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https://github.com/c64scene-ar/llvm-6502.git
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6ff59a16a0
of loops. Previously, two consecutive calls to function "func" would result in the following sequence of instructions: 1. load $16, %got(func)($gp) // load address of lazy-binding stub. 2. move $25, $16 3. jalr $25 // jump to lazy-binding stub. 4. nop 5. move $25, $16 6. jalr $25 // jump to lazy-binding stub again. With this patch, the second call directly jumps to func's address, bypassing the lazy-binding resolution routine: 1. load $25, %got(func)($gp) // load address of lazy-binding stub. 2. jalr $25 // jump to lazy-binding stub. 3. nop 4. load $25, %got(func)($gp) // load resolved address of func. 5. jalr $25 // directly jump to func. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191591 91177308-0d34-0410-b5e6-96231b3b80d8
42 lines
1022 B
LLVM
42 lines
1022 B
LLVM
; RUN: llc -march=mipsel < %s | FileCheck %s
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; CHECK-LABEL: foo6:
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; CHECK: %while.body
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; CHECK: lw $25, %call16(foo2)(${{[0-9]+}})
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; CHECK: jalr $25
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; CHECK: %while.end
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define void @foo6(i32 %n) {
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entry:
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%tobool1 = icmp eq i32 %n, 0
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br i1 %tobool1, label %while.end, label %while.body
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while.body: ; preds = %entry, %while.body
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%n.addr.02 = phi i32 [ %dec, %while.body ], [ %n, %entry ]
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%dec = add nsw i32 %n.addr.02, -1
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tail call void @foo2()
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%tobool = icmp eq i32 %dec, 0
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br i1 %tobool, label %while.end, label %while.body
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while.end: ; preds = %while.body, %entry
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ret void
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}
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declare void @foo2()
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; CHECK-LABEL: foo1:
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; CHECK: lw $25, %call16(foo2)(${{[0-9]+}})
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; CHECK: jalr $25
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; CHECK: lw $25, %call16(foo2)(${{[0-9]+}})
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; CHECK: jalr $25
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; CHECK: lw $25, %call16(foo2)(${{[0-9]+}})
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; CHECK: jalr $25
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define void @foo1() {
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entry:
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tail call void @foo2()
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tail call void @foo2()
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tail call void @foo2()
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ret void
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}
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