mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 19:52:54 +01:00
629f4d87cb
This fix checks first if the instruction to be folded (e.g. sign-/zero-extend, or shift) is in the same machine basic block as the instruction we are folding into. Not doing so can result in incorrect code, because the value might not be live-out of the basic block, where the value is defined. This fixes rdar://problem/18169495. llvm-svn: 216700
55 lines
1.1 KiB
LLVM
55 lines
1.1 KiB
LLVM
; RUN: llc -mtriple=aarch64-apple-darwin -O0 -fast-isel-abort -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
|
|
}
|