ba9f245b0d
We currently seem to underestimate the size of functions with loops in them, both in terms of absolute code size and in the difficulties of dealing with such code. (Calls, for example, can be tail merged to further reduce codesize). At -Oz, we can then increase code size by inlining small loops multiple times. This attempts to penalise functions with loops at -Oz by adding a CallPenalty for each top level loop in the function. It uses LI (and hence DT) to calculate the number of loops. As we are dealing with minsize, the inline threshold is small and functions at this point should be relatively small, making the construction of these cheap. Differential Revision: https://reviews.llvm.org/D52716 llvm-svn: 346134
96 lines
3.3 KiB
LLVM
96 lines
3.3 KiB
LLVM
; RUN: opt -inline %s -S | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv7m-arm-none-eabi"
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; CHECK-LABEL: void @doCalls
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define void @doCalls(i8* nocapture %p1, i8* nocapture %p2, i32 %n) #0 {
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entry:
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%div = lshr i32 %n, 1
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; CHECK: call void @LoopCall
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tail call void @LoopCall(i8* %p1, i8* %p2, i32 %div) #0
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%div2 = lshr i32 %n, 2
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; CHECK: call void @LoopCall
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tail call void @LoopCall(i8* %p1, i8* %p2, i32 %div2) #0
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; CHECK-NOT: call void @LoopCall
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tail call void @LoopCall(i8* %p2, i8* %p1, i32 0) #0
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; CHECK-NOT: call void @LoopCall_internal
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tail call void @LoopCall_internal(i8* %p1, i8* %p2, i32 %div2) #0
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%div3 = lshr i32 %n, 4
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; CHECK-NOT: call void @SimpleCall
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tail call void @SimpleCall(i8* %p2, i8* %p1, i32 %div3) #0
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ret void
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}
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; CHECK-LABEL: define void @LoopCall
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define void @LoopCall(i8* nocapture %dest, i8* nocapture readonly %source, i32 %num) #0 {
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entry:
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%c = icmp ne i32 %num, 0
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br i1 %c, label %while.cond, label %while.end
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while.cond: ; preds = %while.body, %entry
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%num.addr.0 = phi i32 [ %num, %entry ], [ %dec, %while.body ]
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%p_dest.0 = phi i8* [ %dest, %entry ], [ %incdec.ptr2, %while.body ]
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%p_source.0 = phi i8* [ %source, %entry ], [ %incdec.ptr, %while.body ]
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%cmp = icmp eq i32 %num.addr.0, 0
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br i1 %cmp, label %while.end, label %while.body
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while.body: ; preds = %while.cond
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%incdec.ptr = getelementptr inbounds i8, i8* %p_source.0, i32 1
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%0 = load i8, i8* %p_source.0, align 1
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%1 = trunc i32 %num.addr.0 to i8
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%conv1 = add i8 %0, %1
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%incdec.ptr2 = getelementptr inbounds i8, i8* %p_dest.0, i32 1
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store i8 %conv1, i8* %p_dest.0, align 1
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%dec = add i32 %num.addr.0, -1
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br label %while.cond
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while.end: ; preds = %while.cond
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ret void
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}
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; CHECK-LABEL-NOT: define void @LoopCall_internal
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define internal void @LoopCall_internal(i8* nocapture %dest, i8* nocapture readonly %source, i32 %num) #0 {
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entry:
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%c = icmp ne i32 %num, 0
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br i1 %c, label %while.cond, label %while.end
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while.cond: ; preds = %while.body, %entry
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%num.addr.0 = phi i32 [ %num, %entry ], [ %dec, %while.body ]
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%p_dest.0 = phi i8* [ %dest, %entry ], [ %incdec.ptr2, %while.body ]
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%p_source.0 = phi i8* [ %source, %entry ], [ %incdec.ptr, %while.body ]
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%cmp = icmp eq i32 %num.addr.0, 0
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br i1 %cmp, label %while.end, label %while.body
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while.body: ; preds = %while.cond
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%incdec.ptr = getelementptr inbounds i8, i8* %p_source.0, i32 1
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%0 = load i8, i8* %p_source.0, align 1
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%1 = trunc i32 %num.addr.0 to i8
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%conv1 = add i8 %0, %1
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%incdec.ptr2 = getelementptr inbounds i8, i8* %p_dest.0, i32 1
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store i8 %conv1, i8* %p_dest.0, align 1
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%dec = add i32 %num.addr.0, -1
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br label %while.cond
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while.end: ; preds = %while.cond
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ret void
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}
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; CHECK-LABEL: define void @SimpleCall
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define void @SimpleCall(i8* nocapture %dest, i8* nocapture readonly %source, i32 %num) #0 {
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entry:
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%arrayidx = getelementptr inbounds i8, i8* %source, i32 %num
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%0 = load i8, i8* %arrayidx, align 1
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%1 = xor i8 %0, 127
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%arrayidx2 = getelementptr inbounds i8, i8* %dest, i32 %num
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store i8 %1, i8* %arrayidx2, align 1
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ret void
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}
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attributes #0 = { minsize optsize }
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