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66e4833ec7
For the following case:
t8: i32 = or t7, t4
t10: i32 = ORRWrs t8, t8, TargetConstant:i32<73>
Current code wrongly returns (t8 >> shiftConstant) as the
UsefulBits of t8, which in fact is (t8 | (t8 >> shiftConstant)).
Reviewed by: sdesmalen, mdchen
Differential Revision: https://reviews.llvm.org/D102759
47 lines
1.3 KiB
LLVM
47 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=aarch64-unknown-linux-gnu -o - | FileCheck %s
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; ModuleID = '<stdin>'
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source_filename = "<stdin>"
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target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64-unknown-linux-gnu"
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define i32 @Orlshr(i32 %e) {
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; CHECK-LABEL: Orlshr:
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; CHECK: // %bb.0: // %entry
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; CHECK-NEXT: orr w8, w0, w0, lsr #15
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; CHECK-NEXT: orr w8, w8, w8, lsr #15
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; CHECK-NEXT: orr w8, w8, w8, lsr #15
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; CHECK-NEXT: orr w0, w8, w8, lsr #15
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; CHECK-NEXT: ret
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entry:
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%shr = lshr i32 %e, 15
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%or = or i32 %shr, %e
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%shr.1 = lshr i32 %or, 15
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%or.1 = or i32 %shr.1, %or
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%shr.2 = lshr i32 %or.1, 15
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%or.2 = or i32 %shr.2, %or.1
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%shr.3 = lshr i32 %or.2, 15
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%or.3 = or i32 %shr.3, %or.2
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ret i32 %or.3
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}
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define i32 @Orshl(i32 %e) {
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; CHECK-LABEL: Orshl:
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; CHECK: // %bb.0: // %entry
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; CHECK-NEXT: orr w8, w0, w0, lsl #15
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; CHECK-NEXT: orr w8, w8, w8, lsl #15
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; CHECK-NEXT: orr w8, w8, w8, lsl #15
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; CHECK-NEXT: orr w0, w8, w8, lsl #15
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; CHECK-NEXT: ret
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entry:
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%shl = shl i32 %e, 15
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%or = or i32 %shl, %e
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%shl.1 = shl i32 %or, 15
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%or.1 = or i32 %shl.1, %or
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%shl.2 = shl i32 %or.1, 15
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%or.2 = or i32 %shl.2, %or.1
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%shl.3 = shl i32 %or.2, 15
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%or.3 = or i32 %shl.3, %or.2
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ret i32 %or.3
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}
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