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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
37 lines
1.2 KiB
LLVM
37 lines
1.2 KiB
LLVM
; RUN: llc -march=mipsel < %s | FileCheck %s -check-prefix=32
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; RUN: llc -march=mips64el -mcpu=mips64 -mattr=n64 < %s | \
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; RUN: FileCheck %s -check-prefix=64
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%struct.S1 = type { [65536 x i8] }
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@s1 = external global %struct.S1
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define void @f() nounwind {
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entry:
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; 32: lui $[[R0:[0-9]+]], 65535
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; 32: addiu $[[R0]], $[[R0]], -24
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; 32: addu $sp, $sp, $[[R0]]
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; 32: lui $[[R1:[0-9]+]], 1
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; 32: addu $[[R1]], $sp, $[[R1]]
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; 32: sw $ra, 20($[[R1]])
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; 64: daddiu $[[R0:[0-9]+]], $zero, 1
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; 64: dsll $[[R0]], $[[R0]], 48
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; 64: daddiu $[[R0]], $[[R0]], -1
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; 64: dsll $[[R0]], $[[R0]], 16
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; 64: daddiu $[[R0]], $[[R0]], -32
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; 64: daddu $sp, $sp, $[[R0]]
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; 64: lui $[[R1:[0-9]+]], 1
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; 64: daddu $[[R1]], $sp, $[[R1]]
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; 64: sd $ra, 24($[[R1]])
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%agg.tmp = alloca %struct.S1, align 1
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%tmp = getelementptr inbounds %struct.S1* %agg.tmp, i32 0, i32 0, i32 0
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %tmp, i8* getelementptr inbounds (%struct.S1* @s1, i32 0, i32 0, i32 0), i32 65536, i32 1, i1 false)
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call void @f2(%struct.S1* byval %agg.tmp) nounwind
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ret void
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}
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declare void @f2(%struct.S1* byval)
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declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
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