negative-stride-fptosi-user.ll
1.8 KB
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-- | FileCheck %s
; LSR previously eliminated the sitofp by introducing an induction
; variable which stepped by a bogus ((double)UINT32_C(-1)). It's theoretically
; possible to eliminate the sitofp using a proper -1.0 step though; this
; test should be changed if that is done.
define void @foo(i32 %N) nounwind {
; CHECK-LABEL: foo:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: pushq %rbp
; CHECK-NEXT: pushq %rbx
; CHECK-NEXT: pushq %rax
; CHECK-NEXT: testl %edi, %edi
; CHECK-NEXT: jns .LBB0_3
; CHECK-NEXT: # %bb.1: # %bb.preheader
; CHECK-NEXT: movl %edi, %ebx
; CHECK-NEXT: xorl %ebp, %ebp
; CHECK-NEXT: .p2align 4, 0x90
; CHECK-NEXT: .LBB0_2: # %bb
; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
; CHECK-NEXT: xorps %xmm0, %xmm0
; CHECK-NEXT: cvtsi2sd %ebp, %xmm0
; CHECK-NEXT: callq bar
; CHECK-NEXT: decl %ebp
; CHECK-NEXT: cmpl %ebp, %ebx
; CHECK-NEXT: jne .LBB0_2
; CHECK-NEXT: .LBB0_3: # %return
; CHECK-NEXT: addq $8, %rsp
; CHECK-NEXT: popq %rbx
; CHECK-NEXT: popq %rbp
; CHECK-NEXT: retq
entry:
%0 = icmp slt i32 %N, 0 ; <i1> [#uses=1]
br i1 %0, label %bb, label %return
bb: ; preds = %bb, %entry
%i.03 = phi i32 [ 0, %entry ], [ %2, %bb ] ; <i32> [#uses=2]
%1 = sitofp i32 %i.03 to double ; <double> [#uses=1]
tail call void @bar(double %1) nounwind
%2 = add nsw i32 %i.03, -1 ; <i32> [#uses=2]
%exitcond = icmp eq i32 %2, %N ; <i1> [#uses=1]
br i1 %exitcond, label %return, label %bb
return: ; preds = %bb, %entry
ret void
}
declare void @bar(double)