From 2880f2df26a37ba10b26701f16f111e6a783e73f Mon Sep 17 00:00:00 2001
From: Amaury Sechet <deadalnix@gmail.com>
Date: Wed, 1 Mar 2017 23:31:19 +0000
Subject: [PATCH] Improve mulhi overflow test. NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296709 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/X86/overflow.ll | 39 +++++++++++++++++++++++++--------------
 1 file changed, 25 insertions(+), 14 deletions(-)

diff --git a/test/CodeGen/X86/overflow.ll b/test/CodeGen/X86/overflow.ll
index 7e67b9df469..37ca5e1c0eb 100644
--- a/test/CodeGen/X86/overflow.ll
+++ b/test/CodeGen/X86/overflow.ll
@@ -2,36 +2,47 @@
 ; 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 {
+define i128 @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 %edi
 ; X32-NEXT:    pushl %esi
 ; X32-NEXT:    andl $-8, %esp
-; X32-NEXT:    subl $24, %esp
-; X32-NEXT:    movl 24(%ebp), %esi
+; X32-NEXT:    subl $16, %esp
+; X32-NEXT:    movl 8(%ebp), %esi
+; X32-NEXT:    movl 28(%ebp), %edi
 ; X32-NEXT:    movl %esp, %eax
 ; X32-NEXT:    pushl $0
 ; X32-NEXT:    pushl $0
+; X32-NEXT:    pushl 24(%ebp)
 ; X32-NEXT:    pushl 20(%ebp)
-; X32-NEXT:    pushl 16(%ebp)
 ; X32-NEXT:    pushl $0
 ; X32-NEXT:    pushl $0
+; X32-NEXT:    pushl 16(%ebp)
 ; 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:    andl $1, %edi
+; X32-NEXT:    xorl %ecx, %ecx
+; X32-NEXT:    addl {{[0-9]+}}(%esp), %edi
 ; X32-NEXT:    adcl $0, %eax
-; X32-NEXT:    setb %al
-; X32-NEXT:    leal -4(%ebp), %esp
+; X32-NEXT:    adcl $0, %ecx
+; X32-NEXT:    sbbl %edx, %edx
+; X32-NEXT:    andl $1, %edx
+; X32-NEXT:    movl %edi, (%esi)
+; X32-NEXT:    movl %eax, 4(%esi)
+; X32-NEXT:    movl %ecx, 8(%esi)
+; X32-NEXT:    movl %edx, 12(%esi)
+; X32-NEXT:    movl %esi, %eax
+; X32-NEXT:    leal -8(%ebp), %esp
 ; X32-NEXT:    popl %esi
+; X32-NEXT:    popl %edi
 ; X32-NEXT:    popl %ebp
-; X32-NEXT:    retl
+; X32-NEXT:    retl $4
 ;
 ; X64-LABEL: mulhioverflow:
 ; X64:       # BB#0:
@@ -40,7 +51,9 @@ define i1 @mulhioverflow(i64 %a, i64 %b, i64 %c) nounwind {
 ; X64-NEXT:    mulq %rsi
 ; X64-NEXT:    andl $1, %ecx
 ; X64-NEXT:    addq %rdx, %rcx
-; X64-NEXT:    setb %al
+; X64-NEXT:    sbbq %rdx, %rdx
+; X64-NEXT:    andl $1, %edx
+; X64-NEXT:    movq %rcx, %rax
 ; X64-NEXT:    retq
   %1 = zext i64 %a to i128
   %2 = zext i64 %b to i128
@@ -49,7 +62,5 @@ define i1 @mulhioverflow(i64 %a, i64 %b, i64 %c) nounwind {
   %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
+  ret i128 %7
 }
-- 
2.11.0