Add test case for mulhi's overflow. NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296696 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/overflow.ll b/test/CodeGen/X86/overflow.ll
new file mode 100644 (file)
index 0000000..7e67b9d
--- /dev/null
+++ b/test/CodeGen/X86/overflow.ll
@@ -0,0 +1,55 @@
+; 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
+}