[llvm] r352673 - [GlobalISel][AArch64] Add instruction selection support for @llvm.log2
Jessica Paquette via llvm-commits
llvm-commits at lists.llvm.org
Wed Jan 30 13:16:04 PST 2019
Author: paquette
Date: Wed Jan 30 13:16:04 2019
New Revision: 352673
URL: http://llvm.org/viewvc/llvm-project?rev=352673&view=rev
Log:
[GlobalISel][AArch64] Add instruction selection support for @llvm.log2
This teaches GlobalISel to emit a RTLib call for @llvm.log2 when it encounters
it.
It updates the existing floating point tests to show that we don't fall back on
the intrinsic, and select the correct instructions. It also adds a legalizer
test for G_FLOG2.
https://reviews.llvm.org/D57357
Added:
llvm/trunk/test/CodeGen/AArch64/GlobalISel/legalize-log2.mir
Modified:
llvm/trunk/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
llvm/trunk/lib/Target/AArch64/AArch64LegalizerInfo.cpp
llvm/trunk/lib/Target/AArch64/AArch64RegisterBankInfo.cpp
llvm/trunk/test/CodeGen/AArch64/GlobalISel/legalizer-info-validation.mir
llvm/trunk/test/CodeGen/AArch64/arm64-vfloatintrinsics.ll
llvm/trunk/test/CodeGen/AArch64/f16-instructions.ll
Modified: llvm/trunk/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/GlobalISel/LegalizerHelper.cpp?rev=352673&r1=352672&r2=352673&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/GlobalISel/LegalizerHelper.cpp (original)
+++ llvm/trunk/lib/CodeGen/GlobalISel/LegalizerHelper.cpp Wed Jan 30 13:16:04 2019
@@ -138,6 +138,10 @@ static RTLIB::Libcall getRTLibDesc(unsig
assert((Size == 32 || Size == 64 || Size == 128) && "Unsupported size");
return Size == 128 ? RTLIB::LOG_F128
: Size == 64 ? RTLIB::LOG_F64 : RTLIB::LOG_F32;
+ case TargetOpcode::G_FLOG2:
+ assert((Size == 32 || Size == 64 || Size == 128) && "Unsupported size");
+ return Size == 128 ? RTLIB::LOG2_F128
+ : Size == 64 ? RTLIB::LOG2_F64 : RTLIB::LOG2_F32;
}
llvm_unreachable("Unknown libcall function");
}
@@ -233,7 +237,8 @@ LegalizerHelper::libcall(MachineInstr &M
case TargetOpcode::G_FCOS:
case TargetOpcode::G_FSIN:
case TargetOpcode::G_FLOG10:
- case TargetOpcode::G_FLOG: {
+ case TargetOpcode::G_FLOG:
+ case TargetOpcode::G_FLOG2: {
if (Size > 64) {
LLVM_DEBUG(dbgs() << "Size " << Size << " too large to legalize.\n");
return UnableToLegalize;
@@ -1197,6 +1202,7 @@ LegalizerHelper::widenScalar(MachineInst
case TargetOpcode::G_FSIN:
case TargetOpcode::G_FLOG10:
case TargetOpcode::G_FLOG:
+ case TargetOpcode::G_FLOG2:
case TargetOpcode::G_FSQRT:
assert(TypeIdx == 0);
Observer.changingInstr(MI);
Modified: llvm/trunk/lib/Target/AArch64/AArch64LegalizerInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64LegalizerInfo.cpp?rev=352673&r1=352672&r2=352673&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64LegalizerInfo.cpp (original)
+++ llvm/trunk/lib/Target/AArch64/AArch64LegalizerInfo.cpp Wed Jan 30 13:16:04 2019
@@ -143,7 +143,7 @@ AArch64LegalizerInfo::AArch64LegalizerIn
[=](const LegalityQuery &Query) { return std::make_pair(0, s32); })
.legalFor({s16, s32, s64, v2s32, v4s32, v2s64, v2s16, v4s16, v8s16});
- getActionDefinitionsBuilder({G_FCOS, G_FSIN, G_FLOG10, G_FLOG})
+ getActionDefinitionsBuilder({G_FCOS, G_FSIN, G_FLOG10, G_FLOG, G_FLOG2})
// We need a call for these, so we always need to scalarize.
.scalarize(0)
// Regardless of FP16 support, widen 16-bit elements to 32-bits.
Modified: llvm/trunk/lib/Target/AArch64/AArch64RegisterBankInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64RegisterBankInfo.cpp?rev=352673&r1=352672&r2=352673&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64RegisterBankInfo.cpp (original)
+++ llvm/trunk/lib/Target/AArch64/AArch64RegisterBankInfo.cpp Wed Jan 30 13:16:04 2019
@@ -397,6 +397,7 @@ static bool isPreISelGenericFloatingPoin
case TargetOpcode::G_FSIN:
case TargetOpcode::G_FLOG10:
case TargetOpcode::G_FLOG:
+ case TargetOpcode::G_FLOG2:
case TargetOpcode::G_FSQRT:
return true;
}
Added: llvm/trunk/test/CodeGen/AArch64/GlobalISel/legalize-log2.mir
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/AArch64/GlobalISel/legalize-log2.mir?rev=352673&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/AArch64/GlobalISel/legalize-log2.mir (added)
+++ llvm/trunk/test/CodeGen/AArch64/GlobalISel/legalize-log2.mir Wed Jan 30 13:16:04 2019
@@ -0,0 +1,227 @@
+# RUN: llc -verify-machineinstrs -mtriple aarch64--- \
+# RUN: -run-pass=legalizer -mattr=+fullfp16 -global-isel %s -o - \
+# RUN: | FileCheck %s
+...
+---
+name: test_v4f16.log2
+alignment: 2
+tracksRegLiveness: true
+registers:
+ - { id: 0, class: _ }
+ - { id: 1, class: _ }
+body: |
+ bb.0:
+ liveins: $d0
+ ; CHECK-LABEL: name: test_v4f16.log2
+ ; CHECK: [[V1:%[0-9]+]]:_(s16), [[V2:%[0-9]+]]:_(s16), [[V3:%[0-9]+]]:_(s16), [[V4:%[0-9]+]]:_(s16) = G_UNMERGE_VALUES %{{[0-9]+}}(<4 x s16>)
+
+ ; CHECK-DAG: [[V1_S32:%[0-9]+]]:_(s32) = G_FPEXT [[V1]](s16)
+ ; CHECK-NEXT: ADJCALLSTACKDOWN
+ ; CHECK-NEXT: $s0 = COPY [[V1_S32]](s32)
+ ; CHECK-NEXT: BL &log2
+ ; CHECK-NEXT: [[ELT1_S32:%[0-9]+]]:_(s32) = COPY $s0
+ ; CHECK-NEXT: ADJCALLSTACKUP
+ ; CHECK-NEXT: [[ELT1:%[0-9]+]]:_(s16) = G_FPTRUNC [[ELT1_S32]](s32)
+
+ ; CHECK-DAG: [[V2_S32:%[0-9]+]]:_(s32) = G_FPEXT [[V2]](s16)
+ ; CHECK-NEXT: ADJCALLSTACKDOWN
+ ; CHECK-NEXT: $s0 = COPY [[V2_S32]](s32)
+ ; CHECK-NEXT: BL &log2
+ ; CHECK-NEXT: [[ELT2_S32:%[0-9]+]]:_(s32) = COPY $s0
+ ; CHECK-NEXT: ADJCALLSTACKUP
+ ; CHECK-NEXT: [[ELT2:%[0-9]+]]:_(s16) = G_FPTRUNC [[ELT2_S32]](s32)
+
+ ; CHECK-DAG: [[V3_S32:%[0-9]+]]:_(s32) = G_FPEXT [[V3]](s16)
+ ; CHECK-NEXT: ADJCALLSTACKDOWN
+ ; CHECK-NEXT: $s0 = COPY [[V3_S32]](s32)
+ ; CHECK-NEXT: BL &log2
+ ; CHECK-NEXT: [[ELT3_S32:%[0-9]+]]:_(s32) = COPY $s0
+ ; CHECK-NEXT: ADJCALLSTACKUP
+ ; CHECK-NEXT: [[ELT3:%[0-9]+]]:_(s16) = G_FPTRUNC [[ELT3_S32]](s32)
+
+ ; CHECK-DAG: [[V4_S32:%[0-9]+]]:_(s32) = G_FPEXT [[V4]](s16)
+ ; CHECK-NEXT: ADJCALLSTACKDOWN
+ ; CHECK-NEXT: $s0 = COPY [[V4_S32]](s32)
+ ; CHECK-NEXT: BL &log2
+ ; CHECK-NEXT: [[ELT4_S32:%[0-9]+]]:_(s32) = COPY $s0
+ ; CHECK-NEXT: ADJCALLSTACKUP
+ ; CHECK-NEXT: [[ELT4:%[0-9]+]]:_(s16) = G_FPTRUNC [[ELT4_S32]](s32)
+
+ ; CHECK-DAG: %{{[0-9]+}}:_(<4 x s16>) = G_BUILD_VECTOR [[ELT1]](s16), [[ELT2]](s16), [[ELT3]](s16), [[ELT4]](s16)
+
+ %0:_(<4 x s16>) = COPY $d0
+ %1:_(<4 x s16>) = G_FLOG2 %0
+ $d0 = COPY %1(<4 x s16>)
+ RET_ReallyLR implicit $d0
+
+...
+---
+name: test_v8f16.log2
+alignment: 2
+tracksRegLiveness: true
+registers:
+ - { id: 0, class: _ }
+ - { id: 1, class: _ }
+body: |
+ bb.0:
+ liveins: $q0
+
+ ; CHECK-LABEL: name: test_v8f16.log2
+
+ ; This is big, so let's just check for the 8 calls to log2, the the
+ ; G_UNMERGE_VALUES, and the G_BUILD_VECTOR. The other instructions ought
+ ; to be covered by the other tests.
+
+ ; CHECK: G_UNMERGE_VALUES
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: G_BUILD_VECTOR
+
+ %0:_(<8 x s16>) = COPY $q0
+ %1:_(<8 x s16>) = G_FLOG2 %0
+ $q0 = COPY %1(<8 x s16>)
+ RET_ReallyLR implicit $q0
+
+...
+---
+name: test_v2f32.log2
+alignment: 2
+tracksRegLiveness: true
+registers:
+ - { id: 0, class: _ }
+ - { id: 1, class: _ }
+body: |
+ bb.0:
+ liveins: $d0
+
+ ; CHECK-LABEL: name: test_v2f32.log2
+ ; CHECK: [[V1:%[0-9]+]]:_(s32), [[V2:%[0-9]+]]:_(s32) = G_UNMERGE_VALUES %{{[0-9]+}}(<2 x s32>)
+
+ ; CHECK-NEXT: ADJCALLSTACKDOWN
+ ; CHECK-DAG: $s0 = COPY [[V1]](s32)
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: [[ELT1:%[0-9]+]]:_(s32) = COPY $s0
+ ; CHECK-DAG: ADJCALLSTACKUP
+
+ ; CHECK-DAG: ADJCALLSTACKDOWN
+ ; CHECK-DAG: $s0 = COPY [[V2]](s32)
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: [[ELT2:%[0-9]+]]:_(s32) = COPY $s0
+ ; CHECK-DAG: ADJCALLSTACKUP
+
+ ; CHECK-DAG: %1:_(<2 x s32>) = G_BUILD_VECTOR [[ELT1]](s32), [[ELT2]](s32)
+
+ %0:_(<2 x s32>) = COPY $d0
+ %1:_(<2 x s32>) = G_FLOG2 %0
+ $d0 = COPY %1(<2 x s32>)
+ RET_ReallyLR implicit $d0
+
+...
+---
+name: test_v4f32.log2
+alignment: 2
+tracksRegLiveness: true
+registers:
+ - { id: 0, class: _ }
+ - { id: 1, class: _ }
+body: |
+ bb.0:
+ liveins: $q0
+ ; CHECK-LABEL: name: test_v4f32.log2
+ ; CHECK: [[V1:%[0-9]+]]:_(s32), [[V2:%[0-9]+]]:_(s32), [[V3:%[0-9]+]]:_(s32), [[V4:%[0-9]+]]:_(s32) = G_UNMERGE_VALUES %{{[0-9]+}}(<4 x s32>)
+
+ ; CHECK-NEXT: ADJCALLSTACKDOWN
+ ; CHECK-DAG: $s0 = COPY [[V1]](s32)
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: [[ELT1:%[0-9]+]]:_(s32) = COPY $s0
+ ; CHECK-DAG: ADJCALLSTACKUP
+
+ ; CHECK-DAG: ADJCALLSTACKDOWN
+ ; CHECK-DAG: $s0 = COPY [[V2]](s32)
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: [[ELT2:%[0-9]+]]:_(s32) = COPY $s0
+ ; CHECK-DAG: ADJCALLSTACKUP
+
+ ; CHECK-DAG: ADJCALLSTACKDOWN
+ ; CHECK-DAG: $s0 = COPY [[V3]](s32)
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: [[ELT3:%[0-9]+]]:_(s32) = COPY $s0
+ ; CHECK-DAG: ADJCALLSTACKUP
+
+ ; CHECK-DAG: ADJCALLSTACKDOWN
+ ; CHECK-DAG: $s0 = COPY [[V4]](s32)
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: [[ELT4:%[0-9]+]]:_(s32) = COPY $s0
+ ; CHECK-DAG: ADJCALLSTACKUP
+
+ ; CHECK-DAG: %1:_(<4 x s32>) = G_BUILD_VECTOR [[ELT1]](s32), [[ELT2]](s32), [[ELT3]](s32), [[ELT4]](s32)
+
+ %0:_(<4 x s32>) = COPY $q0
+ %1:_(<4 x s32>) = G_FLOG2 %0
+ $q0 = COPY %1(<4 x s32>)
+ RET_ReallyLR implicit $q0
+
+...
+---
+name: test_v2f64.log2
+alignment: 2
+tracksRegLiveness: true
+registers:
+ - { id: 0, class: _ }
+ - { id: 1, class: _ }
+body: |
+ bb.0:
+ liveins: $q0
+
+ ; CHECK-LABEL: name: test_v2f64.log2
+ ; CHECK: [[V1:%[0-9]+]]:_(s64), [[V2:%[0-9]+]]:_(s64) = G_UNMERGE_VALUES %{{[0-9]+}}(<2 x s64>)
+
+ ; CHECK-NEXT: ADJCALLSTACKDOWN
+ ; CHECK-DAG: $d0 = COPY [[V1]](s64)
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: [[ELT1:%[0-9]+]]:_(s64) = COPY $d0
+ ; CHECK-DAG: ADJCALLSTACKUP
+
+ ; CHECK-DAG: ADJCALLSTACKDOWN
+ ; CHECK-DAG: $d0 = COPY [[V2]](s64)
+ ; CHECK-DAG: BL &log2
+ ; CHECK-DAG: [[ELT2:%[0-9]+]]:_(s64) = COPY $d0
+ ; CHECK-DAG: ADJCALLSTACKUP
+
+ ; CHECK-DAG: %1:_(<2 x s64>) = G_BUILD_VECTOR [[ELT1]](s64), [[ELT2]](s64)
+
+ %0:_(<2 x s64>) = COPY $q0
+ %1:_(<2 x s64>) = G_FLOG2 %0
+ $q0 = COPY %1(<2 x s64>)
+ RET_ReallyLR implicit $q0
+
+...
+---
+name: test_log2_half
+alignment: 2
+tracksRegLiveness: true
+registers:
+ - { id: 0, class: _ }
+ - { id: 1, class: _ }
+body: |
+ bb.0:
+ liveins: $h0
+ ; CHECK-LABEL: name: test_log2_half
+ ; CHECK: [[REG1:%[0-9]+]]:_(s32) = G_FPEXT %0(s16)
+ ; CHECK-NEXT: ADJCALLSTACKDOWN
+ ; CHECK-NEXT: $s0 = COPY [[REG1]](s32)
+ ; CHECK-NEXT: BL &log2
+ ; CHECK-NEXT: [[REG2:%[0-9]+]]:_(s32) = COPY $s0
+ ; CHECK-NEXT: ADJCALLSTACKUP
+ ; CHECK-NEXT: [[RES:%[0-9]+]]:_(s16) = G_FPTRUNC [[REG2]](s32)
+
+ %0:_(s16) = COPY $h0
+ %1:_(s16) = G_FLOG2 %0
+ $h0 = COPY %1(s16)
+ RET_ReallyLR implicit $h0
Modified: llvm/trunk/test/CodeGen/AArch64/GlobalISel/legalizer-info-validation.mir
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/AArch64/GlobalISel/legalizer-info-validation.mir?rev=352673&r1=352672&r2=352673&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/AArch64/GlobalISel/legalizer-info-validation.mir (original)
+++ llvm/trunk/test/CodeGen/AArch64/GlobalISel/legalizer-info-validation.mir Wed Jan 30 13:16:04 2019
@@ -265,7 +265,7 @@
# DEBUG: .. the first uncovered type index: 1, OK
#
# DEBUG-NEXT: G_FLOG2 (opcode {{[0-9]+}}): 1 type index
-# DEBUG: .. type index coverage check SKIPPED: no rules defined
+# DEBUG: .. the first uncovered type index: 1, OK
#
# DEBUG-NEXT: G_FLOG10 (opcode {{[0-9]+}}): 1 type index
# DEBUG: .. the first uncovered type index: 1, OK
Modified: llvm/trunk/test/CodeGen/AArch64/arm64-vfloatintrinsics.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/AArch64/arm64-vfloatintrinsics.ll?rev=352673&r1=352672&r2=352673&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/AArch64/arm64-vfloatintrinsics.ll (original)
+++ llvm/trunk/test/CodeGen/AArch64/arm64-vfloatintrinsics.ll Wed Jan 30 13:16:04 2019
@@ -101,10 +101,14 @@ define %v4f16 @test_v4f16.log10(%v4f16 %
%1 = call %v4f16 @llvm.log10.v4f16(%v4f16 %a)
ret %v4f16 %1
}
+
+; FALLBACK-NOT: remark{{.*}}test_v4f16.log2
define %v4f16 @test_v4f16.log2(%v4f16 %a) {
; This operation is expanded, whether with or without +fullfp16.
; CHECK-LABEL: test_v4f16.log2:
; CHECK-COUNT-4: bl log2
+ ; GISEL-LABEL: test_v4f16.log2:
+ ; GISEL-COUNT-4: bl log2
%1 = call %v4f16 @llvm.log2.v4f16(%v4f16 %a)
ret %v4f16 %1
}
@@ -286,10 +290,14 @@ define %v8f16 @test_v8f16.log10(%v8f16 %
%1 = call %v8f16 @llvm.log10.v8f16(%v8f16 %a)
ret %v8f16 %1
}
+
+; FALLBACK-NOT: remark{{.*}}test_v8f16.log2
define %v8f16 @test_v8f16.log2(%v8f16 %a) {
; This operation is expanded, whether with or without +fullfp16.
; CHECK-LABEL: test_v8f16.log2:
; CHECK-COUNT-8: bl log2
+ ; GISEL-LABEL: test_v8f16.log2:
+ ; GISEL-COUNT-8: bl log2
%1 = call %v8f16 @llvm.log2.v8f16(%v8f16 %a)
ret %v8f16 %1
}
@@ -454,9 +462,13 @@ define %v2f32 @test_v2f32.log10(%v2f32 %
%1 = call %v2f32 @llvm.log10.v2f32(%v2f32 %a)
ret %v2f32 %1
}
+
+; FALLBACK-NOT: remark{{.*}}test_v2f32.log2
; CHECK: test_v2f32.log2:
+; GISEL: test_v2f32.log2:
define %v2f32 @test_v2f32.log2(%v2f32 %a) {
; CHECK: log
+ ; GISEL: log
%1 = call %v2f32 @llvm.log2.v2f32(%v2f32 %a)
ret %v2f32 %1
}
@@ -597,9 +609,13 @@ define %v4f32 @test_v4f32.log10(%v4f32 %
%1 = call %v4f32 @llvm.log10.v4f32(%v4f32 %a)
ret %v4f32 %1
}
+
+; FALLBACK-NOT: remark{{.*}}test_v4f32.log2
; CHECK: test_v4f32.log2:
+; GISEL: test_v4f32.log2:
define %v4f32 @test_v4f32.log2(%v4f32 %a) {
; CHECK: log
+ ; GISEL: log
%1 = call %v4f32 @llvm.log2.v4f32(%v4f32 %a)
ret %v4f32 %1
}
@@ -740,9 +756,13 @@ define %v2f64 @test_v2f64.log10(%v2f64 %
%1 = call %v2f64 @llvm.log10.v2f64(%v2f64 %a)
ret %v2f64 %1
}
+
+; FALLBACK-NOT: remark{{.*}}test_v2f64.log2
; CHECK: test_v2f64.log2:
+; GISEL: test_v2f64.log2:
define %v2f64 @test_v2f64.log2(%v2f64 %a) {
; CHECK: log
+ ; GISEL: log
%1 = call %v2f64 @llvm.log2.v2f64(%v2f64 %a)
ret %v2f64 %1
}
Modified: llvm/trunk/test/CodeGen/AArch64/f16-instructions.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/AArch64/f16-instructions.ll?rev=352673&r1=352672&r2=352673&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/AArch64/f16-instructions.ll (original)
+++ llvm/trunk/test/CodeGen/AArch64/f16-instructions.ll Wed Jan 30 13:16:04 2019
@@ -964,6 +964,9 @@ define half @test_log10(half %a) #0 {
ret half %r
}
+; FALLBACK-NOT: remark:{{.*}}test_log2
+; FALLBACK-FP16-NOT: remark:{{.*}}test_log2
+
; CHECK-COMMON-LABEL: test_log2:
; CHECK-COMMON-NEXT: stp x29, x30, [sp, #-16]!
; CHECK-COMMON-NEXT: mov x29, sp
@@ -972,6 +975,16 @@ define half @test_log10(half %a) #0 {
; CHECK-COMMON-NEXT: fcvt h0, s0
; CHECK-COMMON-NEXT: ldp x29, x30, [sp], #16
; CHECK-COMMON-NEXT: ret
+
+; GISEL-LABEL: test_log2:
+; GISEL-NEXT: stp x29, x30, [sp, #-16]!
+; GISEL-NEXT: mov x29, sp
+; GISEL-NEXT: fcvt s0, h0
+; GISEL-NEXT: bl {{_?}}log2f
+; GISEL-NEXT: fcvt h0, s0
+; GISEL-NEXT: ldp x29, x30, [sp], #16
+; GISEL-NEXT: ret
+
define half @test_log2(half %a) #0 {
%r = call half @llvm.log2.f16(half %a)
ret half %r
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