - -enable-shrink-wrap=false | FileCheck %s --check-prefix=CHECK --check-prefix=DISABLE
|
|
|
|
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
|
|
target triple = "x86_64--windows-gnu"
|
|
|
|
; The output of this function with or without shrink-wrapping
|
|
; shouldn't change.
|
|
; Indeed, the epilogue block would have been if.else, meaning
|
|
; after the pops, we will have additional instruction (jump, mov,
|
|
; etc.) prior to the return and this is forbidden for Win64.
|
|
; CHECK-LABEL: loopInfoSaveOutsideLoop:
|
|
; CHECK: push
|
|
; CHECK-NOT: popq
|
|
; CHECK: popq
|
|
; CHECK-NOT: popq
|
|
; CHECK-NEXT: retq
|
|
define i32 @loopInfoSaveOutsideLoop(i32 %cond, i32 %N) #0 {
|
|
entry:
|
|
%tobool = icmp eq i32 %cond, 0
|
|
br i1 %tobool, label %if.else, label %for.preheader
|
|
|
|
for.preheader: ; preds = %entry
|
|
tail call void asm "nop", ""()
|
|
br label %for.body
|
|
|
|
for.body: ; preds = %for.body, %for.preheader
|
|
%i.05 = phi i32 [ %inc, %for.body ], [ 0, %for.preheader ]
|
|
%sum.04 = phi i32 [ %add, %for.body ], [ 0, %for.preheader ]
|
|
%call = tail call i32 asm "movl $$1, $0", "=r,~{ebx}"()
|
|
%add = add nsw i32 %call, %sum.04
|
|
%inc = add nuw nsw i32 %i.05, 1
|
|
%exitcond = icmp eq i32 %inc, 10
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end: ; preds = %for.body
|
|
tail call void asm "nop", "~{ebx}"()
|
|
%shl = shl i32 %add, 3
|
|
br label %if.end
|
|
|
|
if.else: ; preds = %entry
|
|
%mul = shl nsw i32 %N, 1
|
|
br label %if.end
|
|
|
|
if.end: ; preds = %if.else, %for.end
|
|
%sum.1 = phi i32 [ %shl, %for.end ], [ %mul, %if.else ]
|
|
ret i32 %sum.1
|
|
}
|
|
|
|
; When we can sink the epilogue of the function into an existing exit block,
|
|
; this is Ok for shrink-wrapping to kicks in.
|
|
; CHECK-LABEL: loopInfoSaveOutsideLoop2:
|
|
; ENABLE: testl %ecx, %ecx
|
|
; ENABLE-NEXT: je [[ELSE_LABEL:.LBB[0-9_]+]]
|
|
;
|
|
; Prologue code.
|
|
; Make sure we save the CSR used in the inline asm: rbx.
|
|
; CHECK: pushq %rbx
|
|
;
|
|
; DISABLE: testl %ecx, %ecx
|
|
; DISABLE-NEXT: je [[ELSE_LABEL:.LBB[0-9_]+]]
|
|
;
|
|
; CHECK: nop
|
|
; CHECK: xorl [[SUM:%eax]], [[SUM]]
|
|
; CHECK-NEXT: movl $10, [[IV:%e[a-z]+]]
|
|
;
|
|
; CHECK: [[LOOP_LABEL:.LBB[0-9_]+]]: # %for.body
|
|
; CHECK: movl $1, [[TMP:%e[a-z]+]]
|
|
; CHECK: addl [[TMP]], [[SUM]]
|
|
; CHECK-NEXT: decl [[IV]]
|
|
; CHECK-NEXT: jne [[LOOP_LABEL]]
|
|
; Next BB.
|
|
; CHECK: nop
|
|
; CHECK: shll $3, [[SUM]]
|
|
;
|
|
; DISABLE: jmp [[EPILOG_BB:.LBB[0-9_]+]]
|
|
;
|
|
; ENABLE-NEXT: popq %rbx
|
|
; ENABLE-NEXT: retq
|
|
;
|
|
; CHECK: [[ELSE_LABEL]]: # %if.else
|
|
; Shift second argument by one and store into returned register.
|
|
; CHECK: addl %edx, %edx
|
|
; CHECK: movl %edx, %eax
|
|
;
|
|
; DISABLE: [[EPILOG_BB]]: # %if.end
|
|
; DISABLE-NEXT: popq %rbx
|
|
;
|
|
; CHECK: retq
|
|
;
|
|
define i32 @loopInfoSaveOutsideLoop2(i32 %cond, i32 %N) #0 {
|
|
entry:
|
|
%tobool = icmp eq i32 %cond, 0
|
|
br i1 %tobool, label %if.else, label %for.preheader
|
|
|
|
for.preheader: ; preds = %entry
|
|
tail call void asm "nop", ""()
|
|
br label %for.body
|
|
|
|
for.body: ; preds = %for.body, %for.preheader
|
|
%i.05 = phi i32 [ %inc, %for.body ], [ 0, %for.preheader ]
|
|
%sum.04 = phi i32 [ %add, %for.body ], [ 0, %for.preheader ]
|
|
%call = tail call i32 asm "movl $$1, $0", "=r,~{ebx}"()
|
|
%add = add nsw i32 %call, %sum.04
|
|
%inc = add nuw nsw i32 %i.05, 1
|
|
%exitcond = icmp eq i32 %inc, 10
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end: ; preds = %for.body
|
|
tail call void asm "nop", "~{ebx}"()
|
|
%shl = shl i32 %add, 3
|
|
ret i32 %shl
|
|
|
|
if.else: ; preds = %entry
|
|
%mul = shl nsw i32 %N, 1
|
|
br label %if.end
|
|
|
|
if.end: ; preds = %if.else, %for.end
|
|
ret i32 %mul
|
|
}
|
|
|
|
attributes #0 = { uwtable }
|