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46 lines
1.3 KiB
46 lines
1.3 KiB
4 months ago
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; When optimising for minimum size, we don't want to expand a div to a mul
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; and a shift sequence. As a result, the urem instruction e.g. will not be
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; expanded to a sequence of umull, lsrs, muls and sub instructions, but
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; just a call to __aeabi_uidivmod.
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;
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; RUN: llc -mtriple=armv7a-eabi -mattr=-neon -verify-machineinstrs %s -o - | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv7m-arm-none-eabi"
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define i32 @foo1() local_unnamed_addr #0 {
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entry:
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; CHECK-LABEL: foo1:
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; CHECK:__aeabi_idiv
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; CHECK-NOT: smmul
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%call = tail call i32 bitcast (i32 (...)* @GetValue to i32 ()*)()
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%div = sdiv i32 %call, 1000000
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ret i32 %div
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}
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define i32 @foo2() local_unnamed_addr #0 {
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entry:
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; CHECK-LABEL: foo2:
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; CHECK: __aeabi_uidiv
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; CHECK-NOT: umull
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%call = tail call i32 bitcast (i32 (...)* @GetValue to i32 ()*)()
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%div = udiv i32 %call, 1000000
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ret i32 %div
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}
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define i32 @foo3() local_unnamed_addr #0 {
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entry:
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; CHECK-LABEL: foo3:
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; CHECK: __aeabi_uidivmod
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; CHECK-NOT: umull
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%call = tail call i32 bitcast (i32 (...)* @GetValue to i32 ()*)()
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%rem = urem i32 %call, 1000000
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%cmp = icmp eq i32 %rem, 0
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%conv = zext i1 %cmp to i32
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ret i32 %conv
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}
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declare i32 @GetValue(...) local_unnamed_addr
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attributes #0 = { minsize nounwind optsize }
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