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Add test case for mulhi's overflow. NFC 

llvm-svn: 296696
This commit is contained in:
Amaury Sechet 2017-03-01 22:27:21 +00:00
parent aab18c0cfc
commit 250b4a7491
1 changed files with 55 additions and 0 deletions
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llvm/test/CodeGen/X86/overflow.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=i686-unknown-unknown -mattr=+avx | FileCheck %s --check-prefix=X32
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+avx | FileCheck %s --check-prefix=X64
define i1 @mulhioverflow(i64 %a, i64 %b, i64 %c) nounwind {
; X32-LABEL: mulhioverflow:
; X32: # BB#0:
; X32-NEXT: pushl %ebp
; X32-NEXT: movl %esp, %ebp
; X32-NEXT: pushl %esi
; X32-NEXT: andl $-8, %esp
; X32-NEXT: subl $24, %esp
; X32-NEXT: movl 24(%ebp), %esi
; X32-NEXT: movl %esp, %eax
; X32-NEXT: pushl $0
; X32-NEXT: pushl $0
; X32-NEXT: pushl 20(%ebp)
; X32-NEXT: pushl 16(%ebp)
; X32-NEXT: pushl $0
; X32-NEXT: pushl $0
; X32-NEXT: pushl 12(%ebp)
; X32-NEXT: pushl 8(%ebp)
; X32-NEXT: pushl %eax
; X32-NEXT: calll __multi3
; X32-NEXT: addl $32, %esp
; X32-NEXT: movl {{[0-9]+}}(%esp), %eax
; X32-NEXT: andl $1, %esi
; X32-NEXT: addl {{[0-9]+}}(%esp), %esi
; X32-NEXT: adcl $0, %eax
; X32-NEXT: setb %al
; X32-NEXT: leal -4(%ebp), %esp
; X32-NEXT: popl %esi
; X32-NEXT: popl %ebp
; X32-NEXT: retl
;
; X64-LABEL: mulhioverflow:
; X64: # BB#0:
; X64-NEXT: movq %rdx, %rcx
; X64-NEXT: movq %rdi, %rax
; X64-NEXT: mulq %rsi
; X64-NEXT: andl $1, %ecx
; X64-NEXT: addq %rdx, %rcx
; X64-NEXT: setb %al
; X64-NEXT: retq
%1 = zext i64 %a to i128
%2 = zext i64 %b to i128
%3 = mul i128 %1, %2
%4 = lshr i128 %3, 64
%5 = and i64 %c, 1
%6 = zext i64 %5 to i128
%7 = add i128 %4, %6
%8 = lshr i128 %7, 64
%9 = trunc i128 %8 to i1
ret i1 %9
}