arti
cfe751ccab
Scripts/tms-clang runs the generic opt pipeline without a target machine, so the target cannot veto IndVarSimplify's exit-value replacement through TTI. That rewrite turns sumto's closed form into an i33 multiply, which llc cannot select. Disable only that rewrite with -replexitval=never and document why.
68 lines
2.1 KiB
Bash
Executable File
68 lines
2.1 KiB
Bash
Executable File
#!/bin/sh
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# tms-clang -- M1 IR pipeline: clang IR, scale GEPs, optimize, normalize GEPs.
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#
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# Usage: tms-clang [-O0|-O2] [-I dir] -o OUT.ll IN.c
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#
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# -O2 (the default) scales, optimizes, then normalizes; -O0 skips the optimizer.
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# The output is normalized IR for llc -march=tms34010; this wrapper does not
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# invoke llc itself.
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set -eu
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ROOT=$(cd "$(dirname "$0")/.." && pwd)
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TMS_CLANG=${TMS_CLANG:-$ROOT/build/llvm-build/bin/clang}
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TMS_OPT=${TMS_OPT:-$ROOT/build/llvm-build/bin/opt}
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TMS_BITADDR=${TMS_BITADDR:-$ROOT/tools/tms-bitaddr/tms-bitaddr}
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OPTIMIZE=1
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INCLUDES=
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OUT=
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IN=
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usage() {
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echo "usage: $0 [-O0|-O2] [-I dir] -o OUT.ll IN.c" >&2
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exit 2
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}
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while [ $# -gt 0 ]; do
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case "$1" in
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-O0) OPTIMIZE=0; shift ;;
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-O2) OPTIMIZE=1; shift ;;
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-I) [ $# -ge 2 ] || usage; INCLUDES="$INCLUDES -I $2"; shift 2 ;;
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-I*) INCLUDES="$INCLUDES $1"; shift ;;
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-o) [ $# -ge 2 ] || usage; OUT=$2; shift 2 ;;
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-*) usage ;;
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*) [ -z "$IN" ] || usage; IN=$1; shift ;;
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esac
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done
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[ -n "$IN" ] || usage
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[ -n "$OUT" ] || usage
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TMP=$(mktemp -d "${TMPDIR:-/tmp}/tms-clang.XXXXXX")
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trap 'rm -rf "$TMP"' EXIT HUP INT TERM
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# shellcheck disable=SC2086
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"$TMS_CLANG" --target=tms34010-unknown-none -O0 -Xclang -disable-O0-optnone \
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-S -emit-llvm -ffreestanding -fno-builtin -nostdinc $INCLUDES \
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-o "$TMP/step1.ll" "$IN"
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"$TMS_BITADDR" --scale "$TMP/step1.ll" "$TMP/scaled.ll" 2>/dev/null
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if [ "$OPTIMIZE" -eq 1 ]; then
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# This target has no i64 and no multiply-high, so IndVarSimplify's
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# exit-value replacement (which rewrites a loop's final value into a
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# closed-form i33 multiply, e.g. n*(n+1)/2 for sumto) produces IR that
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# llc cannot select. -replexitval is an option of IndVarSimplify; disabling
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# only that rewrite keeps the loop, which is what ordinary -O2 code needs.
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# This is a driver policy, not a target TTI policy: opt runs without a
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# target machine here.
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"$TMS_OPT" -passes='default<O2>' -replexitval=never -S "$TMP/scaled.ll" \
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-o "$TMP/opt.ll"
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NORMALIZE_IN="$TMP/opt.ll"
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else
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NORMALIZE_IN="$TMP/scaled.ll"
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fi
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mkdir -p "$(dirname "$OUT")"
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"$TMS_BITADDR" --normalize "$NORMALIZE_IN" "$OUT" 2>/dev/null
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