mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-13 20:32:21 +00:00
8615ab4a4a
Fixes PR18753 and PR18782. This is necessary for LICM to preserve LCSSA correctly and efficiently. There is still some active discussion about whether we should be using LCSSA, but we can't just immediately stop using it and we *need* LICM to preserve it while we are using it. We can restore the old SSAUpdater driven code if and when there is a serious effort to remove the reliance on LCSSA from all of the loop passes. However, this also serves as a great example of why LCSSA is very nice to have. This change significantly simplifies the process of sinking instructions for LICM, and makes it quite a bit less expensive. It wouldn't even be as complex as it is except that I had to start the process of removing the big recursive LCSSA formation hammer in order to switch even this much of the re-forming code to asserting that LCSSA was preserved. I'll fully remove that next just to tidy things up until the LCSSA debate settles one way or the other. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201148 91177308-0d34-0410-b5e6-96231b3b80d8
320 lines
8.4 KiB
LLVM
320 lines
8.4 KiB
LLVM
; RUN: opt < %s -basicaa -licm -S | FileCheck %s
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declare i32 @strlen(i8*) readonly
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declare void @foo()
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; Sink readonly function.
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define i32 @test1(i8* %P) {
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br label %Loop
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Loop: ; preds = %Loop, %0
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%A = call i32 @strlen( i8* %P ) readonly
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br i1 false, label %Loop, label %Out
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Out: ; preds = %Loop
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ret i32 %A
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; CHECK-LABEL: @test1(
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; CHECK: Out:
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; CHECK-NEXT: call i32 @strlen
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; CHECK-NEXT: ret i32 %A
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}
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declare double @sin(double) readnone
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; Sink readnone function out of loop with unknown memory behavior.
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define double @test2(double %X) {
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br label %Loop
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Loop: ; preds = %Loop, %0
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call void @foo( )
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%A = call double @sin( double %X ) readnone
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br i1 true, label %Loop, label %Out
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Out: ; preds = %Loop
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ret double %A
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; CHECK-LABEL: @test2(
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; CHECK: Out:
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; CHECK-NEXT: call double @sin
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; CHECK-NEXT: ret double %A
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}
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; This testcase checks to make sure the sinker does not cause problems with
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; critical edges.
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define void @test3() {
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Entry:
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br i1 false, label %Loop, label %Exit
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Loop:
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%X = add i32 0, 1
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br i1 false, label %Loop, label %Exit
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Exit:
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%Y = phi i32 [ 0, %Entry ], [ %X, %Loop ]
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ret void
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; CHECK-LABEL: @test3(
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; CHECK: Exit.loopexit:
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; CHECK-NEXT: %X.le = add i32 0, 1
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; CHECK-NEXT: br label %Exit
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}
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; If the result of an instruction is only used outside of the loop, sink
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; the instruction to the exit blocks instead of executing it on every
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; iteration of the loop.
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;
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define i32 @test4(i32 %N) {
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Entry:
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br label %Loop
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Loop: ; preds = %Loop, %Entry
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%N_addr.0.pn = phi i32 [ %dec, %Loop ], [ %N, %Entry ]
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%tmp.6 = mul i32 %N, %N_addr.0.pn ; <i32> [#uses=1]
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%tmp.7 = sub i32 %tmp.6, %N ; <i32> [#uses=1]
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%dec = add i32 %N_addr.0.pn, -1 ; <i32> [#uses=1]
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%tmp.1 = icmp ne i32 %N_addr.0.pn, 1 ; <i1> [#uses=1]
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br i1 %tmp.1, label %Loop, label %Out
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Out: ; preds = %Loop
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ret i32 %tmp.7
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; CHECK-LABEL: @test4(
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; CHECK: Out:
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; CHECK-NEXT: %[[LCSSAPHI:.*]] = phi i32 [ %N_addr.0.pn
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; CHECK-NEXT: mul i32 %N, %[[LCSSAPHI]]
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; CHECK-NEXT: sub i32 %tmp.6.le, %N
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; CHECK-NEXT: ret i32
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}
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; To reduce register pressure, if a load is hoistable out of the loop, and the
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; result of the load is only used outside of the loop, sink the load instead of
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; hoisting it!
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;
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@X = global i32 5 ; <i32*> [#uses=1]
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define i32 @test5(i32 %N) {
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Entry:
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br label %Loop
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Loop: ; preds = %Loop, %Entry
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%N_addr.0.pn = phi i32 [ %dec, %Loop ], [ %N, %Entry ]
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%tmp.6 = load i32* @X ; <i32> [#uses=1]
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%dec = add i32 %N_addr.0.pn, -1 ; <i32> [#uses=1]
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%tmp.1 = icmp ne i32 %N_addr.0.pn, 1 ; <i1> [#uses=1]
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br i1 %tmp.1, label %Loop, label %Out
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Out: ; preds = %Loop
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ret i32 %tmp.6
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; CHECK-LABEL: @test5(
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; CHECK: Out:
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; CHECK-NEXT: %tmp.6.le = load i32* @X
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; CHECK-NEXT: ret i32 %tmp.6.le
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}
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; The loop sinker was running from the bottom of the loop to the top, causing
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; it to miss opportunities to sink instructions that depended on sinking other
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; instructions from the loop. Instead they got hoisted, which is better than
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; leaving them in the loop, but increases register pressure pointlessly.
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%Ty = type { i32, i32 }
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@X2 = external global %Ty
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define i32 @test6() {
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br label %Loop
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Loop:
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%dead = getelementptr %Ty* @X2, i64 0, i32 0
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%sunk2 = load i32* %dead
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br i1 false, label %Loop, label %Out
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Out: ; preds = %Loop
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ret i32 %sunk2
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; CHECK-LABEL: @test6(
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; CHECK: Out:
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; CHECK-NEXT: %dead.le = getelementptr %Ty* @X2, i64 0, i32 0
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; CHECK-NEXT: %sunk2.le = load i32* %dead.le
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; CHECK-NEXT: ret i32 %sunk2.le
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}
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; This testcase ensures that we can sink instructions from loops with
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; multiple exits.
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;
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define i32 @test7(i32 %N, i1 %C) {
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Entry:
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br label %Loop
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Loop: ; preds = %ContLoop, %Entry
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%N_addr.0.pn = phi i32 [ %dec, %ContLoop ], [ %N, %Entry ]
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%tmp.6 = mul i32 %N, %N_addr.0.pn
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%tmp.7 = sub i32 %tmp.6, %N ; <i32> [#uses=2]
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%dec = add i32 %N_addr.0.pn, -1 ; <i32> [#uses=1]
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br i1 %C, label %ContLoop, label %Out1
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ContLoop:
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%tmp.1 = icmp ne i32 %N_addr.0.pn, 1
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br i1 %tmp.1, label %Loop, label %Out2
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Out1: ; preds = %Loop
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ret i32 %tmp.7
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Out2: ; preds = %ContLoop
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ret i32 %tmp.7
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; CHECK-LABEL: @test7(
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; CHECK: Out1:
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; CHECK-NEXT: %[[LCSSAPHI:.*]] = phi i32 [ %N_addr.0.pn
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; CHECK-NEXT: mul i32 %N, %[[LCSSAPHI]]
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; CHECK-NEXT: sub i32 %tmp.6.le, %N
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; CHECK-NEXT: ret
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; CHECK: Out2:
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; CHECK-NEXT: %[[LCSSAPHI:.*]] = phi i32 [ %N_addr.0.pn
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; CHECK-NEXT: mul i32 %N, %[[LCSSAPHI]]
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; CHECK-NEXT: sub i32 %tmp.6.le4, %N
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; CHECK-NEXT: ret
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}
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; This testcase checks to make sure we can sink values which are only live on
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; some exits out of the loop, and that we can do so without breaking dominator
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; info.
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define i32 @test8(i1 %C1, i1 %C2, i32* %P, i32* %Q) {
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Entry:
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br label %Loop
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Loop: ; preds = %Cont, %Entry
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br i1 %C1, label %Cont, label %exit1
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Cont: ; preds = %Loop
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%X = load i32* %P ; <i32> [#uses=2]
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store i32 %X, i32* %Q
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%V = add i32 %X, 1 ; <i32> [#uses=1]
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br i1 %C2, label %Loop, label %exit2
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exit1: ; preds = %Loop
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ret i32 0
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exit2: ; preds = %Cont
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ret i32 %V
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; CHECK-LABEL: @test8(
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; CHECK: exit1:
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; CHECK-NEXT: ret i32 0
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; CHECK: exit2:
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; CHECK-NEXT: %[[LCSSAPHI:.*]] = phi i32 [ %X
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; CHECK-NEXT: %V.le = add i32 %[[LCSSAPHI]], 1
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; CHECK-NEXT: ret i32 %V.le
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}
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define void @test9() {
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loopentry.2.i:
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br i1 false, label %no_exit.1.i.preheader, label %loopentry.3.i.preheader
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no_exit.1.i.preheader: ; preds = %loopentry.2.i
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br label %no_exit.1.i
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no_exit.1.i: ; preds = %endif.8.i, %no_exit.1.i.preheader
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br i1 false, label %return.i, label %endif.8.i
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endif.8.i: ; preds = %no_exit.1.i
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%inc.1.i = add i32 0, 1 ; <i32> [#uses=1]
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br i1 false, label %no_exit.1.i, label %loopentry.3.i.preheader.loopexit
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loopentry.3.i.preheader.loopexit: ; preds = %endif.8.i
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br label %loopentry.3.i.preheader
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loopentry.3.i.preheader: ; preds = %loopentry.3.i.preheader.loopexit, %loopentry.2.i
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%arg_num.0.i.ph13000 = phi i32 [ 0, %loopentry.2.i ], [ %inc.1.i, %loopentry.3.i.preheader.loopexit ] ; <i32> [#uses=0]
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ret void
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return.i: ; preds = %no_exit.1.i
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ret void
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; CHECK-LABEL: @test9(
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; CHECK: loopentry.3.i.preheader.loopexit:
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; CHECK-NEXT: %inc.1.i.le = add i32 0, 1
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; CHECK-NEXT: br label %loopentry.3.i.preheader
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}
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; Potentially trapping instructions may be sunk as long as they are guaranteed
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; to be executed.
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define i32 @test10(i32 %N) {
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Entry:
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br label %Loop
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Loop: ; preds = %Loop, %Entry
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%N_addr.0.pn = phi i32 [ %dec, %Loop ], [ %N, %Entry ] ; <i32> [#uses=3]
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%tmp.6 = sdiv i32 %N, %N_addr.0.pn ; <i32> [#uses=1]
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%dec = add i32 %N_addr.0.pn, -1 ; <i32> [#uses=1]
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%tmp.1 = icmp ne i32 %N_addr.0.pn, 0 ; <i1> [#uses=1]
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br i1 %tmp.1, label %Loop, label %Out
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Out: ; preds = %Loop
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ret i32 %tmp.6
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; CHECK-LABEL: @test10(
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; CHECK: Out:
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; CHECK-NEXT: %[[LCSSAPHI:.*]] = phi i32 [ %N_addr.0.pn
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; CHECK-NEXT: %tmp.6.le = sdiv i32 %N, %[[LCSSAPHI]]
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; CHECK-NEXT: ret i32 %tmp.6.le
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}
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; Should delete, not sink, dead instructions.
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define void @test11() {
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br label %Loop
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Loop:
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%dead = getelementptr %Ty* @X2, i64 0, i32 0
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br i1 false, label %Loop, label %Out
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Out:
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ret void
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; CHECK-LABEL: @test11(
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; CHECK: Out:
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; CHECK-NEXT: ret void
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}
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@c = common global [1 x i32] zeroinitializer, align 4
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; Test a *many* way nested loop with multiple exit blocks both of which exit
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; multiple loop nests. This exercises LCSSA corner cases.
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define i32 @PR18753(i1* %a, i1* %b, i1* %c, i1* %d) {
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entry:
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br label %l1.header
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l1.header:
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%iv = phi i64 [ %iv.next, %l1.latch ], [ 0, %entry ]
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%arrayidx.i = getelementptr inbounds [1 x i32]* @c, i64 0, i64 %iv
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br label %l2.header
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l2.header:
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%x0 = load i1* %c, align 4
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br i1 %x0, label %l1.latch, label %l3.preheader
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l3.preheader:
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br label %l3.header
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l3.header:
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%x1 = load i1* %d, align 4
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br i1 %x1, label %l2.latch, label %l4.preheader
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l4.preheader:
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br label %l4.header
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l4.header:
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%x2 = load i1* %a
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br i1 %x2, label %l3.latch, label %l4.body
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l4.body:
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call void @f(i32* %arrayidx.i)
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%x3 = load i1* %b
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%l = trunc i64 %iv to i32
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br i1 %x3, label %l4.latch, label %exit
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l4.latch:
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call void @g()
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%x4 = load i1* %b, align 4
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br i1 %x4, label %l4.header, label %exit
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l3.latch:
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br label %l3.header
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l2.latch:
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br label %l2.header
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l1.latch:
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%iv.next = add nsw i64 %iv, 1
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br label %l1.header
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exit:
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%lcssa = phi i32 [ %l, %l4.latch ], [ %l, %l4.body ]
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; CHECK-LABEL: @PR18753(
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; CHECK: exit:
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; CHECK-NEXT: %[[LCSSAPHI:.*]] = phi i64 [ %iv, %l4.latch ], [ %iv, %l4.body ]
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; CHECK-NEXT: %l.le = trunc i64 %[[LCSSAPHI]] to i32
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; CHECK-NEXT: ret i32 %l.le
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ret i32 %lcssa
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}
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declare void @f(i32*)
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declare void @g()
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