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4b2ab7e75e
In r292621, the recommit fixes a bug related with live interval update after the partial redundent copy is moved. This recommit solves an additional bug related to the lack of update of subranges. The original patch is to solve the performance problem described in PR27827. Register coalescing sometimes cannot remove a copy because of interference. But if we can find a reverse copy in one of the predecessor block of the copy, the copy is partially redundent and we may remove the copy partially by moving it to the predecessor block without the reverse copy. Differential Revision: https://reviews.llvm.org/D28585 Re-apply r292621 Revert "Revert rL292621. Caused some internal build bot failures in apple." This reverts commit r292984. Original patch: Wei Mi <wmi@google.com> Subrange fix: Mostly Matthias Braun <matze@braunis.de> llvm-svn: 293353
52 lines
1.7 KiB
LLVM
52 lines
1.7 KiB
LLVM
; RUN: llc -regalloc=greedy -mtriple=x86_64-unknown-linux-gnu < %s -o - | FileCheck %s
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;
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; The test is to check no redundent mov as follows will be generated in %while.body loop.
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; .LBB0_2:
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; movsbl %cl, %ecx
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; movl %edx, %eax ==> This movl can be promoted outside of loop.
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; shll $5, %eax
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; ...
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; movl %eax, %edx
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; jne .LBB0_2
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;
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; CHECK-LABEL: foo:
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; CHECK: [[L0:.LBB0_[0-9]+]]: # %while.body
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; CHECK: movl %[[REGA:.*]], %[[REGB:.*]]
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; CHECK-NOT: movl %[[REGB]], %[[REGA]]
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; CHECK: jne [[L0]]
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;
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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@b = common local_unnamed_addr global i8* null, align 8
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@a = common local_unnamed_addr global i32 0, align 4
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define i32 @foo() local_unnamed_addr {
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entry:
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%t0 = load i8*, i8** @b, align 8
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%t1 = load i8, i8* %t0, align 1
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%cmp4 = icmp eq i8 %t1, 0
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%t2 = load i32, i32* @a, align 4
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br i1 %cmp4, label %while.end, label %while.body.preheader
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while.body.preheader: ; preds = %entry
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br label %while.body
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while.body: ; preds = %while.body.preheader, %while.body
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%t3 = phi i32 [ %add3, %while.body ], [ %t2, %while.body.preheader ]
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%t4 = phi i8 [ %t5, %while.body ], [ %t1, %while.body.preheader ]
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%conv = sext i8 %t4 to i32
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%add = mul i32 %t3, 33
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%add3 = add nsw i32 %add, %conv
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store i32 %add3, i32* @a, align 4
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%t5 = load i8, i8* %t0, align 1
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%cmp = icmp eq i8 %t5, 0
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br i1 %cmp, label %while.end.loopexit, label %while.body
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while.end.loopexit: ; preds = %while.body
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br label %while.end
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while.end: ; preds = %while.end.loopexit, %entry
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%.lcssa = phi i32 [ %t2, %entry ], [ %add3, %while.end.loopexit ]
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ret i32 %.lcssa
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}
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