73a6cd4b6b
This hints the operand of a t2DoLoopStart towards using LR, which can help make it more likely to become t2DLS lr, lr. This makes it easier to move if needed (as the input is the same as the output), or potentially remove entirely. The hint is added after others (from COPY's etc) which still take precedence. It needed to find a place to add the hint, which currently uses the post isel custom inserter. Differential Revision: https://reviews.llvm.org/D89883
214 lines
8.5 KiB
LLVM
214 lines
8.5 KiB
LLVM
; RUN: llc -mtriple=thumbv8.1m.main -disable-arm-loloops=false -mattr=+lob -stop-after=arm-low-overhead-loops --verify-machineinstrs %s -o - | FileCheck %s
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; RUN: llc -mtriple=thumbv8.1m.main -disable-arm-loloops=false -mattr=+lob -stop-after=arm-low-overhead-loops --verify-machineinstrs %s -o - | FileCheck %s --check-prefix=CHECK-GLOBAL
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; Not implemented as a mir test so that changes the generic HardwareLoop can
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; also be tested. These functions have been taken from
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; Transforms/HardwareLoops/loop-guards.ll in which can be seen the generation
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; of a few test.set intrinsics, but only one (ne_trip_count) gets generated
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; here. Simplifications result in icmps changing and maybe also the CFG. So,
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; TODO: Teach the HardwareLoops some better pattern recognition.
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; CHECK-GLOBAL-NOT: DoLoopStart
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; CHECK-GLOBAL-NOT: WhileLoopStart
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; CHECK-GLOBAL-NOT: LoopEnd
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; CHECK: ne_and_guard
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; CHECK: body:
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; CHECK: bb.0.entry:
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; CHECK: t2CMPri renamable $lr, 0
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; CHECK: tBcc %bb.4
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; CHECK: bb.2.while.body.preheader:
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; CHECK: $lr = t2DLS killed renamable $lr
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; CHECK: bb.3.while.body:
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; CHECK: $lr = t2LEUpdate killed renamable $lr, %bb.3
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define void @ne_and_guard(i1 zeroext %t1, i1 zeroext %t2, i32* nocapture %a, i32* nocapture readonly %b, i32 %N) {
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entry:
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%brmerge.demorgan = and i1 %t1, %t2
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%cmp6 = icmp ne i32 %N, 0
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%or.cond = and i1 %brmerge.demorgan, %cmp6
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br i1 %or.cond, label %while.body, label %if.end
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while.body: ; preds = %while.body, %entry
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%i.09 = phi i32 [ %inc, %while.body ], [ 0, %entry ]
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%a.addr.08 = phi i32* [ %incdec.ptr3, %while.body ], [ %a, %entry ]
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%b.addr.07 = phi i32* [ %incdec.ptr, %while.body ], [ %b, %entry ]
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%incdec.ptr = getelementptr inbounds i32, i32* %b.addr.07, i32 1
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%tmp = load i32, i32* %b.addr.07, align 4
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%incdec.ptr3 = getelementptr inbounds i32, i32* %a.addr.08, i32 1
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store i32 %tmp, i32* %a.addr.08, align 4
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%inc = add nuw i32 %i.09, 1
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%exitcond = icmp eq i32 %inc, %N
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br i1 %exitcond, label %if.end, label %while.body
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if.end: ; preds = %while.body, %entry
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ret void
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}
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; TODO: This could generate WLS
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; CHECK: ne_preheader
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; CHECK: body:
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; CHECK: bb.0.entry:
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; CHECK: t2CMPri renamable $lr, 0
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; CHECK: tBcc %bb.4
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; CHECK: bb.2.while.body.preheader:
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; CHECK: $lr = t2DLS killed renamable $lr
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; CHECK: bb.3.while.body:
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; CHECK: $lr = t2LEUpdate killed renamable $lr, %bb.3
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define void @ne_preheader(i1 zeroext %t1, i1 zeroext %t2, i32* nocapture %a, i32* nocapture readonly %b, i32 %N) {
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entry:
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%brmerge.demorgan = and i1 %t1, %t2
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br i1 %brmerge.demorgan, label %while.preheader, label %if.end
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while.preheader: ; preds = %entry
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%cmp = icmp ne i32 %N, 0
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br i1 %cmp, label %while.body, label %if.end
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while.body: ; preds = %while.body, %while.preheader
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%i.09 = phi i32 [ %inc, %while.body ], [ 0, %while.preheader ]
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%a.addr.08 = phi i32* [ %incdec.ptr3, %while.body ], [ %a, %while.preheader ]
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%b.addr.07 = phi i32* [ %incdec.ptr, %while.body ], [ %b, %while.preheader ]
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%incdec.ptr = getelementptr inbounds i32, i32* %b.addr.07, i32 1
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%tmp = load i32, i32* %b.addr.07, align 4
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%incdec.ptr3 = getelementptr inbounds i32, i32* %a.addr.08, i32 1
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store i32 %tmp, i32* %a.addr.08, align 4
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%inc = add nuw i32 %i.09, 1
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%exitcond = icmp eq i32 %inc, %N
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br i1 %exitcond, label %if.end, label %while.body
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if.end: ; preds = %while.body, %while.preheader, %entry
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ret void
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}
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; TODO: This could generate WLS
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; CHECK: eq_preheader
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; CHECK: body:
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; CHECK: bb.0.entry:
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; CHECK: t2CMPri renamable $lr, 0
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; CHECK: tBcc %bb.4
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; CHECK: bb.2.while.body.preheader:
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; CHECK: $lr = t2DLS killed renamable $lr
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; CHECK: bb.3.while.body:
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; CHECK: $lr = t2LEUpdate killed renamable $lr, %bb.3
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define void @eq_preheader(i1 zeroext %t1, i1 zeroext %t2, i32* nocapture %a, i32* nocapture readonly %b, i32 %N) {
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entry:
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%brmerge.demorgan = and i1 %t1, %t2
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br i1 %brmerge.demorgan, label %while.preheader, label %if.end
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while.preheader: ; preds = %entry
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%cmp = icmp eq i32 %N, 0
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br i1 %cmp, label %if.end, label %while.body
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while.body: ; preds = %while.body, %while.preheader
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%i.09 = phi i32 [ %inc, %while.body ], [ 0, %while.preheader ]
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%a.addr.08 = phi i32* [ %incdec.ptr3, %while.body ], [ %a, %while.preheader ]
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%b.addr.07 = phi i32* [ %incdec.ptr, %while.body ], [ %b, %while.preheader ]
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%incdec.ptr = getelementptr inbounds i32, i32* %b.addr.07, i32 1
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%tmp = load i32, i32* %b.addr.07, align 4
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%incdec.ptr3 = getelementptr inbounds i32, i32* %a.addr.08, i32 1
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store i32 %tmp, i32* %a.addr.08, align 4
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%inc = add nuw i32 %i.09, 1
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%exitcond = icmp eq i32 %inc, %N
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br i1 %exitcond, label %if.end, label %while.body
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if.end: ; preds = %while.body, %while.preheader, %entry
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ret void
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}
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; TODO: This could generate WLS
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; CHECK: ne_prepreheader
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; CHECK: body:
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; CHECK: bb.0.entry:
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; CHECK: t2CMPri renamable $lr, 0
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; CHECK: tBcc %bb.4
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; CHECK: bb.2.while.body.preheader:
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; CHECK: $lr = t2DLS killed renamable $lr
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; CHECK: bb.3.while.body:
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; CHECK: $lr = t2LEUpdate killed renamable $lr, %bb.3
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define void @ne_prepreheader(i1 zeroext %t1, i1 zeroext %t2, i32* nocapture %a, i32* nocapture readonly %b, i32 %N) {
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entry:
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%cmp = icmp ne i32 %N, 0
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br i1 %cmp, label %while.preheader, label %if.end
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while.preheader: ; preds = %entry
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%brmerge.demorgan = and i1 %t1, %t2
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br i1 %brmerge.demorgan, label %while.body, label %if.end
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while.body: ; preds = %while.body, %while.preheader
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%i.09 = phi i32 [ %inc, %while.body ], [ 0, %while.preheader ]
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%a.addr.08 = phi i32* [ %incdec.ptr3, %while.body ], [ %a, %while.preheader ]
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%b.addr.07 = phi i32* [ %incdec.ptr, %while.body ], [ %b, %while.preheader ]
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%incdec.ptr = getelementptr inbounds i32, i32* %b.addr.07, i32 1
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%tmp = load i32, i32* %b.addr.07, align 4
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%incdec.ptr3 = getelementptr inbounds i32, i32* %a.addr.08, i32 1
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store i32 %tmp, i32* %a.addr.08, align 4
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%inc = add nuw i32 %i.09, 1
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%exitcond = icmp eq i32 %inc, %N
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br i1 %exitcond, label %if.end, label %while.body
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if.end: ; preds = %while.body, %while.preheader, %entry
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ret void
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}
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; CHECK: be_ne
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; CHECK: body:
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; CHECK: bb.0.entry:
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; CHECK: $lr = t2DLS killed renamable $r12
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; CHECK: bb.2.do.body:
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; CHECK: $lr = t2LEUpdate killed renamable $lr, %bb.2
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define void @be_ne(i32* nocapture %a, i32* nocapture readonly %b, i32 %N) {
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entry:
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%cmp = icmp ne i32 %N, 0
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%sub = sub i32 %N, 1
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%be = select i1 %cmp, i32 0, i32 %sub
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%cmp.1 = icmp ne i32 %be, 0
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br i1 %cmp.1, label %do.body, label %if.end
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do.body: ; preds = %do.body, %entry
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%b.addr.0 = phi i32* [ %incdec.ptr, %do.body ], [ %b, %entry ]
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%a.addr.0 = phi i32* [ %incdec.ptr3, %do.body ], [ %a, %entry ]
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%i.0 = phi i32 [ %inc, %do.body ], [ 0, %entry ]
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%incdec.ptr = getelementptr inbounds i32, i32* %b.addr.0, i32 1
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%tmp = load i32, i32* %b.addr.0, align 4
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%incdec.ptr3 = getelementptr inbounds i32, i32* %a.addr.0, i32 1
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store i32 %tmp, i32* %a.addr.0, align 4
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%inc = add nuw i32 %i.0, 1
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%cmp.2 = icmp ult i32 %inc, %N
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br i1 %cmp.2, label %do.body, label %if.end
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if.end: ; preds = %do.body, %entry
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ret void
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}
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; TODO: Remove the tMOVr in the preheader!
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; CHECK: ne_trip_count
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; CHECK: body:
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; CHECK: bb.0.entry:
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; CHECK: $lr = t2WLS $r3, %bb.3
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; CHECK: bb.1.do.body.preheader:
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; CHECK: $lr = tMOVr
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; CHECK: bb.2.do.body:
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; CHECK: $lr = t2LEUpdate killed renamable $lr, %bb.2
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define void @ne_trip_count(i1 zeroext %t1, i32* nocapture %a, i32* nocapture readonly %b, i32 %N) {
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entry:
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br label %do.body.preheader
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do.body.preheader:
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%cmp = icmp ne i32 %N, 0
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br i1 %cmp, label %do.body, label %if.end
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do.body:
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%b.addr.0 = phi i32* [ %incdec.ptr, %do.body ], [ %b, %do.body.preheader ]
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%a.addr.0 = phi i32* [ %incdec.ptr3, %do.body ], [ %a, %do.body.preheader ]
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%i.0 = phi i32 [ %inc, %do.body ], [ 0, %do.body.preheader ]
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%incdec.ptr = getelementptr inbounds i32, i32* %b.addr.0, i32 1
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%tmp = load i32, i32* %b.addr.0, align 4
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%incdec.ptr3 = getelementptr inbounds i32, i32* %a.addr.0, i32 1
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store i32 %tmp, i32* %a.addr.0, align 4
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%inc = add nuw i32 %i.0, 1
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%cmp.1 = icmp ult i32 %inc, %N
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br i1 %cmp.1, label %do.body, label %if.end
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if.end: ; preds = %do.body, %entry
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ret void
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}
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