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llvm-project/llvm/test/CodeGen/Thumb2/bicbfi.ll

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[Thumb] Reapply r272251 with a fix for PR28348 (mk 2) The important thing I was missing was ensuring newly added constants were kept in topological order. Repositioning the node is correct if the constant is newly added (so it has no topological ordering) but wrong if it already existed - positioning it next in the worklist would break the topological ordering. Original commit message: [Thumb] Select a BIC instead of AND if the immediate can be encoded more optimally negated If an immediate is only used in an AND node, it is possible that the immediate can be more optimally materialized when negated. If this is the case, we can negate the immediate and use a BIC instead; int i(int a) { return a & 0xfffffeec; } Used to produce: ldr r1, [CONSTPOOL] ands r0, r1 CONSTPOOL: 0xfffffeec And now produces: movs r1, #255 adds r1, #20 ; Less costly immediate generation bics r0, r1 llvm-svn: 274543
2016-07-05 20:37:13 +08:00
; RUN: llc < %s | FileCheck %s
target datalayout = "e-m:e-p:32:32-i1:8:32-i8:8:32-i16:16:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "thumbv7--linux-gnueabihf"
; CHECK-LABEL: f:
; CHECK: bic
define void @f(i32* nocapture %b, i32* nocapture %c, i32 %a) {
%1 = and i32 %a, -4096
store i32 %1, i32* %c, align 4
%2 = and i32 %a, 4095
%3 = or i32 %2, 4096
%4 = load i32, i32* %b, align 4
%5 = add nsw i32 %4, %3
store i32 %5, i32* %b, align 4
ret void
[CodeGen] Always use `printReg` to print registers in both MIR and debug output As part of the unification of the debug format and the MIR format, always use `printReg` to print all kinds of registers. Updated the tests using '_' instead of '%noreg' until we decide which one we want to be the default one. Differential Revision: https://reviews.llvm.org/D40421 llvm-svn: 319445
2017-12-01 00:12:24 +08:00
}