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https://github.com/c64scene-ar/llvm-6502.git
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9b108a338d
This happens all the time when a smul is promoted to a larger type.
On x86-64 we now compile "int test(int x) { return x/10; }" into
movslq %edi, %rax
imulq $1717986919, %rax, %rax
movq %rax, %rcx
shrq $63, %rcx
sarq $34, %rax <- used to be "shrq $32, %rax; sarl $2, %eax"
addl %ecx, %eax
This fires 96 times in gcc.c on x86-64.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124559 91177308-0d34-0410-b5e6-96231b3b80d8
63 lines
1.5 KiB
LLVM
63 lines
1.5 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 $-1985, %ecx, %ecx
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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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