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[InstCombine] Optimize (select %x, op(%x), 0) to op(%x) for operations where op(0) == 0 #147605
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7127450
Add tests for cases with (select %x, op(%x), 0) for operations where …
5879158
[InstCombine] Optimize (select %x, op(%x), 0) to op(%x) for operation…
9f9b586
Reorder so that matching occurs before any data extraction
bababuck 699b878
Use m_c_Intrinsic<Intrinisic::umin> instead of m_c_UMin
bababuck fa12f6a
Don't match with `shl`, `ashr`, and `ashl` because if the `shfamt` is…
bababuck 280256e
Don't match with `udiv` and `sdiv` because if the denominator is 0 we…
bababuck 247574e
Add back in SDiv/UDiv/URem/SRem, but don't freeze them
bababuck b552fd6
Match to m_I[Div/Rem] rather than the individual signed and unsigned …
bababuck c659727
Add tests for commuted versions of AND and MUL
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,221 @@ | ||
| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py | ||
| ; RUN: opt -S -passes=instcombine < %s | FileCheck %s | ||
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| ; (select (icmp x, 0, eq), 0, (umin x, y)) -> (umin x, y) | ||
| define i64 @umin_select(i64 %a, i64 %b) { | ||
| ; CHECK-LABEL: @umin_select( | ||
| ; CHECK-NEXT: [[B_FR:%.*]] = freeze i64 [[B:%.*]] | ||
| ; CHECK-NEXT: [[UMIN:%.*]] = call i64 @llvm.umin.i64(i64 [[A:%.*]], i64 [[B_FR]]) | ||
| ; CHECK-NEXT: ret i64 [[UMIN]] | ||
| ; | ||
| %cond = icmp eq i64 %a, 0 | ||
| %umin = call i64 @llvm.umin.i64(i64 %a, i64 %b) | ||
| %select = select i1 %cond, i64 0, i64 %umin | ||
| ret i64 %select | ||
| } | ||
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| ; (select (icmp x, 0, eq), 0, (mul x, y)) -> (mul x, y) | ||
| define i64 @mul_select(i64 %a, i64 %b) { | ||
| ; CHECK-LABEL: @mul_select( | ||
| ; CHECK-NEXT: [[B_FR:%.*]] = freeze i64 [[B:%.*]] | ||
| ; CHECK-NEXT: [[MUL:%.*]] = mul i64 [[A:%.*]], [[B_FR]] | ||
| ; CHECK-NEXT: ret i64 [[MUL]] | ||
| ; | ||
| %cond = icmp eq i64 %a, 0 | ||
| %mul = mul i64 %a, %b | ||
| %select = select i1 %cond, i64 0, i64 %mul | ||
| ret i64 %select | ||
| } | ||
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| ; (select (icmp x, 0, eq), 0, (mul x, y)) -> (mul x, y) | ||
| define i64 @mul_select_comm(i64 %a, i64 %b) { | ||
| ; CHECK-LABEL: @mul_select_comm( | ||
| ; CHECK-NEXT: [[B_FR:%.*]] = freeze i64 [[B:%.*]] | ||
| ; CHECK-NEXT: [[MUL:%.*]] = mul i64 [[B_FR]], [[A:%.*]] | ||
| ; CHECK-NEXT: ret i64 [[MUL]] | ||
| ; | ||
| %cond = icmp eq i64 %a, 0 | ||
| %mul = mul i64 %b, %a | ||
| %select = select i1 %cond, i64 0, i64 %mul | ||
| ret i64 %select | ||
| } | ||
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| ; (select (icmp x, 0, eq), 0, (shl x, y)) -> (shl x, y) | ||
| define i64 @shl_select(i64 %a, i64 %b) { | ||
| ; CHECK-LABEL: @shl_select( | ||
| ; CHECK-NEXT: [[COND:%.*]] = icmp eq i64 [[A:%.*]], 0 | ||
| ; CHECK-NEXT: [[SHL:%.*]] = shl i64 [[A]], [[B_FR:%.*]] | ||
| ; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[COND]], i64 0, i64 [[SHL]] | ||
| ; CHECK-NEXT: ret i64 [[SELECT]] | ||
| ; | ||
| %cond = icmp eq i64 %a, 0 | ||
| %shl = shl i64 %a, %b | ||
| %select = select i1 %cond, i64 0, i64 %shl | ||
| ret i64 %select | ||
| } | ||
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| ; (select (icmp x, 0, eq), 0, (and x, y)) -> (and x, y) | ||
| define i64 @and_select(i64 %a, i64 %b) { | ||
| ; CHECK-LABEL: @and_select( | ||
| ; CHECK-NEXT: [[B_FR:%.*]] = freeze i64 [[B:%.*]] | ||
| ; CHECK-NEXT: [[AND:%.*]] = and i64 [[A:%.*]], [[B_FR]] | ||
| ; CHECK-NEXT: ret i64 [[AND]] | ||
| ; | ||
| %cond = icmp eq i64 %a, 0 | ||
| %and = and i64 %a, %b | ||
| %select = select i1 %cond, i64 0, i64 %and | ||
| ret i64 %select | ||
| } | ||
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| ; (select (icmp x, 0, eq), 0, (and x, y)) -> (and x, y) | ||
| define i64 @and_select_comm(i64 %a, i64 %b) { | ||
| ; CHECK-LABEL: @and_select_comm( | ||
| ; CHECK-NEXT: [[B_FR:%.*]] = freeze i64 [[B:%.*]] | ||
| ; CHECK-NEXT: [[AND:%.*]] = and i64 [[B_FR]], [[A:%.*]] | ||
| ; CHECK-NEXT: ret i64 [[AND]] | ||
| ; | ||
| %cond = icmp eq i64 %a, 0 | ||
| %and = and i64 %b, %a | ||
| %select = select i1 %cond, i64 0, i64 %and | ||
| ret i64 %select | ||
| } | ||
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| ; (select (icmp x, 0, ne), (ashr x, y), 0) -> (ashr x, y) | ||
| define i64 @ashr_select(i64 %a, i64 %b) { | ||
| ; CHECK-LABEL: @ashr_select( | ||
| ; CHECK-NEXT: [[COND_NOT:%.*]] = icmp eq i64 [[A:%.*]], 0 | ||
| ; CHECK-NEXT: [[ASHR:%.*]] = ashr i64 [[A]], [[B_FR:%.*]] | ||
| ; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[COND_NOT]], i64 0, i64 [[ASHR]] | ||
| ; CHECK-NEXT: ret i64 [[SELECT]] | ||
| ; | ||
| %cond = icmp ne i64 0, %a | ||
| %ashr = ashr i64 %a, %b | ||
| %select = select i1 %cond, i64 %ashr, i64 0 | ||
| ret i64 %select | ||
| } | ||
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| ; (select (icmp x, 0, ne), (lshr x, y), 0) -> (lshr x, y) | ||
| define i64 @lshr_select(i64 %a, i64 %b) { | ||
| ; CHECK-LABEL: @lshr_select( | ||
| ; CHECK-NEXT: [[COND_NOT:%.*]] = icmp eq i64 [[A:%.*]], 0 | ||
| ; CHECK-NEXT: [[LSHR:%.*]] = lshr i64 [[A]], [[B_FR:%.*]] | ||
| ; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[COND_NOT]], i64 0, i64 [[LSHR]] | ||
| ; CHECK-NEXT: ret i64 [[SELECT]] | ||
| ; | ||
| %cond = icmp ne i64 0, %a | ||
| %lshr = lshr i64 %a, %b | ||
| %select = select i1 %cond, i64 %lshr, i64 0 | ||
| ret i64 %select | ||
| } | ||
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| ; (select (icmp x, 0, eq), 0, fshr(x, x, y)) -> fshr(x, x, y) | ||
| define i64 @fshr_select(i64 %a, i64 %b) { | ||
| ; CHECK-LABEL: @fshr_select( | ||
| ; CHECK-NEXT: [[B_FR:%.*]] = freeze i64 [[B:%.*]] | ||
| ; CHECK-NEXT: [[FSHR:%.*]] = call i64 @llvm.fshr.i64(i64 [[A:%.*]], i64 [[A]], i64 [[B_FR]]) | ||
| ; CHECK-NEXT: ret i64 [[FSHR]] | ||
| ; | ||
| %cond = icmp eq i64 %a, 0 | ||
| %fshr = call i64 @llvm.fshr.i64(i64 %a, i64 %a, i64 %b) | ||
| %select = select i1 %cond, i64 0, i64 %fshr | ||
| ret i64 %select | ||
| } | ||
|
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| ; (select (icmp x, 0, eq), 0, (fshl x, x, y)) -> (fshl x, x, y) | ||
| define i64 @fshl_select(i64 %a, i64 %b) { | ||
| ; CHECK-LABEL: @fshl_select( | ||
| ; CHECK-NEXT: [[B_FR:%.*]] = freeze i64 [[B:%.*]] | ||
| ; CHECK-NEXT: [[FSHL:%.*]] = call i64 @llvm.fshl.i64(i64 [[A:%.*]], i64 [[A]], i64 [[B_FR]]) | ||
| ; CHECK-NEXT: ret i64 [[FSHL]] | ||
| ; | ||
| %cond = icmp eq i64 %a, 0 | ||
| %fshl = call i64 @llvm.fshl.i64(i64 %a, i64 %a, i64 %b) | ||
| %select = select i1 %cond, i64 0, i64 %fshl | ||
| ret i64 %select | ||
| } | ||
|
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| ; (select (icmp x, 0, eq), 0, (fshr x, z, y)) -> leave as is | ||
| define i64 @fshr_select_no_combine(i64 %a, i64 %b, i64 %c) { | ||
| ; CHECK-LABEL: @fshr_select_no_combine( | ||
| ; CHECK-NEXT: [[COND:%.*]] = icmp eq i64 [[A:%.*]], 0 | ||
| ; CHECK-NEXT: [[FSHR:%.*]] = call i64 @llvm.fshr.i64(i64 [[A]], i64 [[B:%.*]], i64 [[C:%.*]]) | ||
| ; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[COND]], i64 0, i64 [[FSHR]] | ||
| ; CHECK-NEXT: ret i64 [[SELECT]] | ||
| ; | ||
| %cond = icmp eq i64 %a, 0 | ||
| %fshr = call i64 @llvm.fshr.i64(i64 %a, i64 %b, i64 %c) | ||
| %select = select i1 %cond, i64 0, i64 %fshr | ||
| ret i64 %select | ||
| } | ||
|
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||
| ; (select (icmp x, 0, eq), 0, (sdiv x, y)) -> (sdiv x, y) | ||
| define i64 @sdiv_select(i64 %a, i64 %b) { | ||
| ; CHECK-LABEL: @sdiv_select( | ||
| ; CHECK-NEXT: [[DIV:%.*]] = sdiv i64 [[A:%.*]], [[B_FR:%.*]] | ||
| ; CHECK-NEXT: ret i64 [[DIV]] | ||
| ; | ||
| %cond = icmp eq i64 %a, 0 | ||
| %div = sdiv i64 %a, %b | ||
| %select = select i1 %cond, i64 0, i64 %div | ||
| ret i64 %select | ||
| } | ||
|
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||
| ; (select (icmp x, 0, eq), 0, (udiv x, y)) -> (udiv x, y) | ||
| define i64 @udiv_select(i64 %a, i64 %b) { | ||
| ; CHECK-LABEL: @udiv_select( | ||
| ; CHECK-NEXT: [[DIV:%.*]] = udiv i64 [[A:%.*]], [[B_FR:%.*]] | ||
| ; CHECK-NEXT: ret i64 [[DIV]] | ||
| ; | ||
| %cond = icmp eq i64 %a, 0 | ||
| %div = udiv i64 %a, %b | ||
| %select = select i1 %cond, i64 0, i64 %div | ||
| ret i64 %select | ||
| } | ||
|
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||
| ; (select (icmp x, 0, eq), 0, (srem x, y)) -> (srem x, y) | ||
| define i64 @srem_select(i64 %a, i64 %b) { | ||
| ; CHECK-LABEL: @srem_select( | ||
| ; CHECK-NEXT: [[REM:%.*]] = srem i64 [[A:%.*]], [[B:%.*]] | ||
| ; CHECK-NEXT: ret i64 [[REM]] | ||
| ; | ||
| %cond = icmp eq i64 %a, 0 | ||
| %rem = srem i64 %a, %b | ||
| %select = select i1 %cond, i64 0, i64 %rem | ||
| ret i64 %select | ||
| } | ||
|
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||
| ; (select (icmp x, 0, eq), 0, (urem x, y)) -> (urem x, y) | ||
| define i64 @urem_select(i64 %a, i64 %b) { | ||
| ; CHECK-LABEL: @urem_select( | ||
| ; CHECK-NEXT: [[REM:%.*]] = urem i64 [[A:%.*]], [[B:%.*]] | ||
| ; CHECK-NEXT: ret i64 [[REM]] | ||
| ; | ||
| %cond = icmp eq i64 %a, 0 | ||
| %rem = urem i64 %a, %b | ||
| %select = select i1 %cond, i64 0, i64 %rem | ||
| ret i64 %select | ||
| } | ||
|
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||
| ; (select (icmp x, 0, eq), 0, (icmp x, 0, slt)) -> (icmp x, 0, slt) | ||
| define i1 @icmp_slt_select(i64 %a) { | ||
| ; CHECK-LABEL: @icmp_slt_select( | ||
| ; CHECK-NEXT: [[ICMP:%.*]] = icmp slt i64 [[A:%.*]], 0 | ||
| ; CHECK-NEXT: ret i1 [[ICMP]] | ||
| ; | ||
| %cond = icmp eq i64 %a, 0 | ||
| %icmp = icmp slt i64 %a, 0 | ||
| %select = select i1 %cond, i1 0, i1 %icmp | ||
| ret i1 %select | ||
| } | ||
|
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| ; (select (icmp x, 0, eq), 0, (sub 0, x)) -> (sub 0, x) | ||
| define i64 @sub_select(i64 %a) { | ||
| ; CHECK-LABEL: @sub_select( | ||
| ; CHECK-NEXT: [[SUB:%.*]] = sub i64 0, [[A:%.*]] | ||
| ; CHECK-NEXT: ret i64 [[SUB]] | ||
| ; | ||
| %cond = icmp eq i64 %a, 0 | ||
| %sub = sub i64 0, %a | ||
| %select = select i1 %cond, i64 0, i64 %sub | ||
| ret i64 %select | ||
| } | ||
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