llvm-6502/test/CodeGen/SystemZ/atomicrmw-and-01.ll
Richard Sandiford b3cabb44c3 [SystemZ] Use zeroing form of RISBG for some AND sequences
RISBG can handle some ANDs for which no AND IMMEDIATE exists.
It also acts as a three-operand AND for some cases where an
AND IMMEDIATE could be used instead.

It might be worth adding a pass to replace RISBG with AND IMMEDIATE
in cases where the register operands end up being the same and where
AND IMMEDIATE is smaller.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186072 91177308-0d34-0410-b5e6-96231b3b80d8
2013-07-11 08:59:12 +00:00

134 lines
3.8 KiB
LLVM

; Test 8-bit atomic ANDs.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-SHIFT1
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-SHIFT2
; Check AND of a variable.
; - CHECK is for the main loop.
; - CHECK-SHIFT1 makes sure that the negated shift count used by the second
; RLL is set up correctly. The negation is independent of the NILL and L
; tested in CHECK.
; - CHECK-SHIFT2 makes sure that %b is shifted into the high part of the word
; before being used, and that the low bits are set to 1. This sequence is
; independent of the other loop prologue instructions.
define i8 @f1(i8 *%src, i8 %b) {
; CHECK: f1:
; CHECK-DAG: sllg [[SHIFT:%r[1-9]+]], %r2, 3
; CHECK-DAG: risbg [[BASE:%r[1-9]+]], %r2, 0, 189, 0
; CHECK: l [[OLD:%r[0-9]+]], 0([[BASE]])
; CHECK: [[LABEL:\.[^:]*]]:
; CHECK: rll [[ROT:%r[0-9]+]], [[OLD]], 0([[SHIFT]])
; CHECK: nr [[ROT]], %r3
; CHECK: rll [[NEW:%r[0-9]+]], [[ROT]], 0({{%r[1-9]+}})
; CHECK: cs [[OLD]], [[NEW]], 0([[BASE]])
; CHECK: jlh [[LABEL]]
; CHECK: rll %r2, [[OLD]], 8([[SHIFT]])
; CHECK: br %r14
;
; CHECK-SHIFT1: f1:
; CHECK-SHIFT1: sllg [[SHIFT:%r[1-9]+]], %r2, 3
; CHECK-SHIFT1: lcr [[NEGSHIFT:%r[1-9]+]], [[SHIFT]]
; CHECK-SHIFT1: rll
; CHECK-SHIFT1: rll {{%r[0-9]+}}, {{%r[0-9]+}}, 0([[NEGSHIFT]])
; CHECK-SHIFT1: rll
; CHECK-SHIFT1: br %r14
;
; CHECK-SHIFT2: f1:
; CHECK-SHIFT2: sll %r3, 24
; CHECK-SHIFT2: oilf %r3, 16777215
; CHECK-SHIFT2: rll
; CHECK-SHIFT2: nr {{%r[0-9]+}}, %r3
; CHECK-SHIFT2: rll
; CHECK-SHIFT2: rll
; CHECK-SHIFT2: br %r14
%res = atomicrmw and i8 *%src, i8 %b seq_cst
ret i8 %res
}
; Check the minimum signed value. We AND the rotated word with 0x80ffffff.
define i8 @f2(i8 *%src) {
; CHECK: f2:
; CHECK-DAG: sllg [[SHIFT:%r[1-9]+]], %r2, 3
; CHECK-DAG: risbg [[BASE:%r[1-9]+]], %r2, 0, 189, 0
; CHECK: l [[OLD:%r[0-9]+]], 0([[BASE]])
; CHECK: [[LABEL:\.[^:]*]]:
; CHECK: rll [[ROT:%r[0-9]+]], [[OLD]], 0([[SHIFT]])
; CHECK: nilh [[ROT]], 33023
; CHECK: rll [[NEW:%r[0-9]+]], [[ROT]], 0([[NEGSHIFT:%r[1-9]+]])
; CHECK: cs [[OLD]], [[NEW]], 0([[BASE]])
; CHECK: jlh [[LABEL]]
; CHECK: rll %r2, [[OLD]], 8([[SHIFT]])
; CHECK: br %r14
;
; CHECK-SHIFT1: f2:
; CHECK-SHIFT1: sllg [[SHIFT:%r[1-9]+]], %r2, 3
; CHECK-SHIFT1: lcr [[NEGSHIFT:%r[1-9]+]], [[SHIFT]]
; CHECK-SHIFT1: rll
; CHECK-SHIFT1: rll {{%r[0-9]+}}, {{%r[0-9]+}}, 0([[NEGSHIFT]])
; CHECK-SHIFT1: rll
; CHECK-SHIFT1: br %r14
;
; CHECK-SHIFT2: f2:
; CHECK-SHIFT2: br %r14
%res = atomicrmw and i8 *%src, i8 -128 seq_cst
ret i8 %res
}
; Check ANDs of -2 (-1 isn't useful). We AND the rotated word with 0xfeffffff.
define i8 @f3(i8 *%src) {
; CHECK: f3:
; CHECK: nilh [[ROT]], 65279
; CHECK: br %r14
;
; CHECK-SHIFT1: f3:
; CHECK-SHIFT1: br %r14
; CHECK-SHIFT2: f3:
; CHECK-SHIFT2: br %r14
%res = atomicrmw and i8 *%src, i8 -2 seq_cst
ret i8 %res
}
; Check ANDs of 1. We AND the rotated word with 0x01ffffff.
define i8 @f4(i8 *%src) {
; CHECK: f4:
; CHECK: nilh [[ROT]], 511
; CHECK: br %r14
;
; CHECK-SHIFT1: f4:
; CHECK-SHIFT1: br %r14
; CHECK-SHIFT2: f4:
; CHECK-SHIFT2: br %r14
%res = atomicrmw and i8 *%src, i8 1 seq_cst
ret i8 %res
}
; Check the maximum signed value. We AND the rotated word with 0x7fffffff.
define i8 @f5(i8 *%src) {
; CHECK: f5:
; CHECK: nilh [[ROT]], 32767
; CHECK: br %r14
;
; CHECK-SHIFT1: f5:
; CHECK-SHIFT1: br %r14
; CHECK-SHIFT2: f5:
; CHECK-SHIFT2: br %r14
%res = atomicrmw and i8 *%src, i8 127 seq_cst
ret i8 %res
}
; Check ANDs of a large unsigned value. We AND the rotated word with
; 0xfdffffff.
define i8 @f6(i8 *%src) {
; CHECK: f6:
; CHECK: nilh [[ROT]], 65023
; CHECK: br %r14
;
; CHECK-SHIFT1: f6:
; CHECK-SHIFT1: br %r14
; CHECK-SHIFT2: f6:
; CHECK-SHIFT2: br %r14
%res = atomicrmw and i8 *%src, i8 253 seq_cst
ret i8 %res
}