forked from OSchip/llvm-project
56 lines
1.4 KiB
LLVM
56 lines
1.4 KiB
LLVM
; Check that a division is bypassed when appropriate only.
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; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mcpu=atom < %s | FileCheck -check-prefixes=ATOM,CHECK %s
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; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mcpu=silvermont < %s | FileCheck -check-prefixes=REST,CHECK %s
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; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mcpu=skylake < %s | FileCheck -check-prefixes=REST,CHECK %s
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; Verify that div32 is bypassed only for Atoms.
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define i32 @div32(i32 %a, i32 %b) {
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entry:
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; ATOM-LABEL: div32:
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; ATOM: orl %{{.*}}, [[REG:%[a-z]+]]
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; ATOM: testl $-256, [[REG]]
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; ATOM: divb
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;
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; REST-LABEL: div32:
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; REST-NOT: divb
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;
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%div = sdiv i32 %a, %b
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ret i32 %div
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}
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; Verify that div64 is always bypassed.
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define i64 @div64(i64 %a, i64 %b) {
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entry:
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; CHECK-LABEL: div64:
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; CHECK: orq %{{.*}}, [[REG:%[a-z]+]]
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; CHECK: shrq $32, [[REG]]
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; CHECK: divl
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;
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%div = sdiv i64 %a, %b
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ret i64 %div
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}
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; Verify that no extra code is generated when optimizing for size.
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define i64 @div64_optsize(i64 %a, i64 %b) optsize {
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; CHECK-LABEL: div64_optsize:
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; CHECK-NOT: divl
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%div = sdiv i64 %a, %b
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ret i64 %div
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}
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define i32 @div32_optsize(i32 %a, i32 %b) optsize {
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; CHECK-LABEL: div32_optsize:
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; CHECK-NOT: divb
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%div = sdiv i32 %a, %b
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ret i32 %div
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}
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define i32 @div32_minsize(i32 %a, i32 %b) minsize {
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; CHECK-LABEL: div32_minsize:
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; CHECK-NOT: divb
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%div = sdiv i32 %a, %b
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ret i32 %div
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}
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