From 8d745875c28528a30155bfa0ca992e2202d08b96 Mon Sep 17 00:00:00 2001 From: Stefan Brankovic Date: Fri, 4 Oct 2019 15:43:59 +0200 Subject: [PATCH] target/ppc: Fix for optimized vsl/vsr instructions In previous implementation, invocation of TCG shift function could request shift of TCG variable by 64 bits when variable 'sh' is 0, which is not supported in TCG (values can be shifted by 0 to 63 bits). This patch fixes this by using two separate invocation of TCG shift functions, with maximum shift amount of 32. Name of variable 'shifted' is changed to 'carry' so variable naming is similar to old helper implementation. Variables 'avrA' and 'avrB' are replaced with variable 'avr'. Fixes: 4e6d0920e7547e6af4bbac5ffe9adfe6ea621822 Reported-by: "Paul A. Clark" Reported-by: Mark Cave-Ayland Suggested-by: Aleksandar Markovic Signed-off-by: Stefan Brankovic Message-Id: <1570196639-7025-2-git-send-email-stefan.brankovic@rt-rk.com> Tested-by: Paul A. Clarke Signed-off-by: David Gibson --- target/ppc/translate/vmx-impl.inc.c | 84 ++++++++++++++--------------- 1 file changed, 40 insertions(+), 44 deletions(-) diff --git a/target/ppc/translate/vmx-impl.inc.c b/target/ppc/translate/vmx-impl.inc.c index 2472a5217a..81d5a7a341 100644 --- a/target/ppc/translate/vmx-impl.inc.c +++ b/target/ppc/translate/vmx-impl.inc.c @@ -590,40 +590,38 @@ static void trans_vsl(DisasContext *ctx) int VT = rD(ctx->opcode); int VA = rA(ctx->opcode); int VB = rB(ctx->opcode); - TCGv_i64 avrA = tcg_temp_new_i64(); - TCGv_i64 avrB = tcg_temp_new_i64(); + TCGv_i64 avr = tcg_temp_new_i64(); TCGv_i64 sh = tcg_temp_new_i64(); - TCGv_i64 shifted = tcg_temp_new_i64(); + TCGv_i64 carry = tcg_temp_new_i64(); TCGv_i64 tmp = tcg_temp_new_i64(); - /* Place bits 125-127 of vB in sh. */ - get_avr64(avrB, VB, false); - tcg_gen_andi_i64(sh, avrB, 0x07ULL); + /* Place bits 125-127 of vB in 'sh'. */ + get_avr64(avr, VB, false); + tcg_gen_andi_i64(sh, avr, 0x07ULL); /* - * Save highest sh bits of lower doubleword element of vA in variable - * shifted and perform shift on lower doubleword. + * Save highest 'sh' bits of lower doubleword element of vA in variable + * 'carry' and perform shift on lower doubleword. */ - get_avr64(avrA, VA, false); - tcg_gen_subfi_i64(tmp, 64, sh); - tcg_gen_shr_i64(shifted, avrA, tmp); - tcg_gen_andi_i64(shifted, shifted, 0x7fULL); - tcg_gen_shl_i64(avrA, avrA, sh); - set_avr64(VT, avrA, false); + get_avr64(avr, VA, false); + tcg_gen_subfi_i64(tmp, 32, sh); + tcg_gen_shri_i64(carry, avr, 32); + tcg_gen_shr_i64(carry, carry, tmp); + tcg_gen_shl_i64(avr, avr, sh); + set_avr64(VT, avr, false); /* * Perform shift on higher doubleword element of vA and replace lowest - * sh bits with shifted. + * 'sh' bits with 'carry'. */ - get_avr64(avrA, VA, true); - tcg_gen_shl_i64(avrA, avrA, sh); - tcg_gen_or_i64(avrA, avrA, shifted); - set_avr64(VT, avrA, true); + get_avr64(avr, VA, true); + tcg_gen_shl_i64(avr, avr, sh); + tcg_gen_or_i64(avr, avr, carry); + set_avr64(VT, avr, true); - tcg_temp_free_i64(avrA); - tcg_temp_free_i64(avrB); + tcg_temp_free_i64(avr); tcg_temp_free_i64(sh); - tcg_temp_free_i64(shifted); + tcg_temp_free_i64(carry); tcg_temp_free_i64(tmp); } @@ -639,39 +637,37 @@ static void trans_vsr(DisasContext *ctx) int VT = rD(ctx->opcode); int VA = rA(ctx->opcode); int VB = rB(ctx->opcode); - TCGv_i64 avrA = tcg_temp_new_i64(); - TCGv_i64 avrB = tcg_temp_new_i64(); + TCGv_i64 avr = tcg_temp_new_i64(); TCGv_i64 sh = tcg_temp_new_i64(); - TCGv_i64 shifted = tcg_temp_new_i64(); + TCGv_i64 carry = tcg_temp_new_i64(); TCGv_i64 tmp = tcg_temp_new_i64(); - /* Place bits 125-127 of vB in sh. */ - get_avr64(avrB, VB, false); - tcg_gen_andi_i64(sh, avrB, 0x07ULL); + /* Place bits 125-127 of vB in 'sh'. */ + get_avr64(avr, VB, false); + tcg_gen_andi_i64(sh, avr, 0x07ULL); /* - * Save lowest sh bits of higher doubleword element of vA in variable - * shifted and perform shift on higher doubleword. + * Save lowest 'sh' bits of higher doubleword element of vA in variable + * 'carry' and perform shift on higher doubleword. */ - get_avr64(avrA, VA, true); - tcg_gen_subfi_i64(tmp, 64, sh); - tcg_gen_shl_i64(shifted, avrA, tmp); - tcg_gen_andi_i64(shifted, shifted, 0xfe00000000000000ULL); - tcg_gen_shr_i64(avrA, avrA, sh); - set_avr64(VT, avrA, true); + get_avr64(avr, VA, true); + tcg_gen_subfi_i64(tmp, 32, sh); + tcg_gen_shli_i64(carry, avr, 32); + tcg_gen_shl_i64(carry, carry, tmp); + tcg_gen_shr_i64(avr, avr, sh); + set_avr64(VT, avr, true); /* * Perform shift on lower doubleword element of vA and replace highest - * sh bits with shifted. + * 'sh' bits with 'carry'. */ - get_avr64(avrA, VA, false); - tcg_gen_shr_i64(avrA, avrA, sh); - tcg_gen_or_i64(avrA, avrA, shifted); - set_avr64(VT, avrA, false); + get_avr64(avr, VA, false); + tcg_gen_shr_i64(avr, avr, sh); + tcg_gen_or_i64(avr, avr, carry); + set_avr64(VT, avr, false); - tcg_temp_free_i64(avrA); - tcg_temp_free_i64(avrB); + tcg_temp_free_i64(avr); tcg_temp_free_i64(sh); - tcg_temp_free_i64(shifted); + tcg_temp_free_i64(carry); tcg_temp_free_i64(tmp); }