36 lines
1.1 KiB
LLVM
36 lines
1.1 KiB
LLVM
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; RUN: opt -S -codegenprepare < %s | FileCheck %s
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target datalayout = "e-i64:64-v16:16-v32:32-n16:32:64"
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target triple = "nvptx64-nvidia-cuda"
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; When we bypass slow div with a constant numerator which fits into the bypass
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; width, we still emit the bypass code, but we don't 'or' the numerator with
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; the denominator.
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; CHECK-LABEL: @small_constant_numer
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define i64 @small_constant_numer(i64 %a) {
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; CHECK: [[AND:%[0-9]+]] = and i64 %a, -4294967296
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; CHECK: icmp eq i64 [[AND]], 0
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; CHECK: [[TRUNC:%[0-9]+]] = trunc i64 %a to i32
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; CHECK: udiv i32 -1, [[TRUNC]]
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%d = sdiv i64 4294967295, %a ; 0xffff'ffff
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ret i64 %d
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}
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; When we try to bypass slow div with a constant numerator which *doesn't* fit
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; into the bypass width, leave it as a plain 64-bit div with no bypass.
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; CHECK-LABEL: @large_constant_numer
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define i64 @large_constant_numer(i64 %a) {
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; CHECK-NOT: udiv i32
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%d = sdiv i64 4294967296, %a ; 0x1'0000'0000
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ret i64 %d
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}
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; For good measure, try a value larger than 2^32.
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; CHECK-LABEL: @larger_constant_numer
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define i64 @larger_constant_numer(i64 %a) {
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; CHECK-NOT: udiv i32
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%d = sdiv i64 5000000000, %a
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ret i64 %d
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}
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