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target/arm: Check NaN mode before silencing NaN

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If the CPU is running in default NaN mode (FPCR.DN == 1) and we execute
FRSQRTE, FRECPE, or FRECPX with a signaling NaN, parts_silence_nan_frac() will
assert due to fpst->default_nan_mode being set.

To avoid this, we check to see what NaN mode we're running in before we call
floatxx_silence_nan().

Signed-off-by: Joe Komlodi <joe.komlodi@xilinx.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 1624662174-175828-2-git-send-email-joe.komlodi@xilinx.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Joe Komlodi 2021-06-25 16:02:54 -07:00 committed by Peter Maydell
parent 95079d5c79
commit 103e7579dd
2 changed files with 27 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
target/arm/helper-a64.c
View File

@ -365,7 +365,9 @@ uint32_t HELPER(frecpx_f16)(uint32_t a, void *fpstp)
float16 nan = a;
if (float16_is_signaling_nan(a, fpst)) {
float_raise(float_flag_invalid, fpst);
nan = float16_silence_nan(a, fpst);
if (!fpst->default_nan_mode) {
nan = float16_silence_nan(a, fpst);
}
}
if (fpst->default_nan_mode) {
nan = float16_default_nan(fpst);
@ -396,7 +398,9 @@ float32 HELPER(frecpx_f32)(float32 a, void *fpstp)
float32 nan = a;
if (float32_is_signaling_nan(a, fpst)) {
float_raise(float_flag_invalid, fpst);
nan = float32_silence_nan(a, fpst);
if (!fpst->default_nan_mode) {
nan = float32_silence_nan(a, fpst);
}
}
if (fpst->default_nan_mode) {
nan = float32_default_nan(fpst);
@ -427,7 +431,9 @@ float64 HELPER(frecpx_f64)(float64 a, void *fpstp)
float64 nan = a;
if (float64_is_signaling_nan(a, fpst)) {
float_raise(float_flag_invalid, fpst);
nan = float64_silence_nan(a, fpst);
if (!fpst->default_nan_mode) {
nan = float64_silence_nan(a, fpst);
}
}
if (fpst->default_nan_mode) {
nan = float64_default_nan(fpst);

24
target/arm/vfp_helper.c
View File

@ -671,7 +671,9 @@ uint32_t HELPER(recpe_f16)(uint32_t input, void *fpstp)
float16 nan = f16;
if (float16_is_signaling_nan(f16, fpst)) {
float_raise(float_flag_invalid, fpst);
nan = float16_silence_nan(f16, fpst);
if (!fpst->default_nan_mode) {
nan = float16_silence_nan(f16, fpst);
}
}
if (fpst->default_nan_mode) {
nan = float16_default_nan(fpst);
@ -719,7 +721,9 @@ float32 HELPER(recpe_f32)(float32 input, void *fpstp)
float32 nan = f32;
if (float32_is_signaling_nan(f32, fpst)) {
float_raise(float_flag_invalid, fpst);
nan = float32_silence_nan(f32, fpst);
if (!fpst->default_nan_mode) {
nan = float32_silence_nan(f32, fpst);
}
}
if (fpst->default_nan_mode) {
nan = float32_default_nan(fpst);
@ -767,7 +771,9 @@ float64 HELPER(recpe_f64)(float64 input, void *fpstp)
float64 nan = f64;
if (float64_is_signaling_nan(f64, fpst)) {
float_raise(float_flag_invalid, fpst);
nan = float64_silence_nan(f64, fpst);
if (!fpst->default_nan_mode) {
nan = float64_silence_nan(f64, fpst);
}
}
if (fpst->default_nan_mode) {
nan = float64_default_nan(fpst);
@ -866,7 +872,9 @@ uint32_t HELPER(rsqrte_f16)(uint32_t input, void *fpstp)
float16 nan = f16;
if (float16_is_signaling_nan(f16, s)) {
float_raise(float_flag_invalid, s);
nan = float16_silence_nan(f16, s);
if (!s->default_nan_mode) {
nan = float16_silence_nan(f16, fpstp);
}
}
if (s->default_nan_mode) {
nan = float16_default_nan(s);
@ -910,7 +918,9 @@ float32 HELPER(rsqrte_f32)(float32 input, void *fpstp)
float32 nan = f32;
if (float32_is_signaling_nan(f32, s)) {
float_raise(float_flag_invalid, s);
nan = float32_silence_nan(f32, s);
if (!s->default_nan_mode) {
nan = float32_silence_nan(f32, fpstp);
}
}
if (s->default_nan_mode) {
nan = float32_default_nan(s);
@ -953,7 +963,9 @@ float64 HELPER(rsqrte_f64)(float64 input, void *fpstp)
float64 nan = f64;
if (float64_is_signaling_nan(f64, s)) {
float_raise(float_flag_invalid, s);
nan = float64_silence_nan(f64, s);
if (!s->default_nan_mode) {
nan = float64_silence_nan(f64, fpstp);
}
}
if (s->default_nan_mode) {
nan = float64_default_nan(s);