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llvm-project/llvm/test/CodeGen/ARM/machine-cse-cmp.ll

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Allow machine-cse to look across MBB boundary when cse'ing instructions that define physical registers. It's currently very restrictive, only catching cases where the CE is in an immediate (and only) predecessor. But it catches a surprising large number of cases. rdar://10660865 llvm-svn: 147827
2012-01-10 10:02:58 +08:00
; RUN: llc < %s -mtriple=armv7-apple-ios | FileCheck %s
Re-apply 105308 with fix. llvm-svn: 105502
2010-06-05 07:28:13 +08:00
;rdar://8003725
@G1 = external global i32
@G2 = external global i32
define i32 @f1(i32 %cond1, i32 %x1, i32 %x2, i32 %x3) {
entry:
Allow machine-cse to look across MBB boundary when cse'ing instructions that define physical registers. It's currently very restrictive, only catching cases where the CE is in an immediate (and only) predecessor. But it catches a surprising large number of cases. rdar://10660865 llvm-svn: 147827
2012-01-10 10:02:58 +08:00
; CHECK: f1:
Re-apply 105308 with fix. llvm-svn: 105502
2010-06-05 07:28:13 +08:00
; CHECK: cmp
; CHECK: moveq
; CHECK-NOT: cmp
Implement ARMBaseInstrInfo::commuteInstruction() for MOVCCr. A MOVCCr instruction can be commuted by inverting the condition. This can help reduce register pressure and remove unnecessary copies in some cases. <rdar://problem/11182914> llvm-svn: 154033
2012-04-05 02:23:42 +08:00
; CHECK: mov{{eq|ne}}
Re-apply 105308 with fix. llvm-svn: 105502
2010-06-05 07:28:13 +08:00
%tmp1 = icmp eq i32 %cond1, 0
%tmp2 = select i1 %tmp1, i32 %x1, i32 %x2
%tmp3 = select i1 %tmp1, i32 %x2, i32 %x3
%tmp4 = add i32 %tmp2, %tmp3
ret i32 %tmp4
}
Allow machine-cse to look across MBB boundary when cse'ing instructions that define physical registers. It's currently very restrictive, only catching cases where the CE is in an immediate (and only) predecessor. But it catches a surprising large number of cases. rdar://10660865 llvm-svn: 147827
2012-01-10 10:02:58 +08:00
@foo = external global i32
@bar = external global [250 x i8], align 1
; CSE of cmp across BB boundary
; rdar://10660865
define void @f2() nounwind ssp {
entry:
; CHECK: f2:
; CHECK: cmp
; CHECK: poplt
; CHECK-NOT: cmp
; CHECK: movle
%0 = load i32* @foo, align 4
%cmp28 = icmp sgt i32 %0, 0
br i1 %cmp28, label %for.body.lr.ph, label %for.cond1.preheader
for.body.lr.ph: ; preds = %entry
%1 = icmp sgt i32 %0, 1
%smax = select i1 %1, i32 %0, i32 1
call void @llvm.memset.p0i8.i32(i8* getelementptr inbounds ([250 x i8]* @bar, i32 0, i32 0), i8 0, i32 %smax, i32 1, i1 false)
unreachable
for.cond1.preheader: ; preds = %entry
ret void
}
declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i32, i1) nounwind