mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-12 16:29:31 +00:00
51458ed09e
RAGreedy::tryAssign will now evict interference from the preferred register even when another register is free. To support this, add the EvictionCost struct that counts how many hints are broken by an eviction. We don't want to break one hint just to satisfy another. Rename canEvict to shouldEvict, and add the first bit of eviction policy that doesn't depend on spill weights: Always make room in the preferred register as long as the evictees can be split and aren't already assigned to their preferred register. Also make the CSR avoidance more accurate. When looking for a cheaper register it is OK to use a new volatile register. Only CSR aliases that have never been used before should be avoided. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134735 91177308-0d34-0410-b5e6-96231b3b80d8
74 lines
1.7 KiB
LLVM
74 lines
1.7 KiB
LLVM
; RUN: llc < %s -mtriple=i686-pc-linux-gnu -asm-verbose=0 | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32"
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target triple = "i686-pc-linux-gnu"
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define zeroext i16 @test1(i16 zeroext %x) nounwind {
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entry:
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%div = udiv i16 %x, 33
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ret i16 %div
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; CHECK: test1:
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; CHECK: imull $63551, %eax, %eax
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; CHECK-NEXT: shrl $21, %eax
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; CHECK-NEXT: ret
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}
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define zeroext i16 @test2(i8 signext %x, i16 zeroext %c) nounwind readnone ssp noredzone {
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entry:
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%div = udiv i16 %c, 3
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ret i16 %div
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; CHECK: test2:
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; CHECK: imull $43691, %eax, %eax
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; CHECK-NEXT: shrl $17, %eax
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; CHECK-NEXT: ret
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}
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define zeroext i8 @test3(i8 zeroext %x, i8 zeroext %c) nounwind readnone ssp noredzone {
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entry:
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%div = udiv i8 %c, 3
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ret i8 %div
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; CHECK: test3:
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; CHECK: movzbl 8(%esp), %eax
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; CHECK-NEXT: imull $171, %eax, %eax
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; CHECK-NEXT: shrl $9, %eax
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; CHECK-NEXT: ret
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}
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define signext i16 @test4(i16 signext %x) nounwind {
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entry:
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%div = sdiv i16 %x, 33 ; <i32> [#uses=1]
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ret i16 %div
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; CHECK: test4:
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; CHECK: imull $1986, %eax, %
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}
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define i32 @test5(i32 %A) nounwind {
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%tmp1 = udiv i32 %A, 1577682821 ; <i32> [#uses=1]
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ret i32 %tmp1
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; CHECK: test5:
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; CHECK: movl $365384439, %eax
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; CHECK: mull 4(%esp)
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}
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define signext i16 @test6(i16 signext %x) nounwind {
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entry:
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%div = sdiv i16 %x, 10
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ret i16 %div
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; CHECK: test6:
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; CHECK: imull $26215, %eax, %eax
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; CHECK: shrl $31, %ecx
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; CHECK: sarl $18, %eax
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}
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define i32 @test7(i32 %x) nounwind {
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%div = udiv i32 %x, 28
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ret i32 %div
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; CHECK: test7:
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; CHECK: shrl $2
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; CHECK: movl $613566757
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; CHECK: mull
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; CHECK-NOT: shrl
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; CHECK: ret
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}
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