llvm-mirror/test/CodeGen/AArch64/fast-isel-folding.ll
Mehdi Amini 32875af6e3 Change the fast-isel-abort option from bool to int to enable "levels"
Summary:
Currently fast-isel-abort will only abort for regular instructions,
and just warn for function calls, terminators, function arguments.
There is already fast-isel-abort-args but nothing for calls and
terminators.

This change turns the fast-isel-abort options into an integer option,
so that multiple levels of strictness can be defined.
This will help no being surprised when the "abort" option indeed does
not abort, and enables the possibility to write test that verifies
that no intrinsics are forgotten by fast-isel.

Reviewers: resistor, echristo

Subscribers: jfb, llvm-commits

Differential Revision: http://reviews.llvm.org/D7941

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 230775
2015-02-27 18:32:11 +00:00

55 lines
1.1 KiB
LLVM

; RUN: llc -mtriple=aarch64-apple-darwin -O0 -fast-isel-abort=1 -verify-machineinstrs < %s
; Test that we don't fold the shift.
define i64 @fold_shift_test(i64 %a, i1 %c) {
%1 = sub i64 %a, 8
%2 = ashr i64 %1, 3
br i1 %c, label %bb1, label %bb2
bb1:
%3 = icmp ult i64 0, %2
br i1 %3, label %bb2, label %bb3
bb2:
ret i64 1
bb3:
ret i64 2
}
; Test that we don't fold the sign-extend.
define i64 @fold_sext_test1(i32 %a, i1 %c) {
%1 = sub i32 %a, 8
%2 = sext i32 %1 to i64
br i1 %c, label %bb1, label %bb2
bb1:
%3 = icmp ult i64 0, %2
br i1 %3, label %bb2, label %bb3
bb2:
ret i64 1
bb3:
ret i64 2
}
; Test that we don't fold the sign-extend.
define i64 @fold_sext_test2(i32 %a, i1 %c) {
%1 = sub i32 %a, 8
%2 = sext i32 %1 to i64
br i1 %c, label %bb1, label %bb2
bb1:
%3 = shl i64 %2, 4
ret i64 %3
bb2:
ret i64 %2
}
; Test that we clear the kill flag.
define i32 @fold_kill_test(i32 %a) {
%1 = sub i32 %a, 8
%2 = shl i32 %1, 3
%3 = icmp ult i32 0, %2
br i1 %3, label %bb1, label %bb2
bb1:
ret i32 %2
bb2:
%4 = add i32 %2, 4
ret i32 %4
}