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https://github.com/c64scene-ar/llvm-6502.git
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9a2cfffdb6
* Only apply divide bypass optimization when not optimizing for size. * Fixed bug caused by constant for 0 value of type Int32, used dividend type to generate the constant instead. * For atom x86-64 apply the divide bypass to use 16-bit divides instead of 64-bit divides when operand values are small enough. * Added lit tests for 64-bit divide bypass. Patch by Tyler Nowicki! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176442 91177308-0d34-0410-b5e6-96231b3b80d8
47 lines
1.0 KiB
LLVM
47 lines
1.0 KiB
LLVM
; RUN: llc < %s -mcpu=atom -mtriple=i686-linux -march=x86-64 | FileCheck %s
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; Additional tests for 64-bit divide bypass
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define i64 @Test_get_quotient(i64 %a, i64 %b) nounwind {
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; CHECK: Test_get_quotient:
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; CHECK: orq %rsi, %rcx
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; CHECK-NEXT: testq $-65536, %rcx
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; CHECK-NEXT: je
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; CHECK: idivq
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; CHECK: ret
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; CHECK: divw
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; CHECK: ret
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%result = sdiv i64 %a, %b
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ret i64 %result
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}
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define i64 @Test_get_remainder(i64 %a, i64 %b) nounwind {
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; CHECK: Test_get_remainder:
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; CHECK: orq %rsi, %rcx
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; CHECK-NEXT: testq $-65536, %rcx
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; CHECK-NEXT: je
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; CHECK: idivq
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; CHECK: ret
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; CHECK: divw
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; CHECK: ret
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%result = srem i64 %a, %b
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ret i64 %result
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}
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define i64 @Test_get_quotient_and_remainder(i64 %a, i64 %b) nounwind {
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; CHECK: Test_get_quotient_and_remainder:
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; CHECK: orq %rsi, %rcx
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; CHECK-NEXT: testq $-65536, %rcx
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; CHECK-NEXT: je
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; CHECK: idivq
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; CHECK: divw
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; CHECK: addq
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; CHECK: ret
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; CHECK-NOT: idivq
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; CHECK-NOT: divw
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%resultdiv = sdiv i64 %a, %b
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%resultrem = srem i64 %a, %b
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%result = add i64 %resultdiv, %resultrem
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ret i64 %result
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}
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